The action 'update' could not be found for InfosController - ruby-on-rails

Question

So I have a site that I'm trying to make, in which you can enter a title and a price for a object called Info. When I enter in the title and price and press submit, the page that it gets redirected to says "The action 'update' could not be found for InfosController". I want it to flash a message notifying the user that the object was created successfully. Any Help??
controllers/infos_controller.rb
class InfosController < ApplicationController
def index
#info = Info.new
end
def create
#info = Info.new(params[:info])
if #info.save
flash[:notice] = 'Object created successfully, thank you'
render :index
else
flash[:notice] = 'Sorry! Object was not created successfully'
render :new
end
end
def update
#info = Info.find(params[:id])
if #info.update_attributes(params[:info])
# if update is successful
else
# if update is unsuccessful
end
redirect_to infos_path
end
end
views/infos/index.html.erb
<h1>Please enter information about an Info object</h1>
<%= form_for #info, url: {action: "create"} do |f| %>
<%= f.label :title %><br />
<%= f.text_field :title %> <br />
<%= f.label :price %><br />
<%= f.text_field :price %> <br />
<%= f.submit "Submit" %> <br />
<% end %>
models/info.rb
class Info < ActiveRecord::Base
attr_accessible :price, :title
end
New error
ActiveRecord::RecordNotFound in InfosController#update
Couldn't find Info with id=create
Rails.root: C:/Sites/2/information
Application Trace | Framework Trace | Full Trace
app/controllers/infos_controller.rb:18:in `update'
Request
Parameters:
{"utf8"=>"✓",
"_method"=>"put",
"authenticity_token"=>"aXaLYDb5yhl2NXNriOf9gub2JcArrkUOdBogX4kcfKA=",
"info"=>{"title"=>"strawberries",
"price"=>".89"},
"commit"=>"Submit",
"id"=>"create"}
also, here is views\infos\create.html.erb
<h1>Infos#create</h1>
<p>Find me in app/views/infos/create.html.erb</p>
<h2><% if flash[:notice] %> <%= flash[:notice] %></h2>

Answer 1

If you've posted your InfosController in its entirety, you're missing the update action. Add it akin to as follows:
# app/controllers/infos_controller.rb
def update
#info = Info.find(params[:id])
if #info.update_attributes(params[:info])
# if update is successful
else
# if update is unsuccessful
end
redirect_to infos_path
end
UPDATE:
The likely reason why you're not hitting the create action is because your form is submitting to a path that matches the update path, rather than the create path.
First, if you have implemented RESTful routes for your infos resource (as you indicated you have), you shouldn't need to explicitly declare get "infos/create" as you have – the create route is implicitly created in your resourceful route declaration.
Then, if you indeed want a form_for helper to POST to your create action, try passing a hash to the url key in your form_for declaration:
<%= form_for #info, url: {action: "create"} do |f| %>
UPDATE 2:
The reason you are not hitting your update action is that the path you're posting your form to is /infos/create, when according to the canonical Rails guides, you should be posting to /infos. You can resolve this simply be removing the url argument in your form_for declaration:
<%= form_for #info do |f| %>
By default, Rails knows to route a form_for submission for a new object to the corresponding create action of the controller.
The reason why you're hitting the update action is that Rails takes the path you're currently submitting to, e.g. /infos/create, and routes to the update action with a params[:id] of create (rather than a numerical id). To properly invoke the update action, you should pass an existing Info object (for instance, Info.first) to your form_for helper. This will automatically route your submission to the update action:
# app/controllers/infos_controller.rb
def edit
#info = Info.find(params[:id]) # let's assume the id == 42
end
# app/views/infos/edit.html.erb
<%= form_for #info do |f| %>
Because you're passing an existing Info object, this form_for helper will automatically POST the request to the path /infos/42. Because the HTTP request method is POST, the request will automatically be routed to the update action, where params[:id] will equal 42 in the example above.
get "infos/create" should be dropped from routes.rb entirely, since the create route is already implicitly created in your resources :infos declaration.