toJson method
Implementation
Map<String, Object?> toJson() => {
'name': name,
'columns': columns,
'references': {'table': referencedTable, 'columns': referencedColumns},
if (onDelete != ReferenceAction.noAction) 'onDelete': onDelete.name,
if (onUpdate != ReferenceAction.noAction) 'onUpdate': onUpdate.name,
};