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# How to get just the comment routes, and not the post routes

resources :posts do
  resources :comments
end

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@posts = @profile.posts # []
@profile.posts.build
@posts # array containing a single post

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# config/initializers/devise.rb
config.mailer = DeviseMailer

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class Conversation < ActiveRecord::Base
  has_many :messages
  has_many :participants
  has_many :users, :through => :participants

  accepts_nested_attributes_for :messages
end

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<% if @post.errors.any? %>
    var errors = '';
  <% @comment.errors.full_messages.each do |error| %>
    errors.append("<%= escape_javascript( error ) %>\n");
  <% end %>
  alert(errors);
<% else %>
    $('#posts').prepend('<%=j render 'chapters/posts/post', {:post => @post} %>')
<% end %>

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<% if @post.errors.any? %>
    var errors = '';
  <% @comment.errors.full_messages.each do |error| %>
    errors.append("<%= escape_javascript( error ) %>\n");
  <% end %>
  alert(errors);
<% else %>
    $('#posts').prepend('<%=j render 'chapters/posts/post', {:post => @post} %>')
<% end %>