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Mutation and update cache

Now let's do the integration part. Open src/components/TodoItem.vue and add the following code to define the delete mutation

githubsrc/components/TodoItem.vue
<script setup lang="ts">
import { useMutation } from "@vue/apollo-composable"
import { DELETE_TODOS_BY_PK, UPDATE_TODO_BY_PK } from "../graphql-operations"
const { todos, type } = defineProps(["todos", "type"])
const updateTodo = useMutation(UPDATE_TODO_BY_PK)
+ const deleteTodoByPk = useMutation(DELETE_TODOS_BY_PK, {
+ update: (cache, { data }) => {
+ cache.modify({
+ fields: {
+ todos: (existingTodos, { readField }) => {
+ return existingTodos.filter(
+ (todoRef) => data.delete_todos_by_pk.id !== readField("id", todoRef)
+ )
+ },
+ },
+ })
+ },
+ })
</script>

We have a function defined to handle the button click to remove a todo. Let's update the code to use this deleteTodoByPk mutation:

<template>
<ul>
<li v-for="todo in todos" v-bind:key="todo.id">
<div v-if="todo.is_public" class="userInfoPublic">
<p>@{{ todo.user.name }}</p>
</div>
<div class="view" v-if="type === 'private'">
<div class="round">
<input type="checkbox" :id="todo.id" :checked="todo.is_completed" />
<label
@click="
updateTodo.mutate({
pk_columns: { id: todo.id },
_set: { is_completed: !todo.is_completed },
})
"
:htmlFor="todo.id"
/>
</div>
</div>
<div class="labelContent">
<p :style="todo.is_completed ? 'text-decoration: strikethrough' : ''">
{{ todo.title }}
</p>
</div>
- <button v-if="type === 'private'" class="closeBtn">x</button>
+ <button
+ v-if="type === 'private'"
+ @click="deleteTodoByPk.mutate({ id: todo.id })"
+ class="closeBtn"
+ >
+ x
+ </button>
</li>
</ul>
</template>

Again, we are making a mutation to delete a todo and update the cache. This pattern should be familiar enough by now.

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