vue3 + pinia：如何从？store 中获取一个值？

Question

I am using vue 3 with composition api and pinia

I have an auth store that is reading from the store a default email and a default password

import { useAuthStore } from "stores/auth";
const authStore = useAuthStore();

const email = authStore.loginUser;
const password = authStore.passwordUser;

Then I am using email and password as v-model .

The problem is that both are not reactive. If I change the value from the text input, the model is not updated

I ask kindly for an explanation of the problem and a solution.

Answer 1

const email = authStore.loginUser

creates an email constant with the current value of authStore.loginUser , losing reactivity. To keep reactivity, you could use computed :

import { computed } from 'vue'
// ...

const email = computed({
  get() { return authStore.loginUser },
  set(val) { authStore.loginUser = val }
})

...or you could use the provided storeToRefs wrapper, designed for extracting/deconstructing store reactive props while keeping their reactivity (basically to avoid the above boilerplate):

import { storeToRefs } from 'pinia'
// ...

const { 
  loginUser: email,
  passwordUser: password
} = storeToRefs(authStore) 
// email & password are now reactive 

---

Important : you only want to deconstruct state and getters using storeToRefs . Actions should be used directly from the store object ( authStore in your case) or deconstructed without the wrapper:

const { actionOne, actionTwo } = authStore

This is specified in docs linked above:

... so methods and non reactive properties are completely ignored.

---

In conclusion, you typically end up with two deconstructions from each store:

import { useSomeStore } from '@/store'
// reactive:
const { s1, s2, g1, g2 } = storeToRefs(useSomeStore())
// non-reactive:
const { a1, a2 } = useSomeStore()

where s1 , s2 are state members, g1 , g2 are getters and a1 , a2 are actions .

Answer 2

I fixed as simply as

import { useAuthStore } from "stores/auth";

const authStore = useAuthStore();

const email = ref(authStore.loginUser);
const password = ref(authStore.passwordUser);
const rememberme = ref(false);

no useless storeToRefs used