Error 422 (Unprocessable Entity) while making Ajax call on Rails Controller - ruby-on-rails

Here is my code:
class EventController < ApplicationController
def update
render :json => { :status => :ok, :message => 'Good Morning'}
end
end
and this is my route entry:
post 'event/update', controller:'event', action: :update
Error Message
<header>
<h1>
ActionController::InvalidAuthenticityToken
in EventController#update
</h1>
</header>
<div id="container">
<h2>ActionController::InvalidAuthenticityToken</h2>
Rails.root: /Clients/M/Application/HITS
Framework Trace
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:176:in `handle_unverified_request'
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:202:in `handle_unverified_request'
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:197:in `verify_authenticity_token'
activesupport (4.1.4) lib/active_support/callbacks.rb:424:in `block in make_lambda'
activesupport (4.1.4) lib/active_support/callbacks.rb:160:in `call'
activesupport (4.1.4) lib/active_support/callbacks.rb:160:in `block in halting'
activesupport (4.1.4) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.4) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.4) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.4) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.4) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.4) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:678:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.4) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.4) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.4) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.4) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.4) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.4) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.4) lib/rails/engine.rb:514:in `call'
railties (4.1.4) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
Full Trace
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:176:in `handle_unverified_request'
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:202:in `handle_unverified_request'
actionpack (4.1.4) lib/action_controller/metal/request_forgery_protection.rb:197:in `verify_authenticity_token'
activesupport (4.1.4) lib/active_support/callbacks.rb:424:in `block in make_lambda'
activesupport (4.1.4) lib/active_support/callbacks.rb:160:in `call'
activesupport (4.1.4) lib/active_support/callbacks.rb:160:in `block in halting'
activesupport (4.1.4) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.4) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.4) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.4) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.4) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.4) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.4) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:678:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.4) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.4) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.4) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.4) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.4) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.4) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.4) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.4) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.4) lib/rails/engine.rb:514:in `call'
railties (4.1.4) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
/Users/JD/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'
Request parameters
{"name"=>"John",
"time"=>"2pm"}
Session dump
_csrf_token: "a4y1SDHaXHRkiyIW8AncOYcPgRiO5syFXihKc5qqZlg="
session_id: "0d860d9a22ba027b92fcfa2ec5055965"
Env dump
GATEWAY_INTERFACE: "CGI/1.1"
HTTP_ACCEPT: "*/*"
HTTP_ACCEPT_ENCODING: "gzip,deflate"
HTTP_ACCEPT_LANGUAGE: "en-US,en;q=0.8,ur;q=0.6"
HTTP_CACHE_CONTROL: "no-cache"
HTTP_PRAGMA: "no-cache"
REMOTE_ADDR: "127.0.0.1"
REMOTE_HOST: "127.0.0.1"
SERVER_NAME: "0.0.0.0"
SERVER_PROTOCOL: "HTTP/1.1"
Response headers
None
</div>


I sorted it out by adding protect_from_forgery which does what authenticity_token in form does.
class EventController < ApplicationController
protect_from_forgery
def list
end
def details
end
def update
render :json => { :status => :ok, :message => 'Good Morning'}
end
end


This error is related to cross-site request forgery protection . Rails inserts an authenticity_token input inside your form to protect you against it. Run your application and then using Dev Tools (ex Chrome Dev Tools) inspect the page and verify that your form has the following input: (Note that the value attribute will be different)
<input name="authenticity_token" type="hidden" value="f755bb0ed134b76c432144748a6d4b7a7ddf2b71" />
Also make sure you are using POST method to send the form

