code: public function getChildrenRelationships($tableName)
      {
          return $this->fromCache($this->cachePrefix.'_children_'.$tableName, function () use ($tableName) {
              return $this->getChildrenRelationshipsWithoutCache($tableName);
          });
      }
docs: If this table is pointed by children tables (if other child tables have a primary key that is also a
  foreign key to this table), this function will return the list of child tables.
  This function will return an empty array if there are no children tables.
  
  @param string $tableName
  
  @return ForeignKeyConstraint[]