How to Display Multiple Student Averages in Laravel Blade Using Eloquent Queries

Learn how to effectively loop through Eloquent queries in Laravel Blade to display a comprehensive list of student averages.
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This video is based on the question https://stackoverflow.com/q/67074908/ asked by the user 'Shuast' ( https://stackoverflow.com/u/15590865/ ) and on the answer https://stackoverflow.com/a/67075014/ provided by the user 'Styphon' ( https://stackoverflow.com/u/1315498/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

If you're working on a Laravel application that involves displaying student information alongside their average marks, you may encounter a common issue. When attempting to retrieve and display data for multiple students using nested queries, it's easy to accidentally overwrite your results. In this post, we'll explore how to handle Eloquent queries properly within loops so that you can display a list of all students and their corresponding average marks in a Blade view.

The Problem

Imagine you have a query that retrieves a list of students, and for each student, you want to calculate their average marks based on several criteria. In your case, you may find that trying to store the average marks in a variable inside a loop results in only the last student’s average being displayed. This happens because the variable gets overwritten with each iteration.

The Original Code

Let's take a closer look at the original approach:

[[See Video to Reveal this Text or Code Snippet]]

In the code above, you can see that $student_average gets updated in every iteration. As a result, only the last computed average will be passed to the Blade view, leading to incomplete information for the users.

The Solution

To fix this issue, you can use an array to store all the students' averages instead of a single variable. Let’s break down the steps on how to achieve this effectively.

Step 1: Initialize an Array

Start by initializing an empty array before you enter the loop:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Collect Each Student's Average

In each iteration, instead of overwriting the average, push the result into the array:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Pass the Array to the View

At the end of the loop, you can pass the array of averages to your Blade view:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s how your complete implementation should look:

[[See Video to Reveal this Text or Code Snippet]]

Displaying in Blade

In your Blade view, you can now loop through the student_averages array and display each student’s average:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By using an array to store each student's average marks, you can effectively display a complete list of students and their scores in your Laravel Blade view. Remember to always check your variable scope when working within loops to avoid unintended data loss. Implementing these practices will ensure a more robust and user-friendly presentation in your applications.

Feel free to reach out if you need further assistance with Eloquent queries or any other Laravel features!

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