How do I display the name of the user who created the comment in Rails?

Question

ruby

In general, there are users comments and there are posts, how to register associations between models in order to show on the posts who wrote the comment?

Answer 1

class User < ActiveRecord::Base
  has_many :posts, dependent: :destroy
  has_many :comments, dependent: :destroy
end

class Post < ActiveRecord::Base
  belongs_to :user
  has_many :comments, dependent: :destroy
end

class Comment < ActiveRecord::Base
  belongs_to :user
  belongs_to :post
end

class PostsController < ApplicationController
  def index
    @posts = Post.includes(:user, :comments).order('created_at DESC')
  end
end

<% @posts.each do |post| %>
  <%= link_to post.user.user_name, user_path(post.user) %> #кто написал пост
  <% post.comments.each do |comment| %> #проходимся по комментам
    <%= comment.user.user_name%> # кто написал коммент
  <% end %>
<% end %>

As someone so, if you need comments / explanations, ask.