Related

Want to decode QR image using 'qrio', but got this error

error:
incompatible character encodings: UTF-8 and ASCII-8BIT
Extracted source (around line #48):
def decoder
session[:qr] = puts Qrio::Qr.load("public/qrpic/qr1.png").qr.text
redirect_to equipment_search_path
end
I already tried .force_encoding("ISO-8859-1").encode("UTF-8") but error still occurs. any suggestion?
image:screen capture
FullTrace :
qrio (0.0.1) lib/qrio/qr_matrix.rb:212:in `join'
qrio (0.0.1) lib/qrio/qr_matrix.rb:212:in `text'
app/controllers/equipment_controller.rb:48:in `decoder'
actionpack (4.1.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.8) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.8) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.8) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.8) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:73:in `block in call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:678:in `call'
warden (1.2.6) lib/warden/manager.rb:35:in `block in call'
warden (1.2.6) lib/warden/manager.rb:34:in `catch'
warden (1.2.6) lib/warden/manager.rb:34:in `call'
rack (1.5.5) lib/rack/etag.rb:23:in `call'
rack (1.5.5) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.5) lib/rack/head.rb:11:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.5) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.5) lib/rack/session/abstract/id.rb:220:in `call'
app/middlewares/flash_session_cookie_middleware.rb:16:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.8) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.8) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.8) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.5) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.8) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.5) lib/rack/lock.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/static.rb:84:in `call'
rack (1.5.5) lib/rack/sendfile.rb:112:in `call'
railties (4.1.8) lib/rails/engine.rb:514:in `call'
railties (4.1.8) lib/rails/application.rb:144:in `call'
rack (1.5.5) lib/rack/lock.rb:17:in `call'
rack (1.5.5) lib/rack/content_length.rb:14:in `call'
rack (1.5.5) lib/rack/handler/webrick.rb:60:in `service'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
Here is the "FullTrace" that I got,any suggestion?

undefined method `[]' for nil:NilClass on mandrill mailer

I'm trying to use the mandrill_mailer gem to control transactional email, though it's returning a undefined method [] for nil:NilClass error and highlights a line in my mailer, even if I remove this line and most of the others the problem seems to persist.
mailers/panel_mailer.rb
class PanelMailer < MandrillMailer::TemplateMailer
def blast(user, template)
humans = user.humans
mandrill_mail(
template: 'blast-1',
subject: template.subject,
to: [
{ email: "callum#hotmail.com", name: "Callum Short" }
],
vars: {
'BG_COLOUR' => "##{user.bghex}",
'LOGO' => user.logourl_url
},
template_content: {'body' => template.body},
inline_css: true,
preserve_recipients: true,
recipient_vars: {"callum#hotmail.com" => {'FULL_NAME' => "Callum Short"}}
)
end
end
Full Trace:
mandrill_mailer (0.5.1) lib/mandrill_mailer/template_mailer.rb:171:in `mandrill_mail'
mandrill_mailer (0.5.1) lib/mandrill_mailer/core_mailer.rb:278:in `call'
mandrill_mailer (0.5.1) lib/mandrill_mailer/core_mailer.rb:278:in `method_missing'
actionpack (4.1.8) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.8) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.8) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.8) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.8) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.8) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.8) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.8) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.8) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.8) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.8) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.8) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:73:in `block in call'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.8) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.8) lib/action_dispatch/routing/route_set.rb:678:in `call'
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.8) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.8) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.8) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.8) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.8) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.8) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.8) lib/action_dispatch/middleware/static.rb:84:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.8) lib/rails/engine.rb:514:in `call'
railties (4.1.8) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

Log into mailchimp, go to templates, select your template and select "send to mandrill"
The error will go away :)
I will do an episode in the near future on this on http://rby.io/r/5509d6

Since are using url helpers inside mailer you should define default_url_options as a hash and specify :host option as well in development.rb or production.rb (they might differ):
config.mandrill_mailer.default_url_options = { host: 'localhost:3000' }
The error is thrown because default_url_options are nil while url helper is trying :[] method to fetch some properties.
method_missing which appears in error trace is just MandrillMailer's way to get access to Rails url helpers.

Undefined Method "apply_finder_options"

