attribute class method doesn't work without a block

[dgmora]

I've noticed that if you have the following:

class PostSerializer < Oj::Serializer
  attribute :title
end

You get an error:

       undefined local variable or method `title' for #<PostSerializer:...>
     # (eval):9:in `render_as_hash'
     # /Users/david/.local/share/rtx/installs/ruby/3.0.5/lib/ruby/gems/3.0.0/gems/oj_serializers-2.0.3/lib/oj_serializers/serializer.rb:209:in `one_as_hash'
     # /Users/david/.local/share/rtx/installs/ruby/3.0.5/lib/ruby/gems/3.0.0/gems/oj_serializers-2.0.3/lib/oj_serializers/serializer.rb:169:in `render_as_hash'

This works fine if you have a block or you use attributes:

# works
attribute :title do
 ...
end

# this works too
attributes :title

• I have AMS compat on, if that makes any difference