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由 Dmitry Polushkin 提交于
Example: ```ruby class Person include ActiveModel::Validations attr_reader :name, :title validates_presence_of :name, on: :create validates_presence_of :title, on: :update end person = Person.new person.valid?([:create, :update]) # => true person.errors.messages # => {:name=>["can't be blank"], :title=>["can't be blank"]} ```
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