Rails has_many在单独的表单/视图中嵌套了属性

Question

I found plenty of example on how to construct a multi-model form and multi-model display. But what if I want to have separate forms and displays?

post.rb:

class Post < ActiveRecord::Bas
  has_many :comments, dependent: :destroy
  attr_accessible :comments_attributes
  accepts_nested_attributes_for :comments
end

comment.rb:

class Comment < ActiveRecord::Base
  belongs_to :post
end

posts_controller.rb:

def new
  @post = Post.new
  @post.comments.build
  ...
end

routes.db:

resources posts do
  resources comments
end

I have a link to post comments index in my post index:

views/posts/index.html.erb:

...
<%= link_to 'Comments', post_comments_path(post) %>
...

Post and Comment each have their own scaffold generated form (not nested).

<%= form_for(@post) do |f| %>
...

<%= form_for(@comment) do |f| %>
...

In the comments index I loop over post comments:

views/comments/index.html.erb:

<% @post = Post.find(params[:post_id]) %>  //works fine  
<% @post.comments.each do |comment| %>
...
<% end %>

Yet after adding a new comment (under a specific post id) the table in the post comments index is empty!

Please help. Thanks :)

Answer 1

I figured it out.

In the comments forms it should be:

<%= form_for([@post, @comment]) do |f| %>
...

Paths should be used like:

post_comments_path(@post)
edit_post_comment_path(@post,@comment)

etc.

In the Comments controller:

def index
    @post= Post.find(params[:post_id])
    @comments= @post.comments.all
...

def show
    @post= Post.find(params[:post_id])
    @comment= @post.comments.find(params[:id])
...

etc.

Hope others will find this useful!