'query' does not exist in type 'QueryFn' | angularfire2

Question

Argument of type \'{ query: { limitTolast: number; orderByKey: boolean; }; }\' is not assignable to parameter of type \'QueryFn\'.Object literal may only specify known propertie

Answer 1

This will work perfectly. Tried by me

getMessages(): Observable {
    return this.db.list('/messages', ref => 
      let q = ref.limitTolast(25).orderByKey(true);
      return q;
    );
  }

for more information related to queries goto this link: https://github.com/angular/angularfire2/blob/master/docs/rtdb/querying-lists.md