class ActiveRecord::Validations::UniquenessValidator

Public Instance Methods

validate_each(record, attribute, value) click to toggle source
# File lib/composite_primary_keys/validations/uniqueness.rb, line 4
def validate_each(record, attribute, value)
  finder_class = find_finder_class_for(record)
  value = map_enum_attribute(finder_class, attribute, value)

  relation = build_relation(finder_class, attribute, value)
  if record.persisted?
    # CPK
    if finder_class.primary_key.is_a?(Array)
      predicate = finder_class.cpk_id_predicate(finder_class.arel_table, finder_class.primary_key, record.id_in_database || record.id)
      relation = relation.where.not(predicate)
    elsif finder_class.primary_key
      relation = relation.where.not(finder_class.primary_key => record.id_in_database)
    else
      raise UnknownPrimaryKey.new(finder_class, "Can not validate uniqueness for persisted record without primary key.")
    end
  end
  relation = scope_relation(record, relation)
  if options[:conditions]
    conditions = options[:conditions]

    relation = if conditions.arity.zero?
      relation.instance_exec(&conditions)
    else
      relation.instance_exec(record, &conditions)
    end
  end

  if relation.exists?
    error_options = options.except(:case_sensitive, :scope, :conditions)
    error_options[:value] = value

    record.errors.add(attribute, :taken, **error_options)
  end
end