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<script lang="ts">
import { computed, defineComponent } from 'vue'
import { useQuery } from '@tanstack/vue-query'
import { Author, Post } from './types'
const fetchPost = async (id: number): Promise<Post> =>
await fetch(`https://jsonplaceholder.typicode.com/posts/${id}`).then(
(response) => response.json(),
)
const fetchAuthor = async (id: number): Promise<Author> =>
await fetch(`https://jsonplaceholder.typicode.com/users/${id}`).then(
(response) => response.json(),
)
export default defineComponent({
name: 'PostDetails',
props: {
postId: {
type: Number,
required: true,
},
},
emits: ['setPostId'],
setup(props) {
const {
isPending,
isError,
isFetching,
data: post,
error,
} = useQuery({
queryKey: ['post', props.postId],
queryFn: () => fetchPost(props.postId),
})
const authorId = computed(() => post.value?.userId)
const { data: author } = useQuery({
queryKey: ['author', authorId],
queryFn: ({ queryKey: [, id] }) => fetchAuthor(id),
enabled: computed(() => !!authorId.value),
})
return { isPending, isError, isFetching, post, error, author }
},
})
</script>
<template>
<h1>Post {{ postId }}</h1>
<a @click="$emit('setPostId', -1)" href="#"> Back </a>
<div v-if="isPending" class="update">Loading...</div>
<div v-else-if="isError">An error has occurred: {{ error }}</div>
<div v-else-if="post">
<h1>
{{ post.title }} <span v-if="author">by {{ author.name }}</span>
</h1>
<div>
<p>{{ post.body }}</p>
</div>
<div v-if="isFetching" class="update">Background Updating...</div>
</div>
</template>
<style scoped>
.update {
font-weight: bold;
color: green;
}
</style>
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