Class: UniquenessValidator

Inherits:
ActiveRecord::Validations::UniquenessValidator
  • Object
show all
Defined in:
lib/uniqueness_validator.rb

Instance Method Summary collapse

Instance Method Details

#setup(klass) ⇒ Object 



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# File 'lib/uniqueness_validator.rb', line 2

def setup(klass)
  super
  @klass = options[:model] if options[:model]
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/uniqueness_validator.rb', line 7

def validate_each(record, attribute, value)
  # UniquenessValidator can't be used outside of ActiveRecord instances, here
  # we return the exact same error, unless the 'model' option is given.
  if ! options[:model] && ! record.class.ancestors.include?(ActiveRecord::Base)
    raise ArgumentError, "Unknown validator: 'UniquenessValidator'"

  # If we're inside an ActiveRecord class, and `model` isn't set, use the
  # default behaviour of the validator.
  elsif ! options[:model]
    super

  # Custom validator options. The validator can be called in any class, as
  # long as it includes `ActiveModel::Validations`. You can tell the validator
  # which ActiveRecord based class to check against, using the `model`
  # option. Also, if you are using a different attribute name, you can set the
  # correct one for the ActiveRecord class using the `attribute` option.
  else
    record_org, attribute_org = record, attribute

    attribute = options[:attribute].to_sym if options[:attribute]

    if options[:model]
      record = options[:model].new(attribute => value)
    else
      model_name = options.fetch(:model_name) { record_org.class.to_s.downcase.split('::').last.gsub(/form$/, '') }
      record = record_org.send(model_name)
    end
    record = record_org.send(options[:model].to_s.downcase)

    super

    if record.errors[attribute_org].any?
      record_org.errors.add(attribute_org, :taken,
        options.except(:case_sensitive, :scope).merge(value: value))
    end
  end
end