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Vue.merge, reactive deep merge of objects #9853

wendt88 opened this Issue Apr 10, 2019 · 1 comment


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wendt88 commented Apr 10, 2019

What problem does this feature solve?

I want to merge two or more objects like _.merge, $.extend or Object.assign, but I can't get the changes outside the component, becoause this methods does not call the Vue.set.
I created a custom method like below, but it would be nice to have this feature out of the box

What does the proposed API look like?

Vue.prototype.$merge = (baseValue, value) => {
    // merge arrays
    if (
        && Array.isArray(value)
    ) {
        for (let i = 0; i < value.length; i  ) {
            let val = Vue.prototype.$merge(baseValue[i], value[i]);
            if (val === undefined)
            if (baseValue[i])
                Vue.set(baseValue, i, val);
    // merge objects
    else if (
        && baseValue
        && typeof value === 'object'
        && typeof object === 'object'
    ) {
        for (let key of Object.keys(value)) {
            let val = Vue.prototype.$merge(baseValue[key], value[key]);
            if (val === undefined)
            Vue.set(baseValue, key, val);
    // return value
    else if (value !== undefined)
        return value;
        return baseValue;

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yyx990803 commented Apr 10, 2019

This can be done in userland as a custom helper - I think the use case is quite niche to be included in core. As stated in the past, we intend to avoid adding pure utility functions unless it cannot be easily implemented by the user.

@yyx990803 yyx990803 closed this Apr 10, 2019

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