What causes these queries to function separately but fail when combined?

I am facing an issue with combining 2 queries in my Firestore collection.

These are the 2 examples that work:

database
  .collection('servicebonnen')
  .where('medewerker', '==', 'CEES')

and:

database
  .collection('servicebonnen')
  .where('date', '>', this.today)
  .where('date', '<', this.tomorrow)

However, why does combining these queries not work as expected?:

database
  .collection('servicebonnen')
  .where('medewerker', '==', 'CEES')
  .where('date', '>', this.today)
  .where('date', '<', this.tomorrow)
javascriptfirebasevue.jsgoogle-cloud-firestore

Answer №1

As stated in the Firebase Firestore documentation:

To make more specific queries (logical AND), you can chain multiple where() methods together. However, when combining the equality operator (==) with a range or array-contains clause (<, <=, >, >=, or array_contains), it's important to create a composite index.

In your scenario, creating a composite index is necessary.

Answer №2

After hearing from @hkchakladar, it became evident that adding a composite index was necessary in order to produce results for non-default queries.

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