prevents the use of attributes that match core functions

I'm creating a resource that has a method attribute, but due to the way it works now:

  define_method attr do
    @model.public_send(options[:delegate] ? options[:delegate].to_sym : attr)
  end unless method_defined?(attr)

It fails to work for me. I know method is a core ruby function, but it's also the word used to describe HTTP's GET and PUT.

One option is to simply drop the unless. Allow rewriting, but warn.

Another option is to provide an in and out type option. Currently I would describe delegate as the in, where it describes how to take in the data, and I would provide a key option as the out functionality (what the resulting key will look like).

Start at the resource attribute definition shown in the issue and inspect how method_defined? blocks generated accessors for names such as method. Decide whether collisions should be overwritten with a warning or mapped with an explicit output key, then add regression coverage for the chosen behavior.