V-data-table selection checkboxes initially on, using custom row template - vue.js

Question

I'm using a custom template for each row in a v-data-table and I am trying to have checkboxes working for each row. For some reason if i use :value="item" all checkboxes are initially checked. I am not sure how it should be done. I want them not-to-be checked initially... When selecting, complete item should be added to selected. Also, on v-data-table I have show-select and this (de)select all checkbox must work. This is the case but initially I now have to use it before the checkboxes for the rows actually work.
<template #item="{ item }">
<tr>
<td>
<v-checkbox v-model="selected" :value="item"></v-checkbox>
</td>
<td v-for="field in fields" v-bind:key="field.id">{{ item[field.value] }}
</td>

Answer 1

You can simply achieve that without creating a separate template for the checkboxes.
Live Demo :
new Vue({
el: '#app',
vuetify: new Vuetify(),
data () {
return {
singleSelect: false,
selected: [],
headers: [
{
text: 'Dessert (100g serving)',
align: 'start',
sortable: false,
value: 'name',
},
{ text: 'Calories', value: 'calories' },
{ text: 'Fat (g)', value: 'fat' },
{ text: 'Carbs (g)', value: 'carbs' },
{ text: 'Protein (g)', value: 'protein' },
{ text: 'Iron (%)', value: 'iron' },
],
desserts: [
{
name: 'Frozen Yogurt',
calories: 159,
fat: 6.0,
carbs: 24,
protein: 4.0,
iron: '1%',
},
{
name: 'Ice cream sandwich',
calories: 237,
fat: 9.0,
carbs: 37,
protein: 4.3,
iron: '1%',
},
{
name: 'Eclair',
calories: 262,
fat: 16.0,
carbs: 23,
protein: 6.0,
iron: '7%',
},
],
}
},
})
<script src="https://cdn.jsdelivr.net/npm/vue#2.x/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vuetify#2.2.30/dist/vuetify.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vuetify#2.2.30/dist/vuetify.min.css"/>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900"/>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/#mdi/font#4.x/css/materialdesignicons.min.css"/>
<div id="app">
<v-app id="inspire">
<h5>Selected: {{selected}}</h5>
<v-data-table
v-model="selected"
:headers="headers"
:items="desserts"
item-key="name"
show-select
class="elevation-1"
>
</v-data-table>
</v-app>
</div>
Updated : Below is the demo based on the custom template as per the author demand.
new Vue({
el: '#app',
vuetify: new Vuetify(),
data () {
return {
singleSelect: false,
selected: [],
headers: [
{
text: 'Dessert (100g serving)',
align: 'start',
sortable: false,
value: 'name',
},
{ text: 'Calories', value: 'calories' },
{ text: 'Fat (g)', value: 'fat' },
{ text: 'Carbs (g)', value: 'carbs' },
{ text: 'Protein (g)', value: 'protein' },
{ text: 'Iron (%)', value: 'iron' },
],
desserts: [
{
name: 'Frozen Yogurt',
calories: 159,
fat: 6.0,
carbs: 24,
protein: 4.0,
iron: '1%',
},
{
name: 'Ice cream sandwich',
calories: 237,
fat: 9.0,
carbs: 37,
protein: 4.3,
iron: '1%',
},
{
name: 'Eclair',
calories: 262,
fat: 16.0,
carbs: 23,
protein: 6.0,
iron: '7%',
},
],
}
},
})
<script src="https://cdn.jsdelivr.net/npm/vue#2.x/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vuetify#2.2.30/dist/vuetify.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/vuetify#2.2.30/dist/vuetify.min.css"/>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900"/>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/#mdi/font#4.x/css/materialdesignicons.min.css"/>
<div id="app">
<v-app id="inspire">
<h5>Selected: {{selected}}</h5>
<v-data-table
v-model="selected"
:headers="headers"
:items="desserts"
item-key="name"
show-select
class="elevation-1"
>
<template v-slot:items="item">
<tr>
<td>
<v-checkbox v-model="selected" :value="item"></v-checkbox>
</td>
<td v-for="field in Object.keys(item)" v-bind:key="item[field]">{{ item[field] }}
</td>
</tr>
</template>
</v-data-table>
</v-app>
</div>