Class: ActiveRecord::Validations::UniquenessValidator

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

Overview

:nodoc:

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ UniquenessValidator

Returns a new instance of UniquenessValidator.



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# File 'lib/active_record/validations/uniqueness.rb', line 4

def initialize(options)
  if options[:conditions] && !options[:conditions].respond_to?(:call)
    raise ArgumentError, "#{options[:conditions]} was passed as :conditions but is not callable. " \
                         "Pass a callable instead: `conditions: -> { where(approved: true) }`"
  end
  super({ case_sensitive: true }.merge!(options))
end

Instance Method Details

#setup(klass) ⇒ Object

Unfortunately, we have to tie Uniqueness validators to a class.



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# File 'lib/active_record/validations/uniqueness.rb', line 13

def setup(klass)
  @klass = klass
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/active_record/validations/uniqueness.rb', line 17

def validate_each(record, attribute, value)
  finder_class = find_finder_class_for(record)
  table = finder_class.arel_table
  value = deserialize_attribute(record, attribute, value)

  relation = build_relation(finder_class, table, attribute, value)
  relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.id)) if record.persisted?
  relation = scope_relation(record, table, relation)
  relation = finder_class.unscoped.where(relation)
  relation = relation.merge(options[:conditions]) if options[:conditions]

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

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