code: public function populateRelation($name, $records)
      {
          foreach ($this->_relationsDependencies as &$relationNames) {
              unset($relationNames[$name]);
          }
  
          $this->_related[$name] = $records;
      }
docs: Populates the named relation with the related records.
  Note that this method does not check if the relation exists or not.
  @param string $name the relation name, e.g. `orders` for a relation defined via `getOrders()` method (case-sensitive).
  @param ActiveRecordInterface|array|null $records the related records to be populated into the relation.
  @see getRelation()