How do I make sure each post in the Post feed show

I have a Post model, and a Comment model that belongs to Post. I was able to display the Post in the home view corresponding to the home controller and home action and the User/show view. Thus, in the home and user views, the posts are listed in order of creation time. I was also able to have a post form in both the user and home views and a comment form in the home and user views.

The problem arises when I try to display the comment underneath each displayed Post in the home and user views. How can I list the comments associate with each post under the post in the home and user views ?

How do I make sure the comments in the databased are listed under the corresponding post ?

Here is my comments controller:

class CommentsController < ApplicationController
 def index
 @comments =Comment.all.paginate(page: params[:page])
  end
 def show
 @comment = Comment.find(params[:id])
 @post = @Comment.post
 end
 def new
 end
 def create
 @comment = Comment.new(comment_params)
  if @comment.save
  flash[:success] = "Comment created"
  redirect_to :back
  else
  render 'new'
  end
  end
  def edit
  @comment = Comment.find(params[:id])
  end
  def update
  @comment = comment.find(params[:id])
  if @comment.update_attributes(comment_params)
  flash[:success] = "Comment updated"
  redirect_to @comment.post
  else
  render 'edit'
  end
  end
  def destroy
    Comment.find(params[:id]).destroy
    flash[:success] = "Comment deleted"
    redirect_to users_url
  end  
  private
  def comment_params
  params.require(:comment).permit(:author_name, :body)
  end
  end

Here is my home view: app/views/home/home.html.erb:

<% if logged_in? %>
  <div class="row">
    <aside class="col-md-4">
    <section class="user_info">
      <%= render 'shared/user_info' %>
    </section>
    <hr/>
    <br/>
    <section class="stats">
      <%= render 'shared/stats' %>
    </section>
    <section class="post_form">
      <%= render 'shared/post_form' %>
      </section>
    </aside>
    <div class="col-md-8">
      <h3>Post Feed</h3>
      <%= render 'shared/feed' %>
    </div>
  </div>
<% else %>
  <div class="center jumbotron">
    <h1>Welcome to the Unstarv website</h1>
    <h2>
      Please sign up now to use this site
      <%= link_to "Sign Up",  signup_path =%> 
      now.
    </h2>
    <%= link_to "Sign up now!", signup_path, class: "btn btn-lg btn-primary" %>
  </div>
  <%= link_to image_tag("rails.png", alt: "unstarv logo"), '#' %>
<% end %>

And here is my home controller:

class HomeController < ApplicationController
  def home
    if logged_in?
      @post  = current_user.posts.build
      @feed_items = current_user.feed.paginate(page: params[:page])  
    end
  end

  def about
  end

  def privacy
  end

  def terms
  end
end

And here is my Post model, the relevant part:

class Post < ActiveRecord::Base
  belongs_to :user
  has_many :comments
  default_scope -> { order(created_at: :desc) }
  mount_uploader :picture, PictureUploader
end

The relevant part of my User model:

class User < ActiveRecord::Base
  attr_accessor :remember_token
  before_save { self.email = email.downcase }
  has_many :posts, dependent: :destroy
  has_many :comments
  has_many :active_relationships, class_name:  "Relationship",
    foreign_key: "follower_id",
    dependent:   :destroy
  has_many :passive_relationships, class_name:  "Relationship",
    foreign_key: "followed_id",
    dependent:   :destroy
  has_many :following, through: :active_relationships, source: :followed  
  has_many :followers, through: :passive_relationships, source: :follower
  validates :username,  presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, format: { with: VALID_EMAIL_REGEX },
    uniqueness: { case_sensitive: false }
  has_secure_password
  validates :password, length: { minimum: 6 }, allow_blank: true

  def feed
    following_ids = "SELECT followed_id FROM relationships WHERE  follower_id = :user_id"
    Post.where("user_id IN (#{following_ids}) OR user_id = :user_id", user_id: id)
  end
end

And here is my Comment model:

class Comment < ActiveRecord::Base
  belongs_to :post
  belongs_to :user
  default_scope -> { order(created_at: :desc) }  
end

