在Rails中没有ID的情况下找不到帖子

Question

In show.html.erb

<%= form_for :comment, :url=> {:controller => 'comments', :action => 'create'} do |f| %>
<%= f.text_field :title %>
<%= f.text_area :comment %>
<%= f.hidden_field :id , :value => @post.id %>
<%= f.submit %>
<% end %>

in Comments_controller

class CommentsController < ApplicationController

def create
  @post = Post.find(params[:id])
  @comments = @post.comments.create(params[:comment])
  if @comments.save
    redirect_to @post
  else
    redirect_to post_path
  end
end

In Routes.rb resources :posts

match '/create',  :to => 'comments#create'  , :as => :create 

when i add any comment from view form it gives following error :

'Couldn't find Post without an ID'

i cant figure out why params[:id] not returning Post ID ? Note : I am using acts_as_commentable

Answer 1

Got the answer

comments_controller should be as

class CommentsController < ApplicationController

  def create
    @post = Post.find(params[:comment][:id])    
    @comments = @post.comments.create(params[:comment])
    if @comments.save
      redirect_to @post
    else
      redirect_to post_path
    end
  end
end

@post = Post.find(params[:comment][:id])

Answer 2

The reason your params[:id] not returning Post ID because in your routes.rb you choose url /create , in which you have not specified any placeholder for id .

if you want something like params[:id] then in your routes.rb you should write '/create/:id' in match mathod.