How do I resolve a callback error with 'callback' is an instance of Object)? - react-native

Question

TypeError: callback is not a function. (In 'callback(data)',
'callback' is an instance of Object)
The code here works just fine when I write it like this:
const onSelectFilterDone = (filter) => {
setFilter(filter);
setFilterModalVisible(false);
unsubscribe.current = listingsAPI.subscribeListings(
{ categoryId: category.id },
// { categoryId2: category2.id },
favorites,
onListingsUpdate,
);
};
When i uncomment that other line, it breaks and gives me this error.
const onSelectFilterDone = (filter) => {
setFilter(filter);
setFilterModalVisible(false);
unsubscribe.current = listingsAPI.subscribeListings(
{ categoryId: category.id },
{ categoryId2: category2.id },
favorites,
onListingsUpdate,
);
};
Here is the relevant snippet from listingsAPI (below) if it helps but this code works fine when there is only one object. Is there a specific way to make this work with two objects like above?
if (categoryId) {
return (
listingsRef
.where('categoryID', '==', categoryId)
.where('isApproved', '==', isApproved)
.onSnapshot((querySnapshot) => {
const data = [];
querySnapshot.forEach((doc) => {
const listing = doc.data();
if (favorites && favorites[doc.id] === true) {
listing.saved = true;
}
data.push({ ...listing, id: doc.id });
});
callback(data);
})
);
}
if (categoryId2) {
return (
listingsRef
.where('categoryID2', '==', categoryId2)
.where('isApproved', '==', isApproved)
.onSnapshot((querySnapshot) => {
const data = [];
querySnapshot.forEach((doc) => {
const listing = doc.data();
if (favorites && favorites[doc.id] === true) {
listing.saved = true;
}
data.push({ ...listing, id: doc.id });
});
callback(data);
})
);
}

Answer 1

You can combine your queries via this way if you want to have it optional:
let query = listingsRef.where('isApproved', '==', isApproved)
if (categoryId) {
query = query.where('categoryID', '==', categoryId)
}
if (categoryId2) {
query = query.where('categoryID2', '==', categoryId2)
}
query.onSnapshot...