Class: ActiveModel::EachValidator

Inherits:
Validator
  • Object
show all
Defined in:
lib/active_model/validator.rb

Overview

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.

Instance Attribute Summary collapse

Attributes inherited from Validator

#options

Instance Method Summary collapse

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.



139
140
141
142
143
144
 
# File 'lib/active_model/validator.rb', line 139

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

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



134
135
136
 
# File 'lib/active_model/validator.rb', line 134

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.



166
167
 
# File 'lib/active_model/validator.rb', line 166

def check_validity!
end

#validate(record) ⇒ Object

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



149
150
151
152
153
154
155
 
# File 'lib/active_model/validator.rb', line 149

def validate(record)
  attributes.each do |attribute|
    value = record.read_attribute_for_validation(attribute)
    next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank])
    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) 


159
160
161
 
# File 'lib/active_model/validator.rb', line 159

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