is there a clean way to access the parent object from within the child resource?

[dreyks]

Hi!

I have an association where I want a different child structure depending on a certain state of the parent. I cannot use the Rails inverse association because my parent belongs_to the child, so the child itself doesn't know which parent it was called from

The association's resource block only receives the child, not the parent; the association's main block is executed in the context of an empty proxy serializer, so no access to the parent; the source block does have access to the parent instance, but not the child resource

For now, i ended up forgoing the association entirely, and just using a custom attribute

attribute :child do
  ChildResource.new(object.child, with_traits: object.condition ? [:some_trait] : nil).to_h
end

but this looks a bit clumsy. I feel like I'm missing something obvious 😅

[okuramasafumi]

@dreyks Maybe this one? https://github.com/okuramasafumi/alba/blob/main/README.md#params-override

[dreyks]

this would work if params could be a proc. otherwise, i can't pass the value from the parent

one: child, params: Proc.new { |parent| parent.condition ? {expose_secret: false} : {} }