object method inside an Alba::Resource

[davidgm0]

I'm new to Alba and I come from AMS. While trying to migrate, I was trying to serialize a list of objects:

SomeSerializer.new([user1, user2]).serialize

In my serializer I had:

class SomeSerializer
  include Alba::Resource # This was before an `ActiveModel::Serializer`

  attribute :id do
    object.token
  end
end

This was giving me an error:

*** NoMethodError Exception: undefined method `token' for #<ActiveRecord::AssociationRelation [#<User... 

This is because object for Alba is the 'whole array' passed, where for AMS is the current object being serialized.

I had to switch to

attribute :id do |resource|
    resource.token
end

This will require substantial changes to the serializers. What's the background on the whole object being available to the serializer? I was thinking if I could define somehow an object method that gets the resource, so I don't need to do some changes, but I don't think that's going to work.

[okuramasafumi]

@davidgm0 Actually there IS object method, but it points to the object given to a resource class during initialization.

# this `users` is `object` in serializer class
SomeSerializer.new(users).serialize

Alba is not meant be 100% compatible with AMS, but we'd like to make migration as easy as possible.
In this case, if object is user instead of users, it's better for migration.

One simple way is to rename a block argument from resource to object.

# This should work
attribute :id do |object|
    object.token
end

Then it's easier to do so with automation such as editor macro, just adding |object| to each end of attribute line.

[davidgm0]

Good tip, thanks!