Question

I am using Ruby on Rails 3.0.9 and I am trying to validate a nested model in a specific context just for the email attribute uniqueness.

In my controller I have:

@user.valid? :uniqueness_context

In my nested model I have:

validates :email,
  :format     => {
    :with     => EMAIL_REGEX
  },
  :uniqueness => {
    :on => :uniqueness_context # Here it doesn't work
  },
  :presence   => true

What is wrong? How can I make the above validation code to work?

---

Notice: if in the model I use the following:

validates :email,
  :format     => {
    :with     => EMAIL_REGEX
  },
  :uniqueness => true,
  :presence   => true

all works as expected.

---

In order to solve the issue I have tried also to use the following in the model:

validates :email,
  :format     => {
    :with     => EMAIL_REGEX
  },
  :presence   => true

validates_uniqueness_of :email, :on => :uniqueness_context

but it still doesn’t work.

Answer 1

I ran into the same problem. Seems that Rails currently does not support custom validation contexts. :if will do the job for you.