Vue alert: A duplicate key with the value of '10' has been identified. This could potentially lead to an issue with updates

I've been encountering a persistent error that I can't seem to resolve: [Vue warn]: Duplicate keys detected: '10'. This issue is causing an update error in my application.

Despite trying the following steps, the error continues to appear in my console:

1. Fetching data from a JSON API to retrieve both user and album lists. 2. Attempting to merge these arrays into a single array. 3. Nesting a v-for loop to render a list of users with each user's corresponding album based on their ID.


Details of My App:

<template>
    <div>
        <!-- Loop through the usersInfos array -->
        <div>
            <ul v-for="u in usersInfos" :key="u.id">
                <li class="puce">{{u.name}}</li>
                <li>{{u.username}}</li>
                <li>{{u.email}}</li>
                <li>{{u.phone}}</li>
                <li>{{u.website}}</li>
            </ul>
        </div>
        <div>
            <!-- Loop through the albums array / a -->
            <ul ul v-for="album in albums" :key="album.userId">
                <li>{{album.title}}</li>
            </ul>
        </div>
    </div>
</template>

<script>
    import axios from 'axios'

    export default {
        name: 'Page',
        data() {
            return {
                usersInfos: [],
                usersList: [],
                albums: [],
                search: '',
            }
        },
        mounted() {
            // Request users List
            let merge = [];
            let usersList = [];
            let albums = [];

            axios.get('https://jsonplaceholder.typicode.com/users')
                .then(response => {
                    this.usersList = response.data;
                    usersList = this.usersList;
                    console.log(usersList, 'usersList');
                    merge.push(usersList);
                    console.log(merge, 'FIRST_MERGE');
                })
                .catch((error) => {
                    console.log(error);
                });

            axios.get('https://jsonplaceholder.typicode.com/users/1/albums')
                .then(responseAlbum => {
                    this.albums = responseAlbum.data;
                    albums = this.albums;
                    console.log(albums, 'Albums');
                    merge.push(albums);
                    console.log(merge, 'SECOND_MERGE');
                })
                .catch((error) => {
                    console.log(error);
                });
            merge = this.usersInfos;
        }
    }
</script>

Answer №1

It appears that the issue lies within duplicates in the code. By eliminating these duplicates, you may find a solution to the problem.

To remove any duplicated elements, you can use the following code snippet :

this.dataList = this.dataList.filter((val, indx, arr) => arr.findIndex(elem => elem.id === val.id) === indx)

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