rails--rails/activerecord/test/models/man.rb at b794765296c3e5bbe502697158ac820b0ee5c40e - kotovalexarian-likes-github/rails--rails - Forgejo by Causa Arcana

kotovalexarian-likes-github/rails--rails

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Murray Steele ccea98389a Providing support for :inverse_of as an option to associations.

You can now add an :inverse_of option to has_one, has_many and belongs_to associations.  This is best described with an example:

class Man < ActiveRecord::Base
  has_one :face, :inverse_of => :man
end

class Face < ActiveRecord::Base
  belongs_to :man, :inverse_of => :face
end

m = Man.first
f = m.face

Without :inverse_of m and f.man would be different instances of the same object (f.man being pulled from the database again).  With these new :inverse_of options m and f.man are the same in memory instance.

Currently :inverse_of supports has_one and has_many (but not the :through variants) associations.  It also supplies inverse support for belongs_to associations where the inverse is a has_one and it's not a polymorphic.

Signed-off-by: Murray Steele <muz@h-lame.com>
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

2009-05-04 15:27:39 -07:00

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 class Man < ActiveRecord::Base
   has_one :face, :inverse_of => :man
   has_many :interests, :inverse_of => :man
   # These are "broken" inverse_of associations for the purposes of testing
   has_one :dirty_face, :class_name => 'Face', :inverse_of => :dirty_man
   has_many :secret_interests, :class_name => 'Interest', :inverse_of => :secret_man
 end