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.
| [R] | attributes |
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.
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# File activemodel/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.
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# File activemodel/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.
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# File activemodel/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.
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# File activemodel/lib/active_model/validator.rb, line 160
160: def validate_each(record, attribute, value)
161: raise NotImplementedError
162: end