[Vuejs]-Firestore, vue, vuex, vuexfire: How to make getter actually get data from store?

With your query, which combines a where clause with array-contains and an orderBy clause you need to create an index.

More details in the doc:

• https://firebase.google.com/docs/firestore/query-data/order-limit-data
• https://firebase.google.com/docs/firestore/query-data/queries#in_not-in_and_array-contains-any
• https://firebase.google.com/docs/firestore/query-data/indexing