CODEWITHSUNDEEP
ruby-on-railsactiverecordhas-many
ranska
ranska

Reputation: 33

Issue with ActiveRecord association: "The Lap model class is not an ActiveRecord::Base subclass"

I'm facing a strange issue with an ActiveRecord association in my Ruby on Rails project. When I try to access the laps association method from my User model, I get a peculiar error.

Error:

ArgumentError: The Lap model class for the User#laps association is not an ActiveRecord::Base subclass.

I've double-checked, and Lap is definitely a subclass of ActiveRecord::Base. I'm using Rails 7.1.3 and Ruby 3.2.2.

Here's the code for my User model:

class User < ApplicationRecord
  has_many :laps
end

And here's the code for my Lap model:

class Lap < ApplicationRecord
  belongs_to :user
end

I can't figure out why I'm getting this error. Has anyone else encountered a similar issue or have any ideas on how to resolve it?

I use

User.reflect_on_association(:laps).klass

what create an error but with the relation quiz has_many :laps and Quiz.reflect_on_association(:laps).klass

There is no errors in the 2nd case so I didn't understand why to similar code have different résult.

Upvotes: 2

Views: 544

Answers (2)

Nuclearman
Nuclearman

Reputation: 5314

A more straightforward fix for this is to tell it what the model class is and make the namespacing clear.

class User < ApplicationRecord
  has_many :laps, class_name: "::Lap"
end

The :: at the front tells Rails that should not be looking for User::Lap but just Lap.

Upvotes: 0

Bles Muchaya
Bles Muchaya

Reputation: 11

I do not have enough information here but I think you probably have app/models/lap.rb in and app/models/user/lap.rb

If that's the case, then there's probably a naming collision at play. You need to change the name lap.rb in the module to something else eg. app/models/user/lappable.rb

module User::Lappable
  extend ActiveSupport::Concern
end

class User
  include Lappable
end

Upvotes: 0

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