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fix: In development mode, warns if user tries to Vue.set a property t… #8138

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fix: In development mode, warns if user tries to Vue.set a property t… #8138

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6fecabe
fix: In development mode, warns if user tries to Vue.set a property t…
bigtunacan May 6, 2018
3aea4dd
test: Adding an observer spec for new feature to catch properties bei…
bigtunacan May 8, 2018
e568602
fix: Adds a template to observer spec Vue instance to fix failing spec.
bigtunacan May 9, 2018
54e64df
Update observer.spec.js
posva May 10, 2018
178724d
refactor: use else if instead of if
posva May 21, 2018
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12 changes: 8 additions & 4 deletions src/core/observer/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -196,10 +196,14 @@ export function defineReactive (
* already exist.
*/
export function set (target: Array<any> | Object, key: any, val: any): any {
if (process.env.NODE_ENV !== 'production' &&
(isUndef(target) || isPrimitive(target))
) {
warn(`Cannot set reactive property on undefined, null, or primitive value: ${(target: any)}`)
if (process.env.NODE_ENV !== 'production') {
if (isUndef(target) || isPrimitive(target)) {
warn(`Cannot set reactive property on undefined, null, or primitive value: ${(target: any)}`)
} else if (Object.getOwnPropertyDescriptor(target, key) &&
(typeof (Object.getOwnPropertyDescriptor(target, key).get) === 'undefined') &&
!Array.isArray(target)) {
warn(`Cannot enable reactivity on a property that is already defined: ${(key: any)}`)
}
}
if (Array.isArray(target) && isValidArrayIndex(key)) {
target.length = Math.max(target.length, key)
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16 changes: 16 additions & 0 deletions test/unit/modules/observer/observer.spec.js
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Expand Up @@ -316,6 +316,22 @@ describe('Observer', () => {
}).then(done)
})

it('Cannot enable reactivity on a property that is already defined', done => {
const vm = new Vue({
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A Vue instance must have a template prop or render fn, your test is throwing an error before getting to the checks

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@dhensche Thanks; that was it.

template: '<div></div>',
data: {
person: {
age: 32
}
}
}).$mount()
vm.person.job = 'Programmer'
Vue.set(vm.person, 'job', 'Educator')
waitForUpdate(() => {
expect(`Cannot enable reactivity on a property that is already defined`).toHaveBeenWarned()
}).then(done)
})

it('warning set/delete on Vue instance root $data', done => {
const data = { a: 1 }
const vm = new Vue({
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