CODEWITHSUNDEEP
ruby-on-railsvalidationruby-on-rails-4rails-activerecord
Daniel
Daniel

Reputation: 4173

Rails: How to validate an specific state of an object without changing its attributes?

I have a Model with the column completed. To set completed to true, it has to match certain validations to become valid.

Is there some easy way to check out if an object is valid with completed set to true without actually changing the attribute of an object?

Currently I'm doing this:

def ready_for_completion?
  self.completed = true
  ready = self.valid?
  self.completed = false
  ready
end

But I think there is a much nicer way to do this, just haven't found out how.

UPDATE:

I should have been more accurate.

My problem is view specific, I have a button on a object which sets completed to true after hitting it and I want that button to be disabled if the object is not ready for completion.

Upvotes: 0

Views: 396

Answers (3)

Pierre-Louis Gottfrois
Pierre-Louis Gottfrois

Reputation: 17631

I would not validate your completed field. It is your responsibility to set this attribute when you feel that your "object" is completed.

You should take a look at state machine

Upvotes: 3

Vikram Jain
Vikram Jain

Reputation: 5588

just you can use valid? for test model is valid or not in controller/view/model as
per below example:
      if model.valid?
       #your code
      end
    ===============
    class Person < ActiveRecord::Base
      validates :name, presence: true
    end

    Person.create(name: "John Doe").valid? # => true
    Person.create(name: nil).valid? # => false

Upvotes: 0

BroiSatse
BroiSatse

Reputation: 44685

The approach is correct, however I would wrap it into a method

def as_completed
  old_completed = completed
  self.completed = true
  result = yield
  self.completed = old_completed
  result
end

Then

def ready_for_completion?
  as_completed { valid? }
end

Upvotes: 0

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