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The problem is that the input event fires before the v-model binding has changed the data.
Simple solution is to use the change event instead. For example
<input v-model="article.is_review" @change="update">
Simplified demo ~ http://jsfiddle.net/u20h5tzv/
Hint: Try changing it back to @input and see the difference in timing.
👤Phil
Source:stackexchange.com