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Vue.js: How to Prevent Unintended Updates in v-for Loop with Reactive State Management

👀 Views: 323 💬 Answers: 1 📅 Created: 2025-06-25
vue vue3 reactivity v-for JavaScript

I'm refactoring my project and I'm sure I'm missing something obvious here, but I'm working with Vue 3 and trying to manage a list of user comments using the Composition API... I have a reactive state that contains an array of comments, and I'm rendering each comment using a `v-for` loop. However, I'm running into an scenario where updates to one comment are unintentionally affecting others in the list. Here's a simplified version of my component: ```javascript <template> <div> <ul> <li v-for="(comment, index) in comments" :key="comment.id"> <input v-model="comment.text" /> <button @click="updateComment(index)">Update</button> </li> </ul> </div> </template> <script> import { ref } from 'vue'; export default { setup() { const comments = ref([ { id: 1, text: 'First comment' }, { id: 2, text: 'Second comment' }, { id: 3, text: 'Third comment' } ]); const updateComment = (index) => { // Simulating an API update console.log('Updating comment:', comments.value[index]); // Here, I would normally call an API to update the comment }; return { comments, updateComment }; } }; ``` The question arises when I try to update the text of one comment. After making changes to one `input`, the updates seem to affect the other comments. For example, if I change the text of the second comment and then focus on the third, it gets reset or altered to the same value as the second comment. I’ve tried using `v-model.lazy` to see if that would help to delay the updates, but it doesn't seem to change the behavior. Additionally, I checked my console and didn't find any warnings or behavior messages that could indicate a question. Has anyone faced a similar scenario or can suggest a solution to prevent these unintended updates? Could it be related to how Vue handles reactivity in arrays? This is part of a larger service I'm building. What am I doing wrong? How would you solve this? I'm working in a Ubuntu 22.04 environment. Is there a simpler solution I'm overlooking?