Description
Trying to update tapioca from 0.12.0 to 0.13.1 results in this error:
path/to/file.rb:32: Method page does not exist on Model::PrivateAssociationRelation https://srb.help/7003
32 | @records = Model.all.page(params[:page]).per(25)
Investigation
The page method is defined on the class by kaminari:
https://github.com/kaminari/kaminari/blob/9182d065c144afa45c6b7cf444f810bea1fd7201/kaminari-activerecord/lib/kaminari/activerecord/active_record_model_extension.rb#L14-L23
But attempting to introspect it at runtime yields nothing:
pry(main)> Model.all.method(:page)
=> #<Method: Model::ActiveRecord_Relation#page(*)>
pry(main)> Model.all.method(:page).source_location
=> nil
pry(main)> Model.all.method(:page).owner
=> Model::ActiveRecord_Relation
pry(main)> Model.all.method(:page).owner.instance_method(:page)
NameError: undefined method `page' for class `ActiveRecord::Relation'
from (pry):1:in `instance_method'from (pry):35:in `method'
pry(main)> Model.all.methods.include?(:page)
=> falseThis is because it is delegated by https://github.com/rails/rails/blob/d37c533139f70efdcd95f8dadd48c10eba429f94/activerecord/lib/active_record/relation/delegation.rb#L71-L88
Which is generated on demand when the method is missing:
https://github.com/rails/rails/blob/d37c533139f70efdcd95f8dadd48c10eba429f94/activerecord/lib/active_record/relation/delegation.rb#L115-L124
Attempting the same as above after calling the method once does yield something a bit more interesting:
pry(main)> Model.all.method(:page)
=> #<Method: Model::ActiveRecord_Relation(Model::GeneratedRelationMethods)#page(...) /Users/seb/.gem/ruby/3.2.2/gems/activerecord-7.1.3.2/lib/active_record/relation/delegation.rb:78>
pry(main)> Model.all.method(:page).source_location
=> ["/Users/seb/.gem/ruby/3.2.2/gems/activerecord-7.1.3.2/lib/active_record/relation/delegation.rb", 78]
pry(main)> Model.all.method(:page).owner
=> Model::GeneratedRelationMethods
pry(main)> Model.all.method(:page).owner.instance_method(:page)
=> #<UnboundMethod: Model::GeneratedRelationMethods#page(...) /Users/seb/.gem/ruby/3.2.2/gems/activerecord-7.1.3.2/lib/active_record/relation/delegation.rb:78>
pry(main)> Model.all.methods.include?(:page)
=> trueThe same can be achieved by calling Model.generate_relation_method(:page)
Workaround
Adding this in config/initializers/kaminari.rb makes tapioca generate the methods:
if defined?(Tapioca)
Rails.application.config.after_initialize do
Rails.application.eager_load!
ActiveRecord::Base.descendants.each do |model|
model.generate_relation_method(:page)
model.generate_relation_method(:per)
end
end
end