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docs(v-model): document factory-function defaults for objects/arrays #3434

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docs(v-model): document factory-function defaults for objects/arrays
pcoterecollective Jul 21, 2026
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Update v-model.md
pcoterecollective Aug 8, 2026
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10 changes: 10 additions & 0 deletions src/guide/components/v-model.md
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Expand Up @@ -96,6 +96,16 @@ const model = defineModel({ required: true })
const model = defineModel({ default: 0 })
```

When the default value is an object or array, return it from a factory function, just as with [prop defaults](/guide/components/props#prop-validation). Otherwise every component instance that falls back to the default shares the **same** reference, and mutating the model in one instance leaks into the others:
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```js
// ❌ every instance shares one object
const model = defineModel({ default: {} })

// ✅ each instance gets a fresh object
const model = defineModel({ default: () => ({}) })
```

:::warning
If you have a `default` value for `defineModel` prop and you don't provide any value for this prop from the parent component, it can cause a de-synchronization between parent and child components. In the example below, the parent's `myRef` is undefined, but the child's `model` is 1:

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