Feature: Soft Remove

[alldayalone]

1. Add option { soft: bool } (default false) to the createService options which opts on the feature
2. On remove document makes update { deletedOn: new Date() }
3. Add function restore which makes update { $unset: { deletedOn: "" } }
4. Add option { soft: bool } (default true) to all query methods which adds { deletedOn: { $exists: false } } to the query

To discuss:

• Emit event restored and adjust event removed

[jqueryisamonad]

I think we shouldn't add application specific logic to library. Especially since you can define custom service methods and use them instead of usual methods:

// db.js

db.setServiceMethod('softRemove', (service, query) => {
  return service.atomic.update(
    query,
    { $set: { deletedOn: new Date() } },
    { multi: true },
  );
});

db.setServiceMethod('softRestore', (service, query) => {
  return service.atomic.update(
    query,
    { $unset: { deletedOn: '' } },
    { multi: true },
  );
});

db.setServiceMethod('softFind', (service, query) => {
  return service.find({ ...query, deletedOn: { $exists: false } });
});