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.
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.
# File lib/active_model/validator.rb, line 140 140: def initialize(options) 141: @attributes = Array.wrap(options.delete(:attributes)) 142: raise ":attributes cannot be blank" if @attributes.empty? 143: super 144: check_validity! 145: end
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 lib/active_model/validator.rb, line 167 167: def check_validity! 168: end
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.
# File lib/active_model/validator.rb, line 150 150: def validate(record) 151: attributes.each do |attribute| 152: value = record.read_attribute_for_validation(attribute) 153: next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank]) 154: validate_each(record, attribute, value) 155: end 156: end
Override this method in subclasses with the validation logic, adding errors to the records errors array where necessary.
# File lib/active_model/validator.rb, line 160 160: def validate_each(record, attribute, value) 161: raise NotImplementedError 162: end
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