为班级新添加的学生创建已发布作业的作品，状态为未提交

app/models/students_for_course.rb

@@ -1,3 +1,4 @@
+#encoding: utf-8
 class StudentsForCourse < ActiveRecord::Base
   attr_accessible :course_id, :student_id
   
@@ -9,7 +10,7 @@ class StudentsForCourse < ActiveRecord::Base
   validates_uniqueness_of :student_id, :scope => :course_id
 
   after_destroy :delete_student_works
-  after_create :recovery_student_works
+  after_create :recovery_student_works, :create_student_works
 
   #退出班级或删除学生时隐藏学生的作品
   def delete_student_works
@@ -26,4 +27,14 @@ class StudentsForCourse < ActiveRecord::Base
     student_works = StudentWork.where("user_id = #{self.student_id} && homework_common_id in #{homework_ids}")
     student_works.update_all(:is_delete => 0)
   end
+
+  #加入班级时创建已发布作业的作品
+  def create_student_works
+    course = self.course
+    course.homework_commons.each do |hw|
+      if hw.homework_type != 3 && hw.student_works.where("user_id = #{self.student_id}").count == 0
+        hw.student_works << StudentWork.new(:user_id => self.student_id, :name => hw.name.to_s+"的作品提交", :work_status => 0)
+      end
+    end
+  end
 end

db/migrate/20170112072122_add_student_work_data.rb

@@ -0,0 +1,26 @@
+#encoding: utf-8
+class AddStudentWorkData < ActiveRecord::Migration
+  def up
+    count = Course.all.count / 30 + 2
+    transaction do
+      for i in 1 .. count do i
+      Course.page(i).per(30).each do |course|
+        begin
+          course.student.each do |student|
+            course.homework_commons.each do |hw|
+              if hw.homework_type != 3 && hw.student_works.where("user_id = #{student.student_id}").count == 0
+                hw.student_works << StudentWork.new(:user_id => student.student_id, :name => hw.name.to_s+"的作品提交", :work_status => 0)
+              end
+            end
+          end
+        rescue Exception => e
+          logger.error  "[AddStudentWorkData] ===> #{e}"
+        end
+      end
+      end
+    end
+  end
+
+  def down
+  end
+end