toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (createTime != null) 'createTime': createTime!,
if (cursor != null) 'cursor': cursor!,
if (entity != null) 'entity': entity!,
if (updateTime != null) 'updateTime': updateTime!,
if (version != null) 'version': version!,
};