User HasOne ActiveToken, HasMany Tokens, how to setup in Rails?
- by viatropos
I have two simple models:
class User < ActiveRecord::Base
has_many :tokens
# has_one doesn't work, because Token already stores
# foreign id to user...
# has_one :active_token, :class_name => "Token"
# belongs_to doesn't work because Token belongs to
# User already, and they both can't belong to each other
# belongs_to :active_token, :class_name => "Token"
end
class Token < ActiveRecord::Base
belongs_to :user
end
I want to say "User has_one :active_token, :class_name => 'Token'", but I can't because Token already belongs_to User. What I did instead was just manually add similar functionality to the user like so:
class User < ActiveRecord::Base
has_many :tokens
attr_accessor :active_token
after_create :save_active_token
before_destroy :destroy_active_token
# it belongs_to, but you can't have both belongs_to each other...
def active_token
return nil unless self.active_token_id
@active_token ||= Token.find(self.active_token_id)
end
def active_token=(value)
self.active_token_id = value.id
@active_token = value
end
def save_active_token
self.active_token.user = self
self.active_token.save
end
def destroy_active_token
self.active_token.destroy if self.active_token
end
end
Is there a better way?
