用户应该能够创建一个记录,并将这些属性留空.

或者,如果用户输入这些属性的值,则它们应该在数值范围内并在一定范围内进行验证.

在模型中,我有这样的东西

validates_presence_of :name    
validates_numericality_of :a,:only_integer => true,:message => "can only be whole number."
validates_inclusion_of :a,:in => 1..999,:message => "can only be between 1 and 999."

如果我现在用最小要求的属性进行测试以保存：

factory :model do
  sequence(:name) { |n| "model#{n}" }
end

it "should save with minium attributes" do
  @model = FactoryGirl.build(:model)
  @model.save.should == false
end

我得到

Validation Failed: a can only be whole number.,a can only be between 1 and 999.

如果给出一个值：a,同时仍然允许：a在某些情况下为零,如何验证数值和包含？

谢谢