How to set writeable dynamically?

[tangrufus]

How to set writeable dynamically? (with a block / lambda or...)

Tried these, all act as writeable: true no matter what's in the model

module User
  module Contract
    class Update < Reform::Form
      property :nickname, writeable: -> { model.nickname.blank? }
      property :address, writeable: model_nickname_blank?
      property :phone, writeable: :model_phone_blank

      def model_nickname_blank?
          model.nickname.blank?
      end

      def model_phone_blank
          model.phone.blank?
      end
    end
  end
end

Thanks!

[adis-io]

How can I set writable = true on new model and and writable = false on persisted model?

[apotonick]

You need two different twins, that's the idea, to treat different contexts (create vs. update) with different classes and not one big mess the way AR handles it (or doesn't).

[adis-io]

@apotonick
The thing is I'm using reform, where I can do this:

Myform.new(MyModel.new)

or

Myform.new(MyModel.find(1))

[timoschilling]

property :nickname, writeable: -> { model.persisted? }

That should work for you.

[apotonick]

@adisos Reform doesn't care whether you use it for updating or creating things. It's your job as a software engineer to decide if you want to "hack" it (see last messages) or if you need a new contract to separate. I'd totally go with @timoschilling's solution if it was only one field, but extract a separate Update contract when it gets more.

[oleg-kiviljov]

I tried @timoschilling solution but seems that it does not actually execute the lambda, did someone try it? Using disposable 0.4.4