Feature request: add .on(:create) and .on(:update) for model validation matchers

[mejibyte]

Hi,

I would love to see something like:

describe Monkey do
    it { should validate_presence_of(:banana).on(:create) }
    it { should_not validate_presence_of(:age).on(:update) }
end

What do you think? Would that be possible?

[calebhearth]

Validation options for validates_presence_of:

• message - A custom error message (default is: "can‘t be blank").
• on - Specifies when this validation is active (default is :save, other options :create, :update).
• if - Specifies a method, proc or string to call to determine if the validation should occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value.
• unless - Specifies a method, proc or string to call to determine if the validation should not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The method, proc or string should return or evaluate to a true or false value.
• strict - Specifies whether validation should be strict.

https://github.com/rails/rails/blob/3-2-stable/activemodel/lib/active_model/validations/presence.rb

[mejibyte]

@calebthompson, yes, those are the options for validates_presence_of. What's your point?

[calebhearth]

I was planning to take a stab at this later, just wanted to have those as notes for myself.

[jsmestad]

Would love to have this

[gabebw]

I agree that this would be a nice feature. I'll look into this, but I'd make more time for a pull request implementing this.

[kitop]

It would be really great to see something like this.

[brodock]

+1 on this too

[drapergeek]

This was added in #246. We will be releasing a new version which includes it later today.