CODEWITHSUNDEEP
ruby-on-railsruby
ian root
ian root

Reputation: 349

is it possible to programmatically determine what object a method is being delegated to in ruby?

i have a set of objects, some of which have an organization_id attribute, and others of which delegate organization_id.

for example:

class Department
  belongs_to :organization
end
class Program
  belongs_to :department
  delegate :organization_id, to: :department
end

class Role
  belongs_to :organization
end
class UsersRole
  belongs_to :role
  delegate :organization_id, to: :role
end

i would like a means by which to programmatically determine which class of object the organization_id is being delegated to so that i could do something like the following

def find_organization_id_source(object)
   object.organization_id.method_im_hoping_exists
end
$ find_organization_id_source(@program)
>> Department
$ find_organization_id_source(@users_role)
>> Role

Upvotes: 2

Views: 144

Answers (2)

MDrewT
MDrewT

Reputation: 66

def is_delegated?(object, delegated_attribute)
  object.attributes.include? delegated_attribute
end

It won't tell you where you're getting the value from but it should tell you if you've gotten it through delegation.

Upvotes: 0

Wand Maker
Wand Maker

Reputation: 18762

It is not possible. As can be seen in source of active_support/core_ext/module/delegation.rb, Rails creates a new method that will internally invoke the delegated method.

Upvotes: 4

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