Class: ActiveRecord::Validations::UniquenessValidator

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

Overview

:nodoc:

Instance Attribute Summary

Attributes inherited from ActiveModel::EachValidator

#attributes

Attributes inherited from ActiveModel::Validator

#options

Instance Method Summary collapse

Methods inherited from ActiveModel::EachValidator

#check_validity!, #validate

Methods inherited from ActiveModel::Validator

kind, #kind, #validate

Constructor Details

#initialize(options) ⇒ UniquenessValidator

Returns a new instance of UniquenessValidator.


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# File 'activerecord/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))
  @klass = options[:class]
end

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object


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

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

  begin
    relation = build_relation(finder_class, table, attribute, value)
    if record.persisted?
      if finder_class.primary_key
        relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.id))
      else
        raise UnknownPrimaryKey.new(finder_class, "Can not validate uniqueness for persisted record without primary key.")
      end
    end
    relation = scope_relation(record, table, relation)
    relation = finder_class.unscoped.where(relation)
    relation = relation.merge(options[:conditions]) if options[:conditions]
  rescue RangeError
    relation = finder_class.none
  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