我还没能弄清楚这里的问题是什么。我正在使用vue 3。我试图将一个obejct添加到存储状态内部的另一个对象。我可以将其添加到firebase控制台，但唯一尚未解决的问题是如何将其作为对象中的对象添加到state.coaches的存储中。这样我就能够将对象列表显示到屏幕的视图中。

//store-coach.js
import Vue from 'vuex'
import { uid, Notify } from 'quasar'
import firebase from 'boot/firebase'

const state = {
  coaches: {
  }
}

const mutations = {
  addCoach(state, coach) {
    Vue.set(state.coaches, coach.id, coach.coach)
    }
}

const actions = {
  fbReadDataCoaches({ commit }) {
    let coachesfb = firebase.database().ref('coaches')
    //child added
    coachesfb.on('child_added',snapshot => {
      let coachfb = snapshot.val()
      let payload = {
        id: snapshot.key,
        coach: coachfb
      }
      commit('addCoach', payload)
    })
  },
  fbaddCoach({}, payload){
    let coachRef = firebase.database().ref('coaches/' + payload.id)
    coachRef.set(payload.coach, error =>{
      if(!error){
        Notify.create('Coach added!!')
      }
    })
  }
}

//index.js
import Vuex from 'vuex'
import coaches from './store-coach'
export default function (/* { ssrContext } */) {
  const Store = new Vuex.Store({
    modules: {
      coaches
    }
  })
  return Store
}

当Vue.set(state.coaches, coach.id, coach.coach)被触发时，我得到的错误是

Uncaught TypeError: vuex__WEBPACK_IMPORTED_MODULE_3__.default.set is not a function

先谢了！2感谢您抽出时间！