添加CourseStatus表和model

app/models/course_status.rb

@@ -0,0 +1,3 @@
+class CourseStatus < ActiveRecord::Base
+  attr_accessible :changesets_count, :course_ac_para, :course_id, :grade, :watchers_count
+end

db/migrate/20140529084427_create_course_statuses.rb

@@ -0,0 +1,13 @@
+class CreateCourseStatuses < ActiveRecord::Migration
+  def change
+    create_table :course_statuses do |t|
+      t.integer :changesets_count
+      t.integer :watchers_count
+      t.integer :course_id
+      t.float :grade ,default:0
+      t.integer :course_ac_para ,default:0
+
+      t.timestamps
+    end
+  end
+end