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DataMapper::Validations::UniquenessValidator

@author Guy van den Berg @since 0.9

Public Class Methods

new(field_name, options = {}) click to toggle source
# File lib/dm-validations/validators/uniqueness_validator.rb, line 9
def initialize(field_name, options = {})
  if options.has_key?(:scope)
    assert_kind_of('scope', options[:scope], Array, Symbol)
  end

  super

  set_optional_by_default
end

Public Instance Methods

call(target) click to toggle source
# File lib/dm-validations/validators/uniqueness_validator.rb, line 19
def call(target)
  return true if valid?(target)

  error_message = @options[:message] || ValidationErrors.default_error_message(:taken, field_name)
  add_error(target, error_message, field_name)

  false
end
valid?(target) click to toggle source
# File lib/dm-validations/validators/uniqueness_validator.rb, line 28
def valid?(target)
  value = target.validation_property_value(field_name)
  return true if optional?(value)

  opts = {
    :fields    => target.model.key(target.repository.name),
    field_name => value,
  }

  Array(@options[:scope]).each { |subject|
    unless target.respond_to?(subject)
      raise(ArgumentError,"Could not find property to scope by: #{subject}. Note that :unique does not currently support arbitrarily named groups, for that you should use :unique_index with an explicit validates_uniqueness_of.")
    end

    opts[subject] = target.__send__(subject)
  }

  resource = DataMapper.repository(target.repository.name) do
    target.model.first(opts)
  end

  return true if resource.nil?
  target.saved? && resource.key == target.key
end

[Validate]

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