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app_controllers_replies_controllers.rb

######  Original code

class RepliesController < ApplicationController
  before_filter :signed_in_user, only: [:create, :edit]
  #before_filter :correct_user,   only: [:edit]

  def new
  	@reply = conversation.replies.build
  end

  def create
  	@reply = conversation.replies.build(params[:reply], user_id: current_user.id)
  	if @reply.save
  	  	flash[:success] = "Post created!"
  	  	redirect_to root_url
  	else
  		redirect_to root_url
  	end
  end

private

	def signed_in_user
      unless signed_in?
        store_location
        redirect_to signin_url, notice: "Please sign in."
      end
  end

  def correct_user
      @reply = current_user.replies.find_by_id(params[:id])
      redirect_to root_url if @conversation.nil?
  end
end


####### Updated Code

class RepliesController < ApplicationController
  before_filter :signed_in_user, only: [:create, :edit]
  #before_filter :correct_user,   only: [:edit]

  def new
  	@reply = conversation.replies.build
  end

  def create
  	@reply = conversation.replies.build(params[:reply], user_id: current_user.id)
  	if @reply.save
  	  	flash[:success] = "Post created!"
  	  	redirect_to root_url
  	else
  		redirect_to root_url
  	end
  end

private

	def signed_in_user
      unless signed_in?
        store_location
        redirect_to signin_url, notice: "Please sign in."
      end
  end

  def correct_user
      @reply = current_user.replies.find_by_id(params[:id])
      redirect_to root_url if @conversation.nil?
  end

  def conversation
    @conversation ||= Conversation.find(params[:conversation_id])
  end
end

app_views_conversations_show.html.erb

<!-- Original -->
<% provide(:title, @conversation.subject) %>
<%= render 'conversation_init' %>

<%= form_for(@reply) do |f| %>
	<%= render 'shared/reply_form', f: f %>
	<%= f.submit "Reply", class: "btn btn-large btn-primary" %>
<% end %>

<!-- Updated -->
<% provide(:title, @conversation.subject) %>
<%= render 'conversation_init' %>

<%= form_for([@conversation, @reply]) do |f| %>
	<%= render 'shared/reply_form', f: f %>
	<%= f.submit "Reply", class: "btn btn-large btn-primary" %>
<% end %>

Oh I forgot to put this code back in before the reply form:

<% if @reply_items.any? %>
<%= render 'reply_item', collection: @reply_items %>
<% end %>