Ruby on Rails - nested associations - creating new records -

I am learning Rail (4.2 installed) and working on a social network simulation application. I have setup many relationships between the user and the post, and now I am trying to add comments on the posts too. After several attempts and ending with the following setup:

User Model

  has_many: post, dependent: deleted has_many: Comments, via:  

post model

  related_to: user has_many: comments    Comment Model  
 
  related_to: user  
 
 The comment post has been started from the show page, so < Strong> Post Controller : 
 
  def show @comment = co Mment.new end  
 
 The question now is:  Comments Controller , what is the correct way to create a new record? I tried down and many other people, but without success 
 
  def make @comment = current_user.posts.comment.new (comment_params) @ comment.save redirect_to users_path end   
 
 (from current_user devise Is) 
 
 Besides, how can I choose related posts for a comment? 
 
 Thanks 
 

You make a relationship on post Describe each comment , which is related to post . " In your case, you want to create a foreign key on comment , then every comment will be related_ one Specific post . So, you add related_to: post to your comment model.

Therefore, your models are created:

  class users & lt; ActiveRecord :: Base has has_many: posts, dependent :: deleted has_many: Comments, through :: Post the end posts of posts & lt; ActiveRecord :: Base is_to: User has_many: Comments and Class Comments & lt; ActiveRecord :: Base is_to: User is_to: post end  

Then, to create a comment , you would want to do one of two tasks in your controller: / P>

1. Load related to comment as you are making a parameter through the URI. Pass

2. Post in the form that calls to create method on comment Does.

I personally prefer to load posts from a parameter in the URI, because you have permission for authorization As far as possible, check it comment can be added to the post - for example

> method comments controller to create will look like this:

  def create @ post = post.find (post_id_param) # you Want authorization logic for "current_user a comment # Can post this ", and maybe" Is there any current user? "@comment = @ post.comments.build (comment_params) if @ comment.save redirect_to posts_path (@post) else # Display errors and return to comment @ Erres = @ comment. Errors Render: New End and Private Def post_id_param params.require (: Post_id) end def comment_params params.require (: comment) .permit (...) # Acceptable acceptable commentary at the end of the params  

< / Div>