forum memocount error, footer margin

.gitignore

@@ -1,7 +1,7 @@
 /.project
 /.idea
 /.bundle
-
+*.swp
 /config/database.yml
 /files/*
 /log/*

app/models/forum.rb

@@ -1,7 +1,7 @@
 class Forum < ActiveRecord::Base
   include Redmine::SafeAttributes
   has_many :topics, :class_name => 'Memo', :conditions => "#{Memo.table_name}.parent_id IS NULL", :order => "#{Memo.table_name}.created_at DESC", :dependent => :destroy
-  has_many :memos, :dependent => :destroy
+  has_many :memos, :dependent => :destroy, conditions: "parent_id IS NULL"
   belongs_to :creator, :class_name => "User", :foreign_key => 'creator_id' 
   safe_attributes 'name',
   'description',

app/views/forums/_show_topics.html.erb

@@ -1,6 +1,6 @@
 <!-- added by fq -->
 <!--display the board-->
-<div class="borad-topic-count">共有 <%=link_to memos.count %> 个贴子</div>
+<div class="borad-topic-count">共有 <%=link_to @forum.memos.count %> 个贴子</div>
 <div style="padding-top: 10px">
 <% if memos.any? %>
 	<% memos.each do |topic| %>

app/views/layouts/_base_footer.html.erb

@@ -1,7 +1,7 @@
 <!--add by huang-->
 <div class="clearfix"></div>
 <div id="footer" style="margin-left:-5px;padding-top: 50px;clear: both;font-size: 12px;">
-	<div style="border-top:solid 1px #C6E9F1;width:940px;margin-left:auto;margin-right:auto;margin-bottom: 5px;margin-top: -50px;"></div>
+	<div style="border-top:solid 1px #C6E9F1;width: auto;margin-top: 80px;"></div>
   	<div class="base_footer">
   		<div align="center">