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class GroupMembership < ActiveRecord::Base
attr_accessible :group_id, :item_type, :item_id
belongs_to :group
belongs_to :item, :polymorphic => true
validates :item_id,
:presence => true,
:uniqueness => { :scope => [:group_id, :item_type] }
validates :item_type,
:presence => true,
:uniqueness => { :scope => [:group_id, :item_id] }
validate :validate_item_type_consitency
validates :item,
:presence => true
def to_s
"#{self.item_type}: #{self.item}"
end
def item_type_allowed
fist_item = self.group.group_memberships.first.try(:item)
if fist_item
return fist_item.class.name
end
end
def validate_item_type_consitency
type_allowed = self.item_type_allowed
if type_allowed && type_allowed != self.item_type
errors.add(:item_type, "must be of type: #{type_allowed}")
end
end
end
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