ActiveRecord::Validations
Active Record Validations¶ ↑ Active Record includes the majority of its validations from ActiveModel::Validations. In Active Record, all validations are performed on save by default. Validations accept the :on argument to define the context where the validations are active. Active Record will pass either the context of :create or :update depending on whether the model is a new_record?.
ActiveRecord::Validations::ClassMethods
# File activerecord/lib/active_record/validations/absence.rb, line 20 def validates_absence_of(*attr_names) validates_with AbsenceValidator, _merge_attributes(attr_names) end Validates whether the associated object or objects are all valid. Works with any kind of association. class Book < ActiveRecord::Base has_many :pages belongs_to :library validates_associated :pages, :library end WARNING: This
Active Record Validations — Ruby on Rails Guides
This guide teaches you how to validate Active Record objects before saving them to the database using Active Record's validations feature. After reading this guide, you will know: How to use the built-in Active Record validations and options. How to check the validity of objects. How to create conditional and strict validations. How to create your own custom validation methods. How to work with th
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