CODEWITHSUNDEEP
ruby-on-rails
Martin
Martin

Reputation: 11336

validate presence of nested model

I have many photos that belong to a Movie like Movie.photos

Any idea how can I validate that a Movie should have at least one photo?

validates_presence_of :photos doesn't work or at least is considering nil as valid.

I'm interested in validate against a real nested object.

Upvotes: 1

Views: 646

Answers (1)

agmcleod
agmcleod

Reputation: 13621

I don't think there's a built in validator for this, like presence_of, so you can just write your own. The following goes in your movie.rb file.

validate :at_least_one_photo

private


def at_least_one_photo
  if photos.size < 1
    errors.add :base, "The movie must have at least one photo attached before saving"
  end
end

Upvotes: 3

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