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class Group < ActiveRecord::Base
attr_accessible :name, :active, :comment
has_many :group_memberships, :dependent => :destroy
has_many :group_permissions, :dependent => :destroy
has_many :permittances, :foreign_key => :target_group_id, :class_name => "GroupPermission", :dependent => :destroy
validates :name,
:presence => true
def to_s
self.name
end
def permission_targets(permission)
group_permissions.where(:permission => permission).pluck(:target_group_id)
end
def self.union(sets=[])
group_ids = []
sets.each do |set|
group_ids = group_ids + set
end
return group_ids.uniq
end
end
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