Realm-js: Support IN queries

[sunglee]

Let's say I have the following sample data:

[
  { id: 1, value: 'something' },
  { id: 2, value: 'something' },
  { id: 3, value: 'something' },
  { id: 4, value: 'something' },
  { id: 5, value: 'something' },
  { id: 6, value: 'something' },
  { id: 7, value: 'something' },
  { id: 8, value: 'something' },
  { id: 9, value: 'something' },
  { id: 10, value: 'something' },
]

When I execute the following:

let filtered1 = sample.filtered('id > 5')

it returns one Results object with 5 filtered values like this:

// value of filtered1 in console
Results {-1: undefined, Symbol(): 2, Symbol(): 8, Symbol(): "results"}

However, my question is how I can filter random ids? For example, I want to filter ids of 2, 4, 7, and 10.
What I can think of is:

let filtered2 = [2,4,7,10].map( (id) => {
   return sample.filtered('id == $0', id);
})

But the problem here is it returns an array of 4 Results objects, not the single Results object.

// value of filtered2 in console
[Results, Results, Results, Results]

Is it possible to get the results like the filtered1 in the second case?

[alazier]

At some point we will support a syntax for this type of query. Something like:

let filtered = sample.filtered('id IN [2, 4, 7, 10]')

Unfortunately we don't yet support this so for now you will have to generate a query to do this yourself.

[alazier]

Here is a code snippet that should generate the query you want to run:

var filtered = sample.filtered([2,4,7,10].map((id) => 'id == ' + id).join(' OR '));

This should create a query of the form id == 2 OR id == 4 OR id == 7 OR id ==10. Once we support IN queries it will do this for you internally.

[sunglee]

Thank you. It works with join. Maybe IN queries capability could be really helpful. Thanks again. 👍

[alazier]

Leaving this open until we add IN support.

[Arman92]

Looking forward to see IN condition support in realm js :-)

[dzuncoi]

@alazier Do you have roadmap for this feature yet?

[kristiandupont]

@dzuncoi There are a number of query tasks we want to look into and hopefully soon, but no timeline yet, sorry.

[dzuncoi]

@kristiandupont No problem, just want to know the timeline, I'm still fine with current query syntax :)

[stephanejais]

My collection contains strings, which I'd like to quote while building the query. Didn't find a quote() function. Is there one ?

[Unforgiven-wanda]

@alazier Hello,
I believe the syntax for Realm-js has changed since your answer. How would I adapt your answer since now you have to write a query like so:

sample.filtered('Id == $0', someVariable)

To an array?
And is there any progress on an "IN" predicate?
Thank you.

[donni106]

Any updates for supporting IN queries?

[Unforgiven-wanda]

@donni106
Try something like this:

import RealmQuery from 'realm-query';

let items = RealmQuery
                      .where(realm.objects('superlist'))
                      .in('Id', ids) //ids here being an array
                      .findAll();

[juanfer0002]

Any update on IN operator?

[kneth]

Tracked in https://github.com/realm/realm-core/issues/2978

[abhishekmatta999]

Is it possible to make aggregation(joins) between two collections in realm Database?