Routing problems one-to-one association - ruby-on-rails

Question

I tried to route as following with my 2 models pimp and mepager (one-to-one relation):
/config/routes.rb
root :to => 'pimps#index'
get '/:pimp_id/mepager', :to => 'mepager#show', :as => 'mepager'
My mepager show action looks like this:
/app/controllers/mepagers_controller.rb
before_action :set_pimp
def show
#mepager = #pimp.mepager
end
private
def set_pimp
#pimp = Pimp.find(params[:pimp_id])
end
Now I tested in the rails console the function Pimp.first.mepager what should be equal to #pimp.mepager and it gives me the right mepager object back with all atttributes. But if I try to open '/:pimp_id/mepager' in my webapplication (with an existing pimp that has a mepager linked to it) I get following error
Routing Error
uninitialized constant MepagerController
Did I miss something?
Regards.
Complete error msg:
Started GET "/1/mepager" for 127.0.0.1 at 2014-06-06 08:55:20 +0200
ActionController::RoutingError (uninitialized constant
MepagerController): activesupport (4.0.0)
lib/active_support/inflector/methods.rb:226:in const_get'
activesupport (4.0.0) lib/active_support/inflector/methods.rb:226:in
block in constantize' activesupport (4.0.0)
lib/active_support/inflector/methods.rb:224:in each' activesupport
(4.0.0) lib/active_support/inflector/methods.rb:224:ininject'
activesupport (4.0.0) lib/active_support/inflector/methods.rb:224:in
constantize' actionpack (4.0.0)
lib/action_dispatch/routing/route_set.rb:76:incontroller_reference'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:66:in
controller' actionpack (4.0.0)
lib/action_dispatch/routing/route_set.rb:44:incall' actionpack
(4.0.0) lib/action_dispatch/journey/router.rb:71:in block in call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:ineach'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in call'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655:in
call' rack (1.5.2) lib/rack/etag.rb:23:in call' rack (1.5.2)
lib/rack/conditionalget.rb:25:incall' rack (1.5.2)
lib/rack/head.rb:11:in call' actionpack (4.0.0)
lib/action_dispatch/middleware/params_parser.rb:27:incall'
actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:in
call' rack (1.5.2) lib/rack/session/abstract/id.rb:225:incontext'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in call'
actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in
call' activerecord (4.0.0) lib/active_record/query_cache.rb:36:in
call' activerecord (4.0.0)
lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in
cal l' activerecord (4.0.0) lib/active_record/migration.rb:369:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/callbacks.rb:29:inblock in call'
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in
_run__226962734__call__callbacks' activesupport (4.0.0)
lib/active_support/callbacks.rb:80:inrun_callbacks' actionpack
(4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in call'
actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/remote_ip.rb:76:in call' actionpack
(4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in
call' actionpack (4.0.0)
lib/action_dispatch/middleware/show_exceptions.rb:30:in call'
railties (4.0.0) lib/rails/rack/logger.rb:38:incall_app' railties
(4.0.0) lib/rails/rack/logger.rb:21:in block in call' activesupport
(4.0.0) lib/active_support/tagged_logging.rb:67:inblock in tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in
tagged' activesupport (4.0.0)
lib/active_support/tagged_logging.rb:67:intagged' railties (4.0.0)
lib/rails/rack/logger.rb:21:in call' actionpack (4.0.0)
lib/action_dispatch/middleware/request_id.rb:21:incall' rack
(1.5.2) lib/rack/methodoverride.rb:21:in call' rack (1.5.2)
lib/rack/runtime.rb:17:incall' activesupport (4.0.0)
lib/active_support/cache/strategy/local_cache.rb:83:in call' rack
(1.5.2) lib/rack/lock.rb:17:incall' actionpack (4.0.0)
lib/action_dispatch/middleware/static.rb:64:in call' railties
(4.0.0) lib/rails/engine.rb:511:incall' railties (4.0.0)
lib/rails/application.rb:97:in call' rack (1.5.2)
lib/rack/lock.rb:17:incall' rack (1.5.2)
lib/rack/content_length.rb:14:in call' rack (1.5.2)
lib/rack/handler/webrick.rb:60:inservice'
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'
Rendered
