Enabling null on many FKs to same associated table - php

Question

I have multiple fields setup as FK to the same table. The FK can also be NULL.
I keep getting this error:
ExistsIn rule for 'late_agreement_exception_outcome_recommendation_id' is invalid. 'ExceptionOutcomes' is not associated with 'App\Model\Table\ExceptionsTable'.
Database structure:
exceptions
id,
request_id,
late_agreement_exception_outcome_recommendation_id (FK, exception_outcomes->id)
late_agreement_exception_outcome_id (FK, exception_outcomes->id),
...
exception_outcomes
id,
name
...
Column definition (ie. late_agreement_exception_outcome_recommendation_id):
Column relationship (ie. late_agreement_exception_outcome_recommendation_id):
ExceptionTable:
FK setup to ExceptionOutcomes
$this->belongsTo('LateAgreementExceptionOutcomeRecommendations', [
'class' => 'ExceptionOutcomes',
'foreignKey' => 'late_agreement_exception_outcome_recommendation_id',
'joinType' => 'INNER',
]);
Edited rules attempting to enable entry of a null value for the field value:
$rules->add(
function ($entity, $options) {
$rule = new ExistsIn('late_agreement_exception_outcome_recommendation_id', 'ExceptionOutcomes');
return $entity->late_agreement_exception_outcome_recommendation_id === NULL || $rule($entity, $options);
},
['errorField' => 'late_agreement_exception_outcome_recommendation_id']
);
Update #1
I changed the association name like so:
$rules->add(
function ($entity, $options) {
$rule = new ExistsIn('late_agreement_exception_outcome_recommendation_id', 'LateAgreementExceptionOutcomeRecommendations');
return $entity->late_agreement_exception_outcome_recommendation_id === NULL || $rule($entity, $options);
},
['errorField' => 'late_agreement_exception_outcome_recommendation_id']
);
And got the following issue simply saving the data:
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'sdi_ips2.late_agreement_exception_outcome_recommendations' doesn't exist
Previously, I could save the column when providing a value. However, trying to revert to NULL would cause an issue.
Update #2
try
{
$this->Requests->save($request);
}
catch(Cake\Database\Exception\DatabaseException $e)
{
debug("here!");
exit;
}
Update #3
Here's what I see in the SQL log:
Generated Models
The following Table objects used Cake\ORM\Table instead of a concrete class:
LateAgreementExceptionOutcomeRecommendations

Answer 1

Solution:
Note the className attribute in belongsTo.
$this->belongsTo('LateAgreementExceptionOutcomeRecommendations', [
'className' => 'ExceptionOutcomes',
'foreignKey' => 'late_agreement_exception_outcome_recommendation_id',
'joinType' => 'INNER',
]);