Class: NestedAttributesUniquenessValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/nested_attributes_validator/active_model/validations/nested_attributes_uniqueness_validator.rb

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, values) ⇒ Object 



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# File 'lib/nested_attributes_validator/active_model/validations/nested_attributes_uniqueness_validator.rb', line 3

def validate_each(record, attribute, values)
  fields = ([options[:fields]] || [:self]).flatten.map(&:to_s)

  # detect duplicated values
  h = values.inject({}){|ret, v| ret[v] = fields.map{|f| v.send(f)}; ret}
  if options[:ignore_nil]
    h = h.reject{|k, v| v.all?(&:nil?)}
  end
  duplicated_values = h.group_by{|k ,v| v}.values.select{|a| a.size>1}.flatten(1).to_h.keys

  # set errors
  duplicated_values.each do |value|
    fields.each do |field|
      # set error to the parent record
      attribute_name = :"#{attributes.first}.#{options[:display_field] || field}"
      record.errors[attribute_name] << I18n.t('errors.messages.nested_attributes_not_unique')
      record.errors[attribute_name].uniq!

      # also set error to the child record to apply "field_with_errors"
      value.errors.add(field , nil)
    end
  end
end