Need a way to reset Realm db Models

[somasekharkakarla]

Problem

Currently we have deleteAll() method in realm which help use to delete all models from realm. But there are N number of use case where we need a way to reset the db instead deleting the models. By now, we can only do it a way getting all objects and delete it.
But we need a way to reset the model without we do all this.

For example: if a user change from one region to another. We need to remove all pref and data from the region and add new data. If we use deleteAll() it also losing the it reference which causing errors.

Solution

Implementation of resetAll() and reset(['Model1', 'Model2']) which helps to reset data instead of calling a objects of all models and deleting it.

Alternatives

No response

How important is this improvement for you?

Would be a major improvement

Feature would mainly be used with

Local Database only

[takameyer]

@somasekharkakarla Can you clarify what you mean by "reset"? Currently you can use realm.delete to remove any data as you see fit without blowing away the entire database. I'm unsure how a "reset" would differ from a "delete".

[somasekharkakarla]

Hi @takameyer,

For an example:

we have 5 models
Model 1, Model 2, Model 3, Model 4, Model 5

if we want to clear the object in these Models

const model1Objects = realm.objects('Model 1')
realm.delete(model1Objects)
const model2Objects = realm.objects('Model 2')
realm.delete(model2Objects)
const model3Objects = realm.objects('Model 3')
realm.delete(model3Objects)
const model4Objects = realm.objects('Model 4')
realm.delete(model4Objects)
const model5Objects = realm.objects('Model 5')
realm.delete(model5Objects)

Now all Objects are deleted in the model which i call a reset of model
what if we have 20 models
we will have 40 lines

if we can introduce reset(['Model1', 'Model2']) and resetAll() function. we can achieve it very fast instead of writing long code

now code will be
if i want to reset only two models
realm.reset([Model 1, Model 2])

if i want to reset all
just
realm.resetAll()

[takameyer]

@somasekharkakarla it's an interesting idea, but very specialized. You could write these as helper functions in your own application:

function resetRealmModels(models, realm){
  for( const model of models ){
    realm.delete(realm.objects(model));
  }
}

I don't see how realm.resetAll() is any different than realm.deleteAll()

[somasekharkakarla]

Delete all will delete including Model. No model will be there in db right. Yes i can write a helper function. Its not that important but just if we have one it will great

[somasekharkakarla]

And also @takameyer can you please look into it
#5864

[kneth]

We can create small aux. methods for reset and resetAll e.g.,

resetAll() =>  this.schema.forEach((s) => this.delete(this.objects(s.name)); 

[somasekharkakarla]

Great

[somasekharkakarla]

Hi @kneth
resetAll() => this.schema.forEach((s) => this.delete(this.objects(s.name));
i am using as you defined. it working but not every time.
if there is large data this.delete(this.objects(s.name) is taking time . And there is no way i can know that objects are deleted. Due this, reseting DB is causing the issue. Please add patch to delete to return a promise on delete

[somasekharkakarla]

Hi @kneth , any update on this?