How do I access rootGetters from a different namespaced module in Vuex?

I have a Vuex module named 'forms'. I have a different (also namespaced) module named 'users'.

I'm using Vuexfire (for the first time, which I think is what's tripping me up). And have an action that works like this:

      const actions = {
      loadPendingHoursRequests: firestoreAction((context) => {
        context.bindFirestoreRef('pendingHoursRequests', db.collection('hours')
        .where('submittedToUID', '==', "iTd865JKWXRmhz2D2mtW7KIpL7a2"))
      }),

This works as expected and creates a real-time connection between Firestore and Vuex. The problem is I want "iTd865JKWXRmhz2D2mtW7KIpL7a2" to be a dynamic value drawn from the 'users' module.

I'm just completely lost. If I refactor like this:

  loadPendingHoursRequests ({ dispatch, commit, getters, rootGetters }) {
    let uid = rootGetters['users/currentUserUID'];
    console.log(uid)
    firestoreAction((context) => {
      context.bindFirestoreRef('pendingHoursRequests', db.collection('hours').where('submittedToUID', '==', uid))
    })
  }

The console.log above returns 'undefined'. And even if I remove the .where('submittedToUID', '==', uid), the firestoreAction doesn't work anyway.

Thanks in advance. I'd love to know what I'm not understanding here.

Untested (I don't use VuexFire) but assuming the bindFirestoreRef needs the context object, you can access rootGetters as a property of it as well. Putting the two snippets together ilke this:

const actions = {
  loadPendingHoursRequests: firestoreAction((context) => {
    const uid = context.rootGetters['users/currentUserUID'];
    context.bindFirestoreRef('pendingHoursRequests', db.collection('hours')
      .where('submittedToUID', '==', uid))
  })
}