Error: The post method in $setup is not defined in Vue Composition API

Dealing with a frustrating issue in my Vue application. One page is functioning perfectly fine, while the other is causing trouble by displaying this error:

The first page loads a collection of wordpress posts (Blog.vue) without any issues, but the second one, which displays an individual post, throws an error stating:

TypeError: $setup.post is undefined

Blog.vue

<template>
<v-col v-for="post in wpposts" cols="12" sm="4">
</template>
<script lang="ts" setup>
  import ...

  onMounted(() => {
    getPosts();
  })

  onUpdated(() => {
    var msnry = new Masonry('.masonry', {
        // options
        itemSelector: "[class*='col-']",
    });
  })

  const rootUrl = 'https://myurl.com/';

  const wpposts = ref()

  async function getPosts() {
    const data = await fetchData(new Request(rootUrl + 'index.php/wp-json/wp/v2/posts?_embed')) as Post[];
    data.forEach(element => {
    ...
    wpposts.value = data;
}

const fetchData = async <T>(request: Request): Promise<T> => {
    const response = await fetch(request);
    return await response.json();   
}

BlogPost.vue Encountering the following error

TypeError: $setup.post is undefined
<template>

  <v-container fluid>
    <!-- <Suspense> -->
    
    <v-row>

        <v-col cols="12" sm="4"gt;

          <v-img height="250" :src="post.imageUrl" cover></v-img> <!-- Blowsup -->

  </v-container>
  </template>
<script lang="ts" setup>
  import { ref, onMounted, onUpdated, type Ref, reactive } from 'vue'
  import { DateTime } from "luxon";
  import { Post } from "../blogtypes";

  const props = defineProps({
    id: String,
    url: String
  })

  onMounted(() => {
    getPost();
  })

  const post = ref()

  const rootUrl = 'https://myurl.com/';

   async function getPost() {
    const data = await fetchData(new Request(rootUrl + 'index.php/wp-json/wp/v2/posts/' + props.id + '?_embed')) as Post;
    ...
    post.value = data;
}

  const fetchData = async <T>(request: Request): Promise<T> => {
    const response = await fetch(request);
    return await response.json();   
}
</script>

Struggling to figure out a solution for this error as one component works flawlessly with this code structure while the other encounters

TypeError: $setup.post is undefined

Answer №1

Upon initial rendering, it appears that the post reference is not defined, leading to this error. Consider using v-if or optional chaining to avoid this problem:

   <v-img v-if="post" height="250" :src="post.imageUrl" cover></v-img>

Alternatively, you can try:

   <v-img height="250" :src="post?.imageUrl" cover></v-img>

Answer №2

After some troubleshooting, I managed to solve this issue by defining the reference as follows:

const post = ref<Post | null>(null);

This allows me to access it in the following manner:

<v-img height="250" :src="post?.imageUrl" cover></v-img>

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