Question

When I create a comment in my feed, rails is duplicating all the previous comments.

Comments Contoller

def create
  @post = Post.find(params[:post_id])
  @comment = @post.comments.create(params[:comment])
  redirect_to post_path(@post)
end

Posts Show

<div class="content">
<%= markdown(@post.content) %>

<ul class="comments">
<% @post.comments.each do |comment| %>
    <%= render @post.comments %>
<% end %>
</ul>

<%= render "comments/form" %>
</div>

_comment.html.erb

<li>
<%= link_to comment.name, comment.url, :title => "visit website", :target => "_blank", :rel => "nofollow" %>
<p><%= comment.body %></p>
<time><%= comment.created_at.utc.strftime("%m.%d.%Y") %></time>

<%= link_to 'X', [comment.post, comment],
                :confirm => 'Are you sure?',
                :method => :delete %>
</li>

Post.rb

has_many :comments, :dependent => :destroy

Comment.rb

belongs_to :post

After I create first comment

After I create first comment

Answer 1

from your code:

<% @post.comments.each do |comment| %>
    <%= render @post.comments %>
<% end %>

this should either be:

<%= render @post.comments %>

or:

<% @post.comments.each do |comment| %>
    <%= render comment %>
<% end %>