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.

[View source]

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.

[View source]

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.

[View source]

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)
[View source]

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