Class: ActiveRecord::Validations::UniquenessValidator
- Inherits:
-
ActiveModel::EachValidator
- Object
- ActiveModel::EachValidator
- ActiveRecord::Validations::UniquenessValidator
- Defined in:
- lib/active_record/validations/uniqueness.rb
Overview
:nodoc:
Instance Method Summary collapse
-
#initialize(options) ⇒ UniquenessValidator
constructor
A new instance of UniquenessValidator.
- #validate_each(record, attribute, value) ⇒ Object
Constructor Details
#initialize(options) ⇒ UniquenessValidator
Returns a new instance of UniquenessValidator.
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# File 'lib/active_record/validations/uniqueness.rb', line 6 def initialize() if [:conditions] && ![:conditions].respond_to?(:call) raise ArgumentError, "#{[:conditions]} was passed as :conditions but is not callable. " \ "Pass a callable instead: `conditions: -> { where(approved: true) }`" end unless Array([:scope]).all? { |scope| scope.respond_to?(:to_sym) } raise ArgumentError, "#{[:scope]} is not supported format for :scope option. " \ "Pass a symbol or an array of symbols instead: `scope: :user_id`" end super @klass = [:class] @klass = @klass.superclass if @klass.singleton_class? end |
Instance Method Details
#validate_each(record, attribute, value) ⇒ Object
[View source]
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# File 'lib/active_record/validations/uniqueness.rb', line 20 def validate_each(record, attribute, value) finder_class = find_finder_class_for(record) value = map_enum_attribute(finder_class, attribute, value) return if record.persisted? && !validation_needed?(finder_class, record, attribute) relation = build_relation(finder_class, attribute, value) if record.persisted? if finder_class.primary_key relation = relation.where.not(finder_class.primary_key => [record.id_in_database]) else raise UnknownPrimaryKey.new(finder_class, "Cannot validate uniqueness for persisted record without primary key.") end end relation = scope_relation(record, relation) if [:conditions] conditions = [:conditions] relation = if conditions.arity.zero? relation.instance_exec(&conditions) else relation.instance_exec(record, &conditions) end end if relation.exists? = .except(:case_sensitive, :scope, :conditions) [:value] = value record.errors.add(attribute, :taken, **) end end |