function relation_query_enforce_distinct_endpoints_alter in Relation 7

Same name and namespace in other branches

1. 8.2 relation.module \relation_query_enforce_distinct_endpoints_alter()
2. 8 relation.module \relation_query_enforce_distinct_endpoints_alter()

Implements hook_query_TAG_alter().

Adds conditions to query to ensure different r_index for each endpoint.

File

./relation.module, line 557

Describes relations between entities.

Code

function relation_query_enforce_distinct_endpoints_alter(QueryAlterableInterface $query) {

  // Get arity of the query
  $relation_query = $query
    ->getMetaData('entity_field_query');
  foreach ($relation_query->propertyConditions as $condition) {
    if ($condition['column'] == 'arity') {
      $arity = $condition['value'];
      break;
    }
  }

  // Add r_index conditions between all endpoints
  for ($i = 0; $i < $arity; $i++) {
    for ($k = $i + 1; $k < $arity; $k++) {
      $column_left = 'field_data_endpoints_delta_' . $i . '.endpoints_r_index';
      $column_right = 'field_data_endpoints_delta_' . $k . '.endpoints_r_index';
      $query
        ->where("{$column_left} != {$column_right}");
    }
  }
}