Class: DatastaxRails::Validations::UniquenessValidator

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

Overview

Uniqueness validation

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ UniquenessValidator

Returns a new instance of UniquenessValidator


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# File 'lib/datastax_rails/validations/uniqueness.rb', line 7

def initialize(options)
  super
end

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object


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# File 'lib/datastax_rails/validations/uniqueness.rb', line 11

def validate_each(record, attribute, value)
  return true if options[:allow_blank] && value.blank?

  attr_to_check = options[:untokenized_attr] || attribute
  # XXX: I really want this error to show at load time, but I can't figure out how to find
  #      the class from the above initializer.
  if record.column_for_attribute(attr_to_check) && record.column_for_attribute(attr_to_check).options['tokenized']
    fail DatastaxRails::InvalidValidationError, "Cannot specify uniqueness on a tokenized field: #{attr_to_check}"
  end

  # XXX: The following will break if/when abstract base classes
  #      are implemented in datastax_rails (such as STI)
  finder_class = record.class

  scope = finder_class.where(attr_to_check => value)
  scope = scope.where_not(id: record.id) if record.persisted?

  Array.wrap(options[:scope]).each do |scope_item|
    scope_value = record.send(scope_item)
    scope_value = nil if scope_value.blank?
    scope = scope.where(scope_item => scope_value)
  end

  if scope.exists? # rubocop:disable Style/GuardClause
    message = options[:message] || 'has already been taken'
    record.errors.add(attribute, message, options.except(:case_sensitive, :scope).merge(value: value))
  end
end