Angularfire: Feature request: support `array-contains`

[davidtlee]

It looks like firestore now supports array_contains query functionality:

https://firebase.google.com/support/release-notes/js

This would be super useful for reducing the querying needed. For example if I need to get all the comments for a list of N posts, this would N individual queries. With array-contains, you could get them all in one query!

[davideast]

Hi @davidtlee! We support this already in the query callback.

[Matttaylor8910]

Hi @davideast, could you give an example or point to documentation?

Using 'array-contains' within the where clause throws the following error:

[ts] Argument of type '"array-contains"' is not assignable to parameter of type 'WhereFilterOp'.

This is the code I'm trying to use with version 5.0.0-rc.11 of angularfire2:
return this.afs.collection('games', ref => { return ref .orderBy('timestamp') .where('playerIds', 'array-contains', uid) .limit(30); })

[leonlovett]

@Matttaylor8910 I had the same issue. Searching does work as David East says, but for some reason the typings weren't correct for me locally. I had to edit the typings file for firebase, then the app started building again.

Open node_modules/firebase/index.d.ts to line 1543 and added 'array-contains' to the type WhereFilterOp.

[davidtlee]

@davideast thanks! it does look like it works. But I realized I was reading it wrong. I thought array-contains allows passing in an array for matching anything within the array. But I realized it only allows passing in a single value and checking if an array on the backend contains the query item. whoops!

[davideast]

@leonlovett If you update to the latest Firebase version the typings should work

[gtcdevop]

I manage to solve this issue using the following dependencies version

{
// all Angular deps on version 5.0.3
...
 "angularfire2": "5.0.0-rc.6",
 "rxjs": "5.5.4",
 "firebase": "5.3.0",
 "@firebase/app": "0.1.10",
...
}

[yogeshdakre]

array-contains only work with string?? the examples which are given shows that it works with string but how to deal when array contains objects
/mycollection
/array +{name:'yogi'},
{name:'yogi1'},
{name:'yogi2'}

here how the query will be for object with name==yogi?
this.afs
.collection('userroutes', ref =>
{ return ref.where('mycollection','array-contains','name==yogi') } //where we should put the condtion
)
.valueChanges()
.subscribe(data => {
//data is empty
});

[hiepxanh]

Hi everyone, I just find out that a little different here: array-contains and array_contains

should we update this for consistance @davideast

[choopage]

@hiepxanh for consistency, I think we should update this to array_contains.

[IchordeDionysos]

array-contains is indeed consistent across platforms only the Python SDK seems to use the underscore version and as well in the docs it's everywhere mentioned with an underscore.