27 lines
858 B
Ruby
27 lines
858 B
Ruby
class Relation < ActiveRecord::Base
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belongs_to :target, :polymorphic => true
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belongs_to :object, :polymorphic => true
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ROLES = %w[reader writer admin]
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validates :role, :inclusion => {:in => ROLES}
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# validate { errors.add(:object, :taken) if Relation.where(:object_type => self.object_type, :object_id => self.object_id).present? }
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before_validation :add_default_role
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scope :by_object, lambda {|obj| {:conditions => ['object_id = ? AND object_type = ?', obj.id, obj.class.to_s]}}
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scope :by_target, lambda {|tar| {:conditions => ['target_id = ? AND target_type = ?', tar.id, tar.class.to_s]}}
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def self.create_with_role(object, target, role)
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r = new
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r.object = object
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r.target = target
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r.role = role
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r.save
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end
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protected
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def add_default_role
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self.role = ROLES.first if role.nil? || role.empty?
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end
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end
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