And here is the post controller:

class PostsController < ApplicationController
  before_action :logged_in_user, only: [:create, :destroy]
  def index
    @posts = Post.all
  end
  def show
    @post = Post.find(params[:id])
    @comment = Comment.new
    @comment.post_id = @post.id
    @comments = @post.comments.all
  end
  def new
    @post = Post.new
  end
  def create
    @post = current_user.posts.build(post_params)
    if @post.save
      flash[:success] = "Post created!"
      redirect_to root_url
    else
      @feed_items = []
      render 'home/home'
    end
  end
  def edit
    @post = Post.find(params[:id])
  end
  def update
    @post = Post.find(params[:id])
    @post.update(post_params)
    flash.notice = "Post '#{@post.title}' Updated!"
    render 'home/home  '
  end

  def update
    @post = Post.find(params[:id])
    @post.update(post_params)
    flash.notice = "Post '#{@post.title}' Updated!"
    redirect_to root_url
  end

  private
  # Use callbacks to share common setup or constraints between actions.
  def set_post
    @post = Post.find(params[:id])
  end

  # Never trust parameters from the scary internet, only allow the white list through.
  def post_params
    params.require(:post).permit(:title, :body, :picture)
  end
end

Here is my app/views/post/_post.html.erb file,

<li id="post-<%= post.id %>">
  <span class="user"><%= link_to post.user.username, post.user %></span>
  <span class="content">
    <%= post.title %>
    <%= post.body %>
    <%= image_tag post.picture.url if post.picture? %>
  </span>
  <span class="timestamp">
    Posted <%= time_ago_in_words(post.created_at) %> ago.
    <% if current_user?(post.user) %>
    <%= link_to "delete", post, method: :delete,
        data: { confirm: "You sure?" } %>
        <% end %>
  </span>
  <section>
    <h2>Your Comments here</h2>
    <h3>Post a Comment</h3>
    <h3>Post a Comment</h3>
    <%= render 'shared/comment_form' %>
    <% post.comments.all.each do |comment| %>
    <h4><small>Comment by</small> <%= comment.post.user.username %></h4> 
    <p class="comment"><%= comment.body %></p>
    <p><small>Posted <%= distance_of_time_in_words(Time.now,     comment.created_at) %> ago</small></p>
    <br/>
    <%end%>
</li>

And here is my app/views/shared/comment_form_html.erb , which works fine:

<%= form_for [ post, post.comments.build] do |f| %>
  <p>
    <%= f.label :body, "Your Comment" %><br/>
    <%= f.text_area :body %>
  </p>
  <p>
    <%= f.submit 'Submit' .  method="post", class: 'btn btn-primary' %>
  </p>
<% end %>

Here is my app/views/posts/_post.html.erb

<li id="post-<%= post.id %>">
<span class="user"><%= link_to post.user.username, post.user %></span>
<span class="content">
<%= post.title %>
<%= post.body %>
<%= image_tag post.picture.url if post.picture? %>
</span>
<span class="timestamp">
Posted <%= time_ago_in_words(post.created_at) %> ago.
<% if current_user?(post.user) %>
 <%= link_to "delete", post, method: :delete,
                                   data: { confirm: "You sure?" } %>
<% end %>
</span>
<h2>Comments</h2>
<h3>Post a Comment</h3>
<%= render 'shared/comment_form', post: post %>       
<h3>Comments (<%= post.comments.size %>)</h3>
<% post.comments.each do |comment| %>
<h4><small>Comment by</small> <%= comment.post.user.username %></h4>
<p class="comment"><%= comment.body %></p>
<p>Posted <%= distance_of_time_in_words(Time.now, comment.created_at) %> ago</p>
</li>
<br/>
<%end%>

Thanks a lot for your help !!!!

The issue is related in how you are creating the comments.

With the actual code, the comment does not belong to any post so in your comments_controller change create action to something like:

def create
  post = Post.find(params[:post_id])
  @comment = post.comments.build(comment_params)
  if @comment.save
    flash[:success] = "Comment created"
    redirect_to :back
  else
    render 'new'
  end
end