What is preventing me from directly assigning properties to my data object?

Struggling to access my question props in order to assign its property directly into my data properties. Although I can use the property directly from my template, I am unable to assign it into the data.

Currently, I can only retrieve the value of props from my template:

props: ['question'],
data () {
    return {

    }
};

computed: {
    upVote () {
        return this.question.upvoted
    },

    count () {
        return this.question.vote_count
    }
}

methods: {
    upVoteIt () {
        if(User.loggedIn()) {
            this.upVote = !this.upVote
            this.upVote ? this.incr() : this.decr()
        }
    },

    incr () {
        this.count ++
    },

    decr () {
        this.count --
    }
}

<v-icon size="50" :color="upcolor" @click="upVoteIt">fas fa-sort-up</v-icon>
<span> {{ count }} </span>

I have realized that I can receive the value by utilizing the props directly inside my template instead of attempting to reassign it to a data property.

Answer №1

Utilize the .sync modifier, a unique feature that allows you to synchronize props with your parent component. Check out the documentation for more information. This eliminates the need to use data.

To implement this, emit an event in your child component to update the question with the new value:

props: ['question'],
methods: {
    upVoteIt () {
        if(User.loggedIn()) {
            this.$emit('update:question', {
               ...this.question,
               upvoted: !this.question.upvoted,
               count: this.question.upvoted ? this.question.count - 1 : this.question.count + 1 
            }
        }
    }
}

<v-icon size="50" :color="upcolor" 
    @click="upVoteIt">fas fa-sort-up</v-icon>
    <span> {{ question.vote_count }} </span>

In your parent component, include the following:

<YourQuestionComponent 
   :question.sync="myQuestionVariable"
/>

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