小编Ole*_*huk的帖子

模型

validates_length_of :description, :maximum => 255, :allow_nil => true

spec_file

it { should ensure_length_of(:description).is_at_most(255).allow_nil }

回归

Failure/Error: it { should ensure_length_of(:description).is_at_most(255).allow_nil }
 NoMethodError:
   undefined method `allow_nil' for #<Shoulda::Matchers::ActiveModel::EnsureLengthOfMatcher:0x0000000acb03e0>

请帮忙!