Rails: multi level nested Forms (accepts nested attributes)

Question

I am creating simple blog level application. below are my models. ``` class User < ActiveRecord::Base attr_accessible :name,:posts_count,:posts_attributes , :comments_attributes has_many :posts has_many :comments accepts_nested_attributes_for :posts , :reject_if => proc{|post| post['name'].blank?} , :allow_destroy => true end class Post < ActiveRecord::Base attr_accessible :name, :user_id ,:comments_attributes belongs_to :user has_many :comments accepts_nested_attributes_for :comments end class Comment < ActiveRecord::Base attr_accessible :content, :post_id, :user_id belongs_to :user belongs_to :post end ``` I am trying to create user,post and comment in one form by using `accepts_nested_attributes_for` feature of rails. Below is my controller and view code. Controller----------- ``` class UsersController < ApplicationController def new @user = User.new @post = @user.posts.build @post.comments.build end def create @user = User.new(params[:user]) @user.save end end ``` Form---------- `…

Accepted Answer

You will have to explicitly assign user_id for comments! You are nesting comments under posts, so comments would be having post_id assigned by default but though you are nesting comments under user form indirectly, there is no direct nesting of comments under user, so user_id remains blank in comments.

Try writing after create callback in Comment model to set user_id

In comment.rb

```
after_create{|comment|
  comment.user_id = post.user_id
  comment.save
}
```

Hope this helps :)

Rails: multi level nested Forms (accepts nested attributes)

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