Class: Hydra::Validations::UniquenessValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Includes:
Cardinality
Defined in:
lib/hydra/validations/uniqueness.rb

Overview

UniquenessValidator - an ActiveFedora model validator

Usage:

validates :field, uniqueness: { solr_name: "field_ssim" }
validates_uniqueness_of :field, solr_name: "field_ssim"

Restrictions:

  • Accepts only one attribute (can have more than one UniquenessValidator on a model, however)

  • :solr_name option must be present

  • Can be used on enumerable values (attribute defined with :multiple=>true option), but validator also validates single cardinality, so will not pass validation if enumerable has more than one member.

CAVEAT: The determination of uniqueness depends on a Solr query. False negatives (record invalid) may result if, for example, querying a Solr field of type “text”.

Instance Method Summary collapse

Methods included from Cardinality

#validate_cardinality, #validate_single_cardinality

Instance Method Details

#check_validity! ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/hydra/validations/uniqueness.rb', line 30

def check_validity!
  raise ArgumentError, "UniquenessValidator accepts only a single attribute: #{attribues}" if attributes.length > 1 
  raise ArgumentError, "UniquenessValidator requires the :solr_name option be present." unless options[:solr_name].present?
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/hydra/validations/uniqueness.rb', line 35

def validate_each(record, attribute, value)
  # TODO: i18n messages
  validate_cardinality(:single, record, attribute, value)
  # Validate uniqueness proper only if value is of single cardinality
  return if record.errors.added?(attribute, "can't have more than one value") 
  value = value.first if value.respond_to?(:each)
  conditions = {options[:solr_name] => value}
  conditions.merge!("-id" => record.id) if record.persisted?
  record.errors.add attribute, "has already been taken" if record.class.exists?(conditions)
end