with_associated_scope¶ ↑

DRYing up named_scopes

class Organization < ActiveRecord::Base
  named_scope :active, :conditions => { :active => true }
end

class Person < ActiveRecord::Base
  belongs_to :organization
end

Normally, to find all the people whose organization is active, you’d have to duplicate the logic in ‘Organziation`’s named_scope:

named_scope :with_active_organization, :conditions => {:organizations => {:active => true}}, :joins => :organization

That isn’t DRY. With this plugin, you can simply write:

Person.with_associated_scope(:organization, :active)

and get back all the people whose organization is active.

Deeply nested attributes¶ ↑

Support exists for deeply nested attributes. Continuing the example above:

class Task < ActiveRecord::Base
  belongs_to :person
end

Task.with_associated_scope({:person => :organization}, :active)

And you’ll get all the tasks whose associated person’s organization is active.

Procedural named scopes¶ ↑

The most powerful feature of named_scopes is the ability to pass a lambda to have the conditions vary. For example:

class Organization < ActiveRecord::Base
  named_scope :created_after, lambda { |date|
    :conditions => { "organizations.created_at > ?", date }
  }
end

with_associated_scope simply passes the values along:

Person.with_associated_scope(:organization, :created_after, 1.year.ago)
Task.with_associated_scope({:person => :organization}, :created_after, 1.year.ago)

Status¶ ↑

This is pre-alpha software; while it basically seems to work, the test coverage is pretty minimal

Your contributions, forkings, comments and feedback are greatly welcomed.

License¶ ↑

with_associated_scope is available under the MIT License