toJson method
Implementation
Map<String, dynamic> toJson() {
return {
"source_entity_id": sourceEntityId,
"target_entity_id": targetEntityId,
"relationship_type": relationshipType,
"description": description,
"created_at": createdAt,
"valid_at": validAt,
"expired_at": expiredAt,
"invalid_at": invalidAt,
};
}