Class ExistsIn
Checks that the value provided in a field exists as the primary key of another table.
Properties summary
-  $_fieldsprotectedThe list of fields to checkarray
-  $_repositoryprotectedThe repository where the field will be looked forarray
Method Summary
-  __construct() publicConstructor.
-  __invoke() publicPerforms the existence check
-  _fieldsAreNull() protectedCheck whether or not the entity fields are nullable and null.
Method Detail
__construct()source public
__construct( string|array $fields , object|string $repository )
Constructor.
Parameters
-  string|array $fields
- The field or fields to check existence as primary key.
-  object|string $repository
- The repository where the field will be looked for, or the association name for the repository. 
__invoke()source public
__invoke( Cake\Datasource\EntityInterface $entity , array $options )
Performs the existence check
Parameters
-  Cake\Datasource\EntityInterface$entity
- The entity from where to extract the fields
-  array $options
- Options passed to the check, where the - repositorykey is required.
Returns
booleanThrows
RuntimeExceptionWhen the rule refers to an undefined association.
_fieldsAreNull()source protected
_fieldsAreNull( Cake\Datasource\EntityInterface $entity , Cake\ORM\Table $source )
Check whether or not the entity fields are nullable and null.
Parameters
-  Cake\Datasource\EntityInterface$entity
- The entity to check.
-  Cake\ORM\Table$source
- The table to use schema from.
Returns
booleanProperties detail
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    http://api.cakephp.org/3.2/class-Cake.ORM.Rule.ExistsIn.html