32 lines
1.0 KiB
Ruby
32 lines
1.0 KiB
Ruby
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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before_destroy :set_member_nil
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attr_accessible :name
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validates :name, :presence => true, :length => {:maximum => 20}
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validate_on_create :unique_name_and_course
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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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private
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def unique_name_and_course
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if CourseGroup.find(:conditions => ["name=? and course_id=?", name, course_id]).first
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errors.add_to_base("该班名已被使用!")
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end
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end
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end
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