How to remove validation using instance_eval clause in Rails?

Question

I would like to enhance existing class using instance_eval. There original definition contains validation, which require presence of certain fields, ie:

class Du         


        

Answer 1

Every Rails validator, pre-defined or custom, is an object, and is expected to respond to #validate(record) method. You can monkey patch or stub this method.

# MyModel.validators_on(:attr1, :attr2, ...) is also useful
validator = MyModel.validators.detect do |v|
  validator_i_am_looking_for?(v)
end

def validator.validate(*_)
  true
end

# In RSpec you can also consider:
allow(validator).to receive(:validate).and_return(true)

Tested in Rails 5.1.

Don't do this unless you understand what you're doing ;)