使用Rails 4找不到没有ID的帖子

Question

guys i am suffering from a problem from last two days and i dont know whats going wrong with my code. I have two model with the name of 'post' and 'descrip'. Descrip belongs_to post as post has_one descrip. So when i submit form for post then next form appear which is for descrip.I descrip form i have one hidden field to pass post_id. But when i submit descrip form an error appear that "POST can't be find without an id". Here below my code as in view

<%= form_for :descrip, url:{action: "create", :controller => "descriptions"} do |f| %>
  <li>
    <%= f.label 'Detail' %><br>
    <%= f.text_field :detail %>
  </li>
  <li>
    <%= f.hidden_field :post_id , :value => @post.id %>
  </li>
  <li>
    <%= f.submit %>
  </li>
<% end %>

In Descriptions_controller

def new
  @descrip = Descrip.new
end

def create
  @post = Post.find(params[:descrip][:post_id])
  @descrip = @post.descrips.build(descrip_params)
  if @descrip.save
    render @post
  else
    render 'new'
  end
end

model of post and descrip

 class Post < ActiveRecord::Base
   has_one :descrip, :dependent => :destroy
 end

 class Descrip < ActiveRecord::Base
   belongs_to :post
 end

resources.rb

resources :descriptions
get "descriptions/new", :to => "descriptions#new", as: :descriptions_new
post "descriptions/create/:id", :to => "descriptions#create", as::descriptions_create

resources :posts do
  resources :descriptions
end

Kindly suggest me what i should do.How i can solve my error and how i can get post_id in my decrips table.Please.

Answer 1

It seems like there are two possibilities.

1) Firstly, it could be that your params are not what you think they are and plugging in an invalid number for Post.find() . Could you share what your params looks like?

2) If that's not the case you could be calling id on a post that isn't yet saved and therefore can't be found by ActiveRecord within your database. If you're submitting this form along with a form to create a post, you're likely saving the description first. Make sure your post either exists in the database or is saved before the description to fix this.

Out of curiosity is there any reason you've made description a separate table from post? It seems like you could save yourself a lot of trouble just having it be a text column within the posts table.

Answer 2

in your action add logger.info :

def create
 logger.info "---params ==> #{params.inspect}---"
 @post = Post.find(params[:descrip][:post_id])
 @descrip = @post.descrips.build(descrip_params)
 if @descrip.save
  render @post
 else
 render 'new'
end

end

run the application then in log/development.rb file you can view the all params value. if params or not passing try with <%= hidden_field_tag 'descrip[post_id]', @post.id %>