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fix(v-model): transformModel should check if prop is defined and fall back to attrs if needed (fix #8430) #8442

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4 changes: 3 additions & 1 deletion src/core/vdom/create-component.js
Original file line number Diff line number Diff line change
Expand Up @@ -250,7 +250,9 @@ function mergeHook (f1: any, f2: any): Function {
function transformModel (options, data: any) {
const prop = (options.model && options.model.prop) || 'value'
const event = (options.model && options.model.event) || 'input'
;(data.props || (data.props = {}))[prop] = data.model.value
// check if prop is defined, if not, attrs will be used
const propOrAttrKey = options.props && options.props[prop] ? 'props' : 'attrs'
;(data[propOrAttrKey] || (data[propOrAttrKey] = {}))[prop] = data.model.value
const on = data.on || (data.on = {})
const existing = on[event]
const callback = data.model.callback
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21 changes: 21 additions & 0 deletions test/unit/features/directives/model-component.spec.js
Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,27 @@ describe('Directive v-model component', () => {
expect(vm.text).toBe('foo o')
})


it('adds value to $attrs if no prop is defined', () => {
const Test = {
render: () => {}
}

const vm = new Vue({
components: {
Test
},
data () {
return {
value: 'value'
}
},
template: '<test v-model="value" ref="test" />'
}).$mount()

expect(vm.$refs.test.$attrs.value).toEqual(vm.value)
})

// #8436
it('should not double transform mode props', () => {
const BaseInput = {
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