ActiveModel: Validate Value for Equality

Question

I have an ActiveModel class whose instances should only be valid if they have been touched. The following code works:

class Base
  include ActiveModel::Model
  validates :touched?, inclusion: { in: [true] }

  def update(params = {})
    initialize(params)
    @touched = true
  end

  def touched?
    !!@touched
  end
end

But I don't like it. It's not nice. I'd like to write something like that:

validates: touched?, equality: true

Is there a better/shorter way of writing that without using a custom validator? Would be nice if it worked also for values other than booleans.

score 5 · Answer 1 · answered Feb 18 '16 at 10:52

5

validates :touched?,  acceptance: true

answered Feb 18 '16 at 10:52

Sergei Stralenia

855
7
16

`:acceptance` does't work if there isn't an `attr_reader` for `touched?`. I've updated the class above with more information which seems to be relevant. – schmijos Feb 18 '16 at 11:08
@schmijos, what values of \@touched might be? – Sergei Stralenia Feb 18 '16 at 11:26
The two values possible now are `true` and `nil`. The validation should only pass on `true`. – schmijos Feb 18 '16 at 12:26
if you have touched? method, you might use custom validation, `validate :touched?` – Sergei Stralenia Feb 18 '16 at 13:40

ActiveModel: Validate Value for Equality

1 Answers1