src/SchemaAnalyzer.php
public function getParentRelationship($tableName)
    {
        return $this->fromCache($this->cachePrefix.'_parent_'.$tableName, function () use ($tableName) {
            return $this->getParentRelationshipWithoutCache($tableName);
        });
    }
public function getParentRelationship($tableName)
    {
        return $this->fromCache($this->cachePrefix.'_parent_'.$tableName, function () use ($tableName) {
            return $this->getParentRelationshipWithoutCache($tableName);
        });
    }
public function getParentRelationship ( $ tableName ) { return $ this -> fromCache ( $ this -> cachePrefix . '_parent_' . $ tableName , function ( ) use ( $ tableName ) { return $ this -> getParentRelationshipWithoutCache ( $ tableName ) ; } ) ; }
If this table is pointing to a parent table (if its primary key is a foreign key pointing on another table),
this function will return the pointed table.
This function will return null if there is no parent table.

@param string $tableName

@return ForeignKeyConstraint|null
If this table is pointing to a parent table ( if its primary key is a foreign key pointing on another table ) this function will return the pointed table . This function will return null if there is no parent table .