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49 lines
1.7 KiB
49 lines
1.7 KiB
6 years ago
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class CourseGroup < ActiveRecord::Base
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# attr_accessible :title, :body
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belongs_to :course
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has_many :members
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has_many :memberships, :class_name => 'Member'
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has_many :member_principals, :class_name => 'Member',
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:include => :principal,
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:conditions => "#{Principal.table_name}.type='Group' OR (#{Principal.table_name}.type='User' AND #{Principal.table_name}.status=#{Principal::STATUS_ACTIVE})"
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has_many :principals, :through => :member_principals, :source => :principal
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has_many :users, :through => :members
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has_many :homework_group_settings, :dependent => :destroy
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has_many :exercise_group_settings, :dependent => :destroy
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has_many :homework_group_reviews, :dependent => :destroy
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has_many :poll_group_settings, :dependent => :destroy
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has_many :attachment_group_settings, :dependent => :destroy
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has_many :teacher_course_groups, :dependent => :destroy
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before_destroy :set_member_nil
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# attr_accessible :name
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validates :name, :presence => true, :length => {:maximum => 20}, :uniqueness => { :scope => :course_id}
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after_create :generate_invite_code
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# 延迟生成邀请码
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def invite_code
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return generate_invite_code
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end
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# 生成邀请码
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CODES = %W(2 3 4 5 6 7 8 9 A B C D E F G H J K L N M O P Q R S T U V W X Y Z)
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def generate_invite_code
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code = read_attribute(:invite_code)
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if !code || code.size < 6
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code = CODES.sample(6).join
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return generate_invite_code if CourseGroup.where(invite_code: code).present?
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update_attribute(:invite_code, code)
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end
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code
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end
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def set_member_nil
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if self.members && self.members.count > 0
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self.members.update_all("course_group_id = 0")
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end
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end
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end
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