I have some body data coming into firebase functions as a array ['123','hello','34']
I then process it by doing const data = JSON.stringify(['123','hello','34'])
After i update the firestore data by doing a set
set({testData : firestore.FieldValue.arrayUnion(data)})
Problem is, the entire thing is saved as string in firestore
testData: "['123','hello','34']"
Instead of an array.
testData:
0: "123"
1: "hello"
2: "34"
My question is how do i get firestore to save it as an array?
You are converting it to a string by using stringify(). Try refactoring the code as shown below:
docRef.set({ testData : firestore.FieldValue.arrayUnion(...data) })
// use spread operator here ^^^
The documentation (NodeJS) has an example on adding multiple values using arrayUnion.