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-4.0.0/lib/action_dispatch
/middleware/templates/rescues/_trace.erb (1.0ms) Rendered
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-4.0.0/lib/action_dispatch
/middleware/templates/routes/_route.html.erb (1.0ms) Rendered
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-4.0.0/lib/action_dispatch
/middleware/templates/routes/_table.html.erb (1.0ms) Rendered
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/actionpack-4.0.0/lib/action_dispatch
/middleware/templates/rescues/routing_error.erb within rescues/layout
(42.0ms)
Console test
> irb(main):001:0> Pimp.first.mepager ←[1m←[36mSQL (0.0ms)←[0m
> ←[1mUSE [rails_confreport_develop]←[0m ←[1m←[35mPimp Load
> (1.0ms)←[0m EXEC sp_executesql N'SELECT TOP (1) [pimps].* Y
> [pimps].[id] ASC' ←[1m←[36mMepager Load (1.0ms)←[0m ←[1mEXEC
> sp_executesql N'SELECT TOP (1) [me gers] WHERE [mepagers].[pimp_id] =
> #0 ORDER BY [mepagers].[id] ASC', N'#0 int', id", 2]]
> => #<Mepager id: 2, pimp_id: 2, pre: "geqgewqrgq", post: "egewqewqgewqgewq", com .0, save_c: nil, save_other: "", save_otherv:
> nil, affect_design: "", affect_str "", affect_other: "", affect_dno:
> "", affect_mid: "", affect_otherdoc: "", owner ence: "", created_at:
> "2014-06-06 06:36:44", updated_at: "2014-06-06 06:36:44">
mepagers_controller.rb
class MepagersController < ApplicationController
before_action :set_mepager, only: [:show, :edit, :update, :destroy]
before_action :set_pimp
# GET /mepagers
# GET /mepagers.json
#def index
##mepagers = Mepager.all
#end
# GET /mepagers/1
# GET /mepagers/1.json
def show
#mepager = #pimp.mepager
end
# GET /mepagers/new
def new
#mepager = #pimp.build_mepager
end
# GET /mepagers/1/edit
def edit
#mepager = #pimp.mepager
end
# POST /mepagers
# POST /mepagers.json
def create
#mepager = #pimp.build_mepager(mepager_params)
respond_to do |format|
if #mepager.save
format.html { redirect_to [#pimp,#mepager], notice: 'Mepager was successfully created.' }
format.json { render action: 'show', status: :created, location: #mepager }
else
format.html { render action: 'new' }
format.json { render json: #mepager.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /mepagers/1
# PATCH/PUT /mepagers/1.json
def update
#mepager = #pimp.mepager
respond_to do |format|
if #mepager.update(mepager_params)
format.html { redirect_to [#pimp,#mepager], notice: 'Mepager was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #mepager.errors, status: :unprocessable_entity }
end
end
end
# DELETE /mepagers/1
# DELETE /mepagers/1.json
def destroy
#mepager = #pimp.mepager
#mepager.destroy
respond_to do |format|
format.html { redirect_to mepagers_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_mepager
#mepager = Mepager.find(params[:id])
end
def set_pimp
#pimp = Pimp.find(params[:pimp_id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def mepager_params
params.require(:mepager).permit(:pimp_id, :pre, :post, :comment, :save_h, :save_c, :save_other, :save_otherv, :affect_design, :affect_stress, :affect_me, :affect_other, :affect_dno, :affect_mid, :affect_otherdoc, :owner, :pps, :reference)
end
end

Answer 1

You have written get '/:pimp_id/mepager', :to => 'mepager#show', :as => 'mepager' but it should be get '/:pimp_id/mepager', :to => 'mepagers#show', :as => 'mepager'. You forgot to add "s" in your "mepages#show". For more information refer to here.
One more thing since your mepager is nested inside pimp you don't need your :set_mepager filter. You can either remove it or do something like this inside your mepagers_controller.rb
class MepagersController < ApplicationController
before_action :set_pimp
before_action :set_mepager, only: [:show, :edit, :update, :destroy]
# your actions
private
# Use callbacks to share common setup or constraints between actions.
def set_mepager
#mepager = #pimp.mepager
end
def set_pimp
#pimp = Pimp.find(params[:pimp_id])
end
end

Answer 2

You need to modify your routes this way:
root :to => 'pimps#index'
get '/:pimp_id/mepager', :to => 'mepagers#show', :as => 'mepager'
Rails infers the controller name from the :to keyword. The notation mepagers#show means the show method of MepagersController
Source: http://edgeguides.rubyonrails.org/routing.html#connecting-urls-to-code