Can I place pointer (as value for some key) inside field with object type?

Client SDKs JavaScript SDK
1

I need a field, that contains one pointer. Pointer type is not suitable cuz pointer may be for different entities, so I thought about Array or Object. For me it will be no matter which except theoretical performance when search by this field.

As to Array - it’s simple, I can see in a dashboard pointer as object with type pointer and className.
But in case with Object field - there is only key objectId:
{ "pointerKey": { "objectId": "gmMepz8C06" } }

So pointers only for Pointer, Array or relations?

If for search query with Object I could use
equalTo('fieldName.pointerKey', pointer)
then what can I use with Array - equalTo('fieldName', [pointer]) ?
May be 'fieldName[0]'?

2

I’d go with an object column. You can have something like this stored in each of your rows:

{ "className": "SomeClass", "objectId": "someobjectid" }

, then you can find using:

query.equalTo('fieldName.className','SomeClass'')
query.equalTo('fieldName. objectId','someobjectid'')
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3

Has it any advantages before using Array field?

Or before

query.equalTo('fieldName', { "className": "SomeClass", "objectId": "someobjectid" })

Is that matter of performance?

4

I am not sure regarding the performance but I believe both queries will have about the same performance. I suggested object (and not array) because I understood you needed to store only one pointer per row. You can use array as well and these queries should also work.

5

In mongo we can do

The following example queries for all documents where tags is an array that contains the string "red" as one of its elements:

const cursor = db.collection('inventory').find({ tags: 'red' });

May be with array field in parse query I can use something like this
equalTo('fieldName', pointer)
instead of equalTo('fieldName', [pointer]) or equalTo('fieldName.0', pointer)

6

Yes. You can do

equalTo('fieldName', pointer)
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7

Take a look at this doc: https://docs.parseplatform.org/js/guide/#using-an-array

8

You will probably not be able to use the include because you will have pointers to different classes, but the other features should work for your case.

1 Like
9

Hi guys, does anyone know how to do this same filter being that in Java (android) ?

I open this quest,
https://community.parseplatform.org/t/filter-in-java-android-with-parsequery-field-type-pointer/1719
tks