Add multiple components to child component via slot - vue.js

Question

I have a pretty simple implementation so I feel like this may be a silly question. Just starting with vue I am trying to make a component be able to list other components; kind of like a reusable List, Table, Grid, ect.
Parent component imports gridView as a normal component:
<template>
<div :id="id" class="grid-view">
<slot></slot>
</div>
</template>
And then in another component I attempt to build this:
<grid-view :dataSource="items">
<grid-view-item-test
v-for="(item, index) in items"
:key="index"
:title="item.title"
/>
</grid-view>
And then grid-view-item-test is simple. title being a prop. Works completely fine standing alone or without the use of a slot, but I wanted to make grid-view reusable to just take whatever other component I add and display as-is.
<template>
<div>
<div>{{ title }}</div>
</div>
</template>
If I were to do something like this:
<grid-view :dataSource="items">
<grid-view-item-test
:key="index"
:title="'Test 1'"
/>
<grid-view-item-test
:title="'Test 2'"
/>
<grid-view-item-test
:title="'Test 3'"
/>
</grid-view>
It works completely fine. Am I doing the loop wrong? I can confirm the loop works to get the number of items correctly. If I make a default fallback on the slot - I get the correct number, and I have printed it directly outside of the grid-view component.
Is this not a possibility? If not, would you just use HTML instead of a component for a reusable table as that seems to work fine.
Edit:
It works completely fine if I use an of strings, or numbers, but not objects.
I've tracked it down to items being an empty array as a computed variable and then throwing TypeError: null is not an object (evaluating 'oldChildren[i]'). Can confirm that items begins empty, and then is populated once a database call sets it, but I'm guess I'm not able to do something like that with slots?
After more testing it fails when you update the dataSet (items) at all. Is re-rending not possible with slots like this?
It works flawlessly if I have an empty div (or anything) when there are no items in the initial array.

Answer 1

You probably should provide more a more accurate code because I don't see any problem with what you provided
Working example:
const gridView = Vue.component('gridView', {
props: ['dataSource'],
template: `
<div class="grid-view">
<h4>My grid</h4>
<slot></slot>
</div>
`
})
const gridItem = Vue.component('grid-view-item-test', {
props: ['title'],
template: `
<div>
<div>{{ title }}</div>
</div>
`
})
const vm = new Vue({
el: '#app',
data: () => ({
items: [{
title: 'Test 1'
},
{
title: 'Test 2'
},
{
title: 'Test 3'
},
]
})
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
<grid-view :data-source="items">
<grid-view-item-test v-for="(item, index) in items" :key="index" :title="item.title" />
</grid-view>
</div>