修改作业描述字段的类型，页面代码优化

app/views/bids/_history.html.erb

@@ -38,8 +38,6 @@
                      %>
                 <% end %>
                 <% if @user==User.current|| User.current.admin? %>
-          <%#= link_to(l(:label_bid_respond_delete), {:controller => 'bids', :action => 'destroy', :object_id => journal, :id => bid},:confirm => l(:label_delete_confirm),
-					    	:remote => true, :method => 'delete', :class => "delete", :confirm => l(:text_are_you_sure), :title => l(:button_delete)) %>
                   <%= link_to(l(:label_bid_respond_delete), {:controller => 'words', :action => 'destroy', :object_id => journal, :user_id => @user}, :remote => true, :confirm => l(:text_are_you_sure), :method => 'delete', :class => "delete", :title => l(:button_delete))  %>
                 <% end %>
 				</span>

db/migrate/20141009055029_update_homeworkattach_description.rb

@@ -0,0 +1,5 @@
+class UpdateHomeworkattachDescription < ActiveRecord::Migration
+  def change
+    change_column :homework_attaches, :description, :text, default: nil
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20141009010934) do
+ActiveRecord::Schema.define(:version => 20141009055029) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false
@@ -473,7 +473,7 @@ ActiveRecord::Schema.define(:version => 20141009010934) do
     t.datetime "updated_at",                 :null => false
     t.string   "reward"
     t.string   "name"
-    t.string   "description"
+    t.text     "description"
     t.integer  "state"
     t.integer  "project_id",  :default => 0
   end