CODEWITHSUNDEEP
activerecordruby-on-rails-4
megsolley
megsolley

Reputation: 71

validate presence and uniqueness, rails 4

I have this code in my model:

  validates :user, presence: true, uniqueness: {scope: :project}

The individidual validators, presence and uniqueness, each work fine if the other one isn't there. But if they are both present as above, the presense validator stops working. When I try to save an object that has a nil user, instead of getting an normal save error, i get an exception:

NoMethodError: undefined method 'attributes' for nil:NilClass from /usr/local/lib/ruby/gems/2.0.0/gems/activerecord-4.0.2/lib/active_record/validations/uniqueness.rb:56:in `build_relation'

Is this a bug in ActiveRecord or am I doing something wrong?

Upvotes: 4

Views: 8571

Answers (1)

Rafael Oliveira
Rafael Oliveira

Reputation: 2923

Found a solution (https://github.com/thoughtbot/shoulda-matchers/issues/459), but I don't think this is the best/right way. Just add allow_nil: true.

Then it should be like:

validates :user, presence: true, uniqueness: {scope: :project}, allow_nil: true

Upvotes: 4

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