I have an undefined method error 'apply_finder_options'
_question.html.erb and where the error says it is
def self.unsolved(params)
where(solved: false).paginate(page: params[:page], order: 'created_at DESC', per_page: 3)
end
def self.search(params)
Questions Controller
def show
puts params
#question = Question.find(params[:id])
#answer = Answer.new
end
Full Error Stack Trace
activerecord (4.1.2) lib/active_record/relation/delegation.rb:136:in `method_missing'
activerecord (4.1.2) lib/active_record/relation/delegation.rb:99:in `method_missing'
will_paginate (3.0.7) lib/will_paginate/active_record.rb:168:in `paginate'
app/models/question.rb:12:in `unsolved'
app/controllers/questions_controller.rb:6:in `index'
actionpack (4.1.2) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.2) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.2) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.2) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.2) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:149:in `block in halting_and_conditional'
activesupport (4.1.2) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.2) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.2) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.2) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.2) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.2) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.2) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.2) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.2) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.2) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.2) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.2) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.2) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.2) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.1.2) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.2) lib/action_controller/metal.rb:232:in `block in action'
actionpack (4.1.2) lib/action_dispatch/routing/route_set.rb:82:in `call'
actionpack (4.1.2) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
actionpack (4.1.2) lib/action_dispatch/routing/route_set.rb:50:in `call'
actionpack (4.1.2) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.2) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.2) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.2) lib/action_dispatch/routing/route_set.rb:678:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.2) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.2) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.2) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.2) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.2) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.2) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.2) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.2) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.2) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.2) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.2) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.2) lib/rails/engine.rb:514:in `call'
railties (4.1.2) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'

Try changing your unsolved method to like this
def self.unsolved(params)
order('created_at DESC').where(solved: false).paginate(page: params[:page],per_page: 3)
end
Source

uninitialized constant User::LinkedinConnection

I am trying to implement login using linkedin , in the user model i have the following method:
def connect_to_linkedin (auth)
self.provider=auth.provider
self.uid=auth.uid
self.user_linkedin_connection = User::LinkedinConnection.new(:token => auth["extra"]["access_token"].token, :secret => auth["extra"]["access_token"].secret)
unless self.save
return false
end
true
end
but I got this error:"uninitialized constant User::LinkedinConnection"
and here is the framework trace:
actionpack (4.1.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.1) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.1) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.1) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.1) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.1) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.1) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.1) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.1.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.1) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.1.1) lib/action_dispatch/routing/mapper.rb:45:in `call'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:676:in `call'
omniauth (1.2.1) lib/omniauth/strategy.rb:404:in `call_app!'
omniauth (1.2.1) lib/omniauth/strategy.rb:362:in `callback_phase'
omniauth-oauth (1.0.1) lib/omniauth/strategies/oauth.rb:58:in `callback_phase'
omniauth (1.2.1) lib/omniauth/strategy.rb:227:in `callback_call'
omniauth (1.2.1) lib/omniauth/strategy.rb:184:in `call!'
omniauth (1.2.1) lib/omniauth/strategy.rb:164:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.1) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.1) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.1) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.1) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.1) lib/rails/engine.rb:514:in `call'
railties (4.1.1) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
C:/Ruby200-x64/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
C:/Ruby200-x64/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
C:/Ruby200-x64/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
any ideas about what should be done ?????

This means that that class is not available. Make sure it's required.

rails: undefined method `encoding' for #<ActionDispatch::Http::UploadedFile:xxxxxxxx>

