Class: DataMapper::Validate::UniquenessValidator

Inherits:
GenericValidator show all
Includes:
Extlib::Assertions
Defined in:
lib/dm-validations/uniqueness_validator.rb

Overview

Author:

  • Guy van den Berg

Since:

  • 0.9

Instance Attribute Summary

Attributes inherited from GenericValidator

#if_clause, #unless_clause

Instance Method Summary collapse

Methods inherited from GenericValidator

#==, #add_error, #execute?, #field_name

Constructor Details

#initialize(field_name, options = {}) ⇒ UniquenessValidator

Returns a new instance of UniquenessValidator.

Since:

  • 0.9



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# File 'lib/dm-validations/uniqueness_validator.rb', line 11

def initialize(field_name, options = {})
  assert_kind_of 'scope', options[:scope], Array, Symbol if options.has_key?(:scope)
  super
  @field_name, @options = field_name, options
end

Instance Method Details

#call(target) ⇒ Object

Since:

  • 0.9



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# File 'lib/dm-validations/uniqueness_validator.rb', line 17

def call(target)
  scope = Array(@options[:scope])

  return true if @options[:allow_nil] && target.send(field_name).nil?

  repository_name = target.repository.name

  opts = {
    :fields    => target.model.key,
    field_name => target.validation_property_value(field_name)
  }

  scope.each do |item|
    if target.model.properties(repository_name).has_property?(item)
      opts[item] = target.validation_property_value(item)
    elsif target.model.relationships(repository_name).has_key?(item)
      target.validation_association_keys(item).each do |key|
        opts[key] = target.validation_property_value(key)
      end
    end
  end

  resource = repository(repository_name) { target.model.first(opts) }

  return true if resource.nil?

  # is target and found resource identic? same instance... but not ==
  return true if !target.new_record? && resource.repository.name == repository_name && resource.model == target.model && resource.key == target.key

  error_message = @options[:message] || "%s is already taken".t(Extlib::Inflection.humanize(field_name))
  add_error(target, error_message , field_name)

  return false
end