Method: ActiveModel::Validations::ClassMethods#validates_each

Defined in:
lib/active_model/validations.rb

#validates_each(*attr_names, &block) ⇒ Object

Validates each attribute against a block.

class Person
  include ActiveModel::Validations

  attr_accessor :first_name, :last_name

  validates_each :first_name, :last_name, allow_blank: true do |record, attr, value|
    record.errors.add attr, "starts with z." if value.start_with?("z")
  end
end

Options:

  • :on - Specifies the contexts where this validation is active. Runs in all validation contexts by default nil. You can pass a symbol or an array of symbols. (e.g. on: :create or on: :custom_validation_context or on: [:create, :custom_validation_context])

  • :allow_nil - Skip validation if attribute is nil.

  • :allow_blank - Skip validation if attribute is blank.

  • :if - Specifies a method, proc, or string to call to determine if the validation should occur (e.g. if: :allow_validation, or if: Proc.new { |user| user.signup_step > 2 }). The method, proc or string should return or evaluate to a true or false value.

  • :unless - Specifies a method, proc, or string to call to determine if the validation should not occur (e.g. unless: :skip_validation, or unless: Proc.new { |user| user.signup_step <= 2 }). The method, proc, or string should return or evaluate to a true or false value.



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# File 'lib/active_model/validations.rb', line 85

def validates_each(*attr_names, &block)
  validates_with BlockValidator, _merge_attributes(attr_names), &block
end