Vue messaging application fails to display data upon mounting

Recently, I've been experimenting with different Vue chat libraries and encountered this interesting piece of code:

<template>
    <p>{{ this.users[0] }}</p>
</template>


<script>
export default {

  data() {
    return {
      users: []
    }
  },
  mounted() {
    firestoreService.getAllUsers().then(({ data }) => {
      data.forEach((user, i) => {
        this.users[i] = user
      });
    })
  }
</script>

Essentially, I have a Firestore index where my user data is stored and upon mounting the component, I populate the users array. However, it seems like Vue is not recognizing the data. Any suggestions on what might be causing this issue?

If I use console.log to output the data, I can see that the data is indeed present in the console.

Answer №1

Vue 2 does not support reactive assignment of array elements by index, as mentioned in the documentation. To make arrays reactive, you can use Vue.set or array methods like push. For example:

data.forEach((item, idx) => {
    Vue.set(this.items, idx, item);
});

To fully replace an array with new data, it is recommended to do so in this way, as also suggested in the comments:

apiService.fetchData().then(({ response }) => {
    this.dataArray = response;
})

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