Vue JS returns [__ob__: Observer] data instead of my array of objects

🐦 Solving the Vue JS [ob: Observer] Issue

So, you're new to Vue JS and JavaScript, and you are facing an issue where instead of getting an array of objects from your API call, you are getting [__ob__: Observer] data. Fret not! In this guide, we will address this common issue, provide easy solutions, and get you flying in no time! ✨

The Scenario

Let's start by understanding the context. You have a page where you want to fetch data from the database using an API call. You've tested the API call with Postman, and it returns the correct JSON data. However, when you try to use Vue JS to display the data, you encounter the dreaded [__ob__: Observer] instead of your array of objects. Let's fix that!

Understanding the Issue

To understand the issue, let's take a look at the code you shared. In your Vue template file, you have a data section where you define your pigeons array. Inside the created lifecycle hook, you call the fetchPigeons method to fetch the data from the API endpoint. However, when you log this.pigeons to the console, you see the Observer data instead of your expected array.

The Root Cause

The issue you are facing is due to Vue's reactivity system. Vue wraps your data objects with an Observer to track changes and facilitate reactivity. This is what causes the [__ob__: Observer] to appear in your output.

The Solution

To access your actual array of objects, you need to use the this.pigeons array within your Vue component methods or computed properties. It will automatically unwrap the Observer and give you the desired array. The [__ob__: Observer] is only shown when you directly log the entire data object to the console.

For example, in your fetchPigeons method, you correctly assign res.data to this.pigeons, so accessing it within that method will give you the expected array. However, when you log it outside the method or in the created hook, you will see the Observer object.

Updated Code

To summarize, here's an updated version of your Vue template file:

<template>
    <div>
        <h2>Pigeons in the racing loft</h2>
        <div class="card-content m-b-20" v-for="pigeon in pigeons" :key="pigeon.id">
            <h3>{{ pigeon.id }}</h3>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            pigeons: [],
            pigeon: {
                // your pigeon properties
            },
            pigeon_id: ''
        }
    },
    created() {
        this.fetchPigeons();
    },
    methods: {
        fetchPigeons() {
            fetch('api/racingloft')
                .then(res => res.json())
                .then(res => {
                    this.pigeons = res.data; // Unwrapped array
                    console.log(this.pigeons); // Expected array
                })
        }
    }
}
</script>

With this updated code, you should now be able to retrieve and display your array of objects correctly.

Expanding the Horizon

Congratulations on fixing the Vue JS [__ob__: Observer] issue! Now that you have a better understanding of Vue's reactivity system, you can continue exploring and building amazing applications with confidence. If you encounter any issues or have further questions, don't hesitate to reach out and seek support.

Remember, the key to success is to keep learning, experimenting, and sharing your knowledge with the community. Let's soar to new heights together! 🚀

Now, it's your turn! Have you ever encountered Vue JS reactivity issues? How did you solve them? Share your experiences and insights in the comments below and let's make Vue JS development a breeze for everyone. Happy coding! 💻✨