v-model inside v-for doesn't set value when property name is dynamic

[inca]

As explained in this forum post and demonstrated by this fiddle, if you have something like v-model="obj['prefix-' + key]", you occasionally get this:

Cannot read property "get" of undefined

or that:

[Vue warn]: Invalid setter function body:  'prefix-'+scope.key

[yyx990803]

Yes, this is a known issue. But in general, the advice is never rely on v-model to create a non-existent property for you. Follow the best practice and properly initialize your data.