数据库迁移：更改了默认的学校logo

app/views/welcome/course.html.erb

@@ -32,11 +32,13 @@
 						<% if School.find(User.current.user_extensions.school.id).logo_link.nil? %>
 							<%= image_tag '/images/transparent.png', size: "75x75" %>
 						<% else %>
+							<%#= image_tag('/images/school/default.png', size: "75x75") %>
 							<%= image_tag(School.find(User.current.user_extensions.school.id).logo_link, size: "75x75") %>
 						<% end %>
 						<br />
 					<% else %>
 						<%= image_tag(School.find(params[:school_id]).logo_link, size: "75x75") %>
+						<%#= image_tag('/images/school/default.png', size: "75x75") %>
 						<br />
 					<% end %>
 				<% end %>

db/migrate/20140428013546_change_default_logo_for_school.rb

@@ -0,0 +1,15 @@
+class ChangeDefaultLogoForSchool < ActiveRecord::Migration
+  def up
+    execute <<-SQL
+      UPDATE schools SET logo_link = '/images/school/default.png' 
+      WHERE id <> 117
+    SQL
+  end
+
+  def down
+    execute <<-SQL
+      UPDATE schools SET logo_link = '/images/transparent.png'
+      WHERE id <> 117
+    SQL
+  end
+end