Firestore Failed to merge array of items to another array using FieldValue.arrayUnion()

Question

I have a cloud function that invoked when a certain event happened. In the function i will get an array of string for example let h:string[] = ["foo","bar","baz"] something similar to this when I try to update an array field inside my document like this names: admin.firestore.FieldValue.arrayUnion(h) it failed to do that and throw that error in the console

Error: 3 INVALID_ARGUMENT: Cannot convert an array value in an array value.
    at Object.exports.createStatusError (/srv/node_modules/grpc/src/common.js:87:15)
    at Object.onReceiveStatus (/srv/node_modules/grpc/src/client_interceptors.js:1188:28)
    at InterceptingListener._callNext (/srv/node_modules/grpc/src/client_interceptors.js:564:42)
    at InterceptingListener.onReceiveStatus (/srv/node_modules/grpc/src/client_interceptors.js:614:8)
    at callback (/srv/node_modules/grpc/src/client_interceptors.js:841:24)

But if i changed the code to this names: admin.firestore.FieldValue.arrayUnion("foo","bar","baz") it works but in my function, i receive an array not the above format so it fails

Here is what I want. I have an array field in the document let call it names. when the function is triggered and I get the array from it. I want to add this array to the existing names array

before adding the array names : ["test","test2"]

after adding the array names : ["test","test2","foo","bar","baz"]

How to fix that? I'm using typescript 3.0.1

Not quite following but if admin.firestore.FieldValue.arrayUnion("foo","bar","baz") works then admin.firestore.FieldValue.arrayUnion.apply(null,h) should also work. — Uzer
– Uzer, Commented Aug 30, 2018 at 16:38
if names=["test","test2"] and otherArray=["foo","bar","baz"] then names.concat(otherArray) would be ["test","test2","foo","bar","baz"] — Uzer
– Uzer, Commented Aug 30, 2018 at 16:43
The first one worked! Thank you very much you saved my day :) — Ahmed Abdelmeged
– Ahmed Abdelmeged, Commented Aug 30, 2018 at 16:50
I've written it up as an answer. If it was helpful then please mark my answer as the solution. — Uzer
– Uzer, Commented Aug 30, 2018 at 16:58

David Fernando Chaves Tamayo · Accepted Answer · 2019-04-03 21:38:02Z

5

The arrayUnion function have a array value on definition, you need add your array to this array value, on javascript or type you can use ...(NameArray) to union.

items : any[] = [1,2,4,5,67,8];
admin.firestore.FieldValue.arrayUnion(...items);

edited Apr 3, 2019 at 21:38

answered Apr 3, 2019 at 20:46

David Fernando Chaves Tamayo

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1 Comment

Nick Over a year ago

Welcome to SO. It's always useful to add some explanation why your code answers the question.

Uzer · Accepted Answer · 2018-08-30 17:03:14Z

4

If admin.firestore.FieldValue.arrayUnion("foo","bar","baz") works then we can use a function called apply which exists as an object member on every function... It's a very useful one to know. Apply 'applys' a single array of arguments to the function (rather than comma separated arguments) and invokes it.

Hence the solution is:

admin.firestore.FieldValue.arrayUnion.apply(null,h)

edited Aug 30, 2018 at 17:03

answered Aug 30, 2018 at 16:56

Uzer

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