init project

app/models/course_module.rb

@@ -0,0 +1,28 @@
+class CourseModule < ApplicationRecord
+  default_scope { order("course_modules.position ASC") }
+  belongs_to :course
+
+  # 二级目录
+  has_many :course_second_categories
+
+  validates :module_name, length: { maximum: 20, too_long: "不能超过20个字符" }
+
+  scope :not_hidden,                   -> { where(hidden: 0) }
+  scope :graduation_module,            -> { where(module_type: "graduation") }
+  scope :graduation_module_not_hidden, -> { graduation_module.where(hidden: 0) }
+  scope :board_module,                 -> { where(module_type: 'board') }
+  scope :attachment_module,            -> { includes(:course_second_categories).where(module_type: 'attachment') }
+  scope :common_homework_module,       -> { where(module_type: 'common_homework') }
+  scope :group_homework_module,        -> { where(module_type: 'group_homework') }
+  scope :shixun_homework_module,       -> { where(module_type: 'shixun_homework') }
+  scope :search_by_module_type,        -> (type) {where(module_type:type)}
+
+  # 课堂模块的子目录
+  def course_second_categories
+    if module_type == "graduation" && CourseSecondCategory.where(course_module_id: self.id).count == 0
+      CourseSecondCategory.create!(course_module_id: self.id, course_id: self.course_id, name: "毕设选题", category_type: "graduation", position: 1)
+      CourseSecondCategory.create!(course_module_id: self.id, course_id: self.course_id, name: "毕设任务", category_type: "graduation", position: 2)
+    end
+    CourseSecondCategory.where(course_module_id: self.id)
+  end
+end