Avoid mutating a prop directly

Question

I am getting warning:

app.js:87486 [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "likescount"

My Blade

        <path-like-toggle likescount="{{$path->likeCount}}" isliked="{{$path->canBeunLiked()}}" path="{{$path->slug}}" type="{{$path->type}}" ></path-like-toggle>

Vue Code

      props:['isliked','path','type','likescount']
    ,
methods:{
         like () {
             axios.post(`/${this.type}/${this.path}/like/`)
                this.likingStatus = true;
                this.likescount ++;
        },
         unlike () {
             axios.post(`/${this.type}/${this.path}/unlike/`)
                this.likingStatus = false;
                this.likescount --;

        },
    }

Jack Robertson Jack Robertson · Accepted Answer · 2019-06-25T11:29:09

Initialise a data attribute from your prop, and manipulate that.

export default {
    data() {
        return {
            numberOfLikes: this.likescount
        }
    },

    props: [
        'isliked',
        'path',
        'type',
        'likescount'
    ],

    methods:{
        like() {
            axios.post(`/${this.type}/${this.path}/like/`);

            // ...

            this.numberOfLikes++;
        },

        unlike() {
            axios.post(`/${this.type}/${this.path}/unlike/`);

            // ...

            this.numberOfLikes--;
        },
    }
}

Avoid mutating a prop directly

2 Answers