Could someone please help me debug this error I get when trying to submit a file upload in rails?
NoMethodError in NationsController#create
undefined method `encoding' for #<ActionDispatch::Http::UploadedFile:0x2d475c8>
Environment:
Windows 7 (64bit)
ruby -v =
ruby 2.0.0p353 (2013-11-22) [i386-mingw32]
rails -v =
DL is deprecated, please use Fiddle
Rails 4.1.1
Files:
nations/new.erb:
<%= form_for :nation, url: nations_path do |f| %>
...
<p>
<%= f.label :Upload_flag %>
<%= f.file_field :flag %>
</p>
<p>
<%= f.submit :Post %>
</p>
<% end %>
nations_controller.rb:
def create
#nation = Nation.new(nation_params)
if #nation.save
redirect_to #nation
else
render 'new'
end
private
def nation_params
params.require(:nation).permit(:name, :ruler, :government, :description, :flag)
end
end
The code line that is highlighted as containing the error is:
#nation = Nation.new(nation_params)
Full trace and request:
activerecord (4.1.1) lib/active_record/connection_adapters/sqlite3_adapter.rb:47:in `binary_to_string'
activerecord (4.1.1) lib/active_record/connection_adapters/column.rb:105:in `type_cast'
activerecord (4.1.1) lib/active_record/attribute_methods/dirty.rb:102:in `_field_changed?'
activerecord (4.1.1) lib/active_record/attribute_methods/dirty.rb:78:in `save_changed_attribute'
activerecord (4.1.1) lib/active_record/attribute_methods/dirty.rb:66:in `write_attribute'
activerecord (4.1.1) lib/active_record/attribute_methods.rb:47:in `__temp__66c61676'
activerecord (4.1.1) lib/active_record/attribute_assignment.rb:45:in `public_send'
activerecord (4.1.1) lib/active_record/attribute_assignment.rb:45:in `_assign_attribute'
activerecord (4.1.1) lib/active_record/attribute_assignment.rb:32:in `block in assign_attributes'
activerecord (4.1.1) lib/active_record/attribute_assignment.rb:26:in `each'
activerecord (4.1.1) lib/active_record/attribute_assignment.rb:26:in `assign_attributes'
activerecord (4.1.1) lib/active_record/core.rb:452:in `init_attributes'
activerecord (4.1.1) lib/active_record/core.rb:198:in `initialize'
activerecord (4.1.1) lib/active_record/inheritance.rb:30:in `new'
activerecord (4.1.1) lib/active_record/inheritance.rb:30:in `new'
app/controllers/nations_controller.rb:21:in `create'
actionpack (4.1.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.1.1) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.1.1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.1.1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:113:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:229:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:166:in `block in halting'
activesupport (4.1.1) lib/active_support/callbacks.rb:86:in `call'
activesupport (4.1.1) lib/active_support/callbacks.rb:86:in `run_callbacks'
actionpack (4.1.1) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.1.1) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.1.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.1.1) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.1.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.1.1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.1.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.1.1) lib/abstract_controller/base.rb:136:in `process'
actionview (4.1.1) lib/action_view/rendering.rb:30:in `process'
actionpack (4.1.1) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.1.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.1.1) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.1.1) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.1.1) lib/action_dispatch/routing/route_set.rb:676:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/flash.rb:254:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.1.1) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.1.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
activerecord (4.1.1) lib/active_record/migration.rb:380:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.1.1) lib/active_support/callbacks.rb:82:in `run_callbacks'
actionpack (4.1.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.1.1) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.1.1) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.1.1) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
activesupport (4.1.1) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.1.1) lib/action_dispatch/middleware/static.rb:64:in `call'
rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
railties (4.1.1) lib/rails/engine.rb:514:in `call'
railties (4.1.1) lib/rails/application.rb:144:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
C:/Ruby200/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
C:/Ruby200/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
C:/Ruby200/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"78m9sOtlwoTKfAUdysKZoLiDHU4ikX/cVs8epIbEuag=",
"nation"=>{"name"=>"sdfsf",
"ruler"=>"sdfsdf",
"government"=>"green",
"description"=>"sdfsdfsdf",
"flag"=>#<ActionDispatch::Http::UploadedFile:0x2dcc5a0 #tempfile=#<Tempfile:C:/Users/JFR/AppData/Local/Temp/RackMultipart20140624-5808-bnuxjh>,
#original_filename="cane2008.png",
#content_type="image/png",
#headers="Content-Disposition: form-data; name=\"nation[flag]\"; filename=\"cane2008.png\"\r\nContent-Type: image/png\r\n">},
"commit"=>"Post"}
Toggle session dump
_csrf_token: "78m9sOtlwoTKfAUdysKZoLiDHU4ikX/cVs8epIbEuag="
session_id: "e874179e9713d0a2009b5908423f7290"
Toggle env dump
GATEWAY_INTERFACE: "CGI/1.1"
HTTP_ACCEPT: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
HTTP_ACCEPT_ENCODING: "gzip, deflate"
HTTP_ACCEPT_LANGUAGE: "it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3"
HTTP_CACHE_CONTROL: "max-age=0"
REMOTE_ADDR: "127.0.0.1"
REMOTE_HOST: "127.0.0.1"
SERVER_NAME: "localhost"
SERVER_PROTOCOL: "HTTP/1.1"
Response
Headers:
None
As explained at http://guides.rubyonrails.org/form_helpers.html#uploading-files there is no need to set form's encoding to "multipart/form-data" when using form_for (as opposed to using form_tag).
What can it be then? I fear that I'm experiencing some incompatibilities issues between ruby and rails version? Any quick fix? Thanks.

You cannot assign a file object to a binary column and save it. If you really want to just save the file's contents to the database, call read on it before assigning it to your model. You probably want to do something more suited for file uploads, though. Take a look at CarrierWave and Paperclip

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