Flutter Firestore Query Field in Object - firebase

Question

I'm writing a Flutter app and am trying to add documents to a list, where the contractorUserId value field (under jobBids) in Firestore is equal to the logged-in user. The image below shows the structure of my Firestore structure (contractorUserId in jobBids)
Firestore database
I'm using the following code:
_jobsCollectionReference.snapshots().listen((jobBidsSnapshot) {
if (jobBidsSnapshot.docs.isNotEmpty) {
var jobsWithBids = jobBidsSnapshot.docs
.map((jobBidsSnapshot) =>
JobWithBids.fromMap(jobBidsSnapshot.data(), jobBidsSnapshot.id))
.where((mappedItem) => mappedItem.jobBids != null)
.where((mappedItem) =>
mappedItem.jobBids
.map((e) => e.contractorUserId == loggedInUser.uid)
.toList()
.length >
0)
.toList();
This code results in a list with all objects where the contractorUserId field exists. However, the intention was to only add the documents where the contractorUserId is equal to the Logged in user.
Does anyone know what I'm doing wrong?

Answer 1

You're getting the error because the piece of code below evaluates to true since you're just checking the length of the list even if e.contractorUserId == loggedInUser.uid equals false :
mappedItem.jobBids
.map((e) => e.contractorUserId == loggedInUser.uid)
.toList()
.length >
0
So your code is actually:
var jobsWithBids = jobBidsSnapshot.docs
.map((jobBidsSnapshot) =>JobWithBids.fromMap(jobBidsSnapshot.data(), jobBidsSnapshot.id))
.where((mappedItem) => mappedItem.jobBids != null)
.where((mappedItem) => true) //This is what it evaluates to
.toList();
You should switch map to where in the last check, so it filters any list that does not satisfy the condition. See below:
var jobsWithBids = jobBidsSnapshot.docs
.map((jobBidsSnapshot) =>JobWithBids.fromMap(jobBidsSnapshot.data(), jobBidsSnapshot.id))
.where((mappedItem) => mappedItem.jobBids != null)
.where((mappedItem) => mappedItem.jobBids
.where((e) => e.contractorUserId == loggedInUser.uid)
.toList()
.length > 0
)
.toList();