Class: ActiveModel::EachValidator

Inherits:

Validator

• Object
• Validator
• ActiveModel::EachValidator

Defined in:

activemodel/lib/active_model/validator.rb

Overview

Active Model EachValidator

EachValidator is a validator which iterates through the attributes given in the options hash invoking the validate_each method passing in the record, attribute, and value.

All Active Model validations are built on top of this validator.

Direct Known Subclasses

BlockValidator, Validations::AbsenceValidator, Validations::AcceptanceValidator, Validations::ComparisonValidator, Validations::ConfirmationValidator, Validations::ExclusionValidator, Validations::FormatValidator, Validations::InclusionValidator, Validations::LengthValidator, Validations::NumericalityValidator, Validations::PresenceValidator, Validations::WithValidator, ActiveRecord::Validations::AssociatedValidator, ActiveRecord::Validations::UniquenessValidator

Instance Attribute Summary

• #attributes ⇒ Object readonly

  Returns the value of attribute attributes.

Attributes inherited from Validator

#options

Instance Method Summary

• #check_validity! ⇒ Object

  Hook method that gets called by the initializer allowing verification that the arguments supplied are valid.

• #initialize(options) ⇒ EachValidator constructor

  Returns a new validator instance.

• #validate(record) ⇒ Object

  Performs validation on the supplied record.

• #validate_each(record, attribute, value) ⇒ Object

  Override this method in subclasses with the validation logic, adding errors to the records errors array where necessary.

Methods inherited from Validator

kind, #kind

Constructor Details

#initialize(options) ⇒ EachValidator

Returns a new validator instance. All options will be available via the options reader, however the :attributes option will be removed and instead be made available through the attributes reader.

Raises:

• (ArgumentError)

# File 'activemodel/lib/active_model/validator.rb', line 140

def initialize(options)
  @attributes = Array(options.delete(:attributes))
  raise ArgumentError, ":attributes cannot be blank" if @attributes.empty?
  super
  check_validity!
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.

# File 'activemodel/lib/active_model/validator.rb', line 135

def attributes
  @attributes
end

Instance Method Details

#check_validity! ⇒ Object

Hook method that gets called by the initializer allowing verification that the arguments supplied are valid. You could for example raise an ArgumentError when invalid options are supplied.

# File 'activemodel/lib/active_model/validator.rb', line 168

def check_validity!
end

#validate(record) ⇒ Object

Performs validation on the supplied record. By default this will call validate_each to determine validity therefore subclasses should override validate_each with validation logic.

# File 'activemodel/lib/active_model/validator.rb', line 150

def validate(record)
  attributes.each do |attribute|
    value = record.read_attribute_for_validation(attribute)
    next if (value.nil? && allow_nil?(record)) || (value.blank? && allow_blank?(record))
    value = prepare_value_for_validation(value, record, attribute)
    validate_each(record, attribute, value)
  end
end

#validate_each(record, attribute, value) ⇒ Object

Override this method in subclasses with the validation logic, adding errors to the records errors array where necessary.

Raises:

• (NotImplementedError)

# File 'activemodel/lib/active_model/validator.rb', line 161

def validate_each(record, attribute, value)
  raise NotImplementedError, "Subclasses must implement a validate_each(record, attribute, value) method"
end