# Borrowed from rspec-rails # https://github.com/rspec/rspec-rails/blob/master/lib/rspec/rails/extensions/active_record/base.rb module ::ActiveModel::Validations # Extension to enhance `to have` on AR Model instances. Calls # model.valid? in order to prepare the object's errors object. Accepts # a :context option to specify the validation context. # # You can also use this to specify the content of the error messages. # # @example # # expect(model).to have(:no).errors_on(:attribute) # expect(model).to have(1).error_on(:attribute) # expect(model).to have(n).errors_on(:attribute) # expect(model).to have(n).errors_on(:attribute, context: :create) # # expect(model.errors_on(:attribute)).to include("can't be blank") def errors_on(attribute, options = {}) valid_args = [options[:context]].compact self.valid?(*valid_args) [self.errors[attribute]].flatten.compact end alias :error_on :errors_on end