Overriding association getters

[Мурыгин Антон]

Hi! I saw that i documentation here - http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

Overriding generated methods

Association methods are generated in a module that is included into the model class, which allows you to easily override with your own methods and call the original generated method with super. For example:

class Car < ActiveRecord::Base
  belongs_to :owner
  belongs_to :old_owner
  def owner=(new_owner)
    self.old_owner = self.owner
    super
  end
end

If your model class is Project, the module is named Project::GeneratedFeatureMethods. The GeneratedFeatureMethods module is included in the model class immediately after the (anonymous) generated attributes methods module, meaning an association will override the methods for an attribute with the same name.

Now this is my model

class Business < ActiveRecord::Base
  belongs_to :category, class_name: 'BusinessCategory', foreign_key: 'business_category_id'

  def category

    super || BusinessCategory.new(name: 'other')

  end

end

Why it keeps throwing 

super: no superclass method `category' for #<Business:0x000001023014b8>

? Am i missing something?

[Dave Aronson]

On Monday, June 29, 2015, Мурыгин Антон <mib...@gmail.com> wrote:

class Business < ActiveRecord::Base
  belongs_to :category, class_name: 'BusinessCategory', foreign_key: 'business_category_id'

  def category

    super || BusinessCategory.new(name: 'other')

  end

end

Why it keeps throwing 

super: no superclass method `category' for #<Business:0x000001023014b8>

?

Possibly because AR::Base has no idea about your renaming of that association.  Try calling that method business_category instead, or call business_category instead of super.  (Just don't do both,)

--
Sent from Gmail Mobile; please excuse top posting, typos, etc. :-(

[Мурыгин Антон]

Hey, but i did not rename it. My model hasn't methods called busyness_category! I though AR generates them according to first argument to 'belongs_to' method, rather than from foreign key name

понедельник, 29 июня 2015 г., 17:05:42 UTC+3 пользователь Dave Aronson написал:

[Frederick Cheung]

On Monday, June 29, 2015, Мурыгин Антон <mib...@gmail.com> wrote:

Now this is my model

class Business < ActiveRecord::Base
  belongs_to :category, class_name: 'BusinessCategory', foreign_key: 'business_category_id'

  def category

    super || BusinessCategory.new(name: 'other')

  end

end

Why it keeps throwing 

super: no superclass method `category' for #<Business:0x000001023014b8>

? Am i missing something?

 

Which version of rails?

Fred 

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[Мурыгин Антон]

My rails version is 4.2.2.

понедельник, 29 июня 2015 г., 20:00:27 UTC+3 пользователь Frederick Cheung написал:

On Monday, June 29, 2015, Мурыгин Антон <mib...@gmail.com> wrote:

Now this is my model

class Business < ActiveRecord::Base
  belongs_to :category, class_name: 'BusinessCategory', foreign_key: 'business_category_id'

  def category

    super || BusinessCategory.new(name: 'other')

  end

end

Why it keeps throwing 

super: no superclass method `category' for #<Business:0x000001023014b8>

? Am i missing something?

 

Which version of rails?

Fred 

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[Frederick Cheung]

On Monday, June 29, 2015 at 7:40:58 PM UTC+1, Мурыгин Антон wrote:

My rails version is 4.2.2.

Weird - I created a fresh rails app, added a business model like yours and it works fine. I'd recommended doing the same and seeing whether you can isolate what it is about your app that is different (for example is Business::GeneratedAssociationMethods in the ancestor chain for business? What does Profile::GeneratedAssociationMethods.instance_methods look like?)

Fred

[Мурыгин Антон]

Oh yeah, this is because of one gem i use that extends AR in that way. Thanks that you set up fresh app, that helped me.

вторник, 30 июня 2015 г., 14:24:02 UTC+3 пользователь Frederick Cheung написал: