Скачать или смотреть How to Fix Undefined Variable Errors in Laravel 7: A Guide to Passing Data to Blade Views

Learn how to pass one row from a database to a blade view in Laravel 7 correctly, avoiding common errors like "undefined variable."
---
This video is based on the question https://stackoverflow.com/q/65035798/ asked by the user 'Skumar' ( https://stackoverflow.com/u/14418291/ ) and on the answer https://stackoverflow.com/a/65035905/ provided by the user 'Marwane Ezzaze' ( https://stackoverflow.com/u/10794716/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Laravel 7 - Select only one row from a database and pass it to blade

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix Undefined Variable Errors in Laravel 7: A Guide to Passing Data to Blade Views

When working with Laravel, one common issue developers encounter is the Undefined variable error. This can occur when trying to pass data from the controller to a view using Blade templating. In this guide, we will explore how to successfully fetch a single row from a database and pass it to a Blade view, solving the much-feared Undefined variable : tuser error.

The Problem: Undefined Variable in Blade

You might find yourself facing the following error when attempting to display data in your Blade view:

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

This typically happens when the variable you expect to use in your view is not available because of an error in its declaration or transfer from the controller.

The Setup: What's Going Wrong?

Assuming you have set up your controller and view, here’s a snippet of what you might be trying to do:

Blade View Sample (multipage1.blade.php)

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

Controller Sample

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

In this scenario, the controller correctly attempts to fetch the user from the database. However, the way the data is being passed to the view may not be properly handled due to common pitfalls that we will clarify.

The Solution: Correct Way to Pass Data

1. Fetching Data in the Controller

To pass the variable to the Blade view, ensure you are using the compact method correctly. Here’s the best approach:

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

Notice: When using the compact function, the variable name should be passed as a string without the $ symbol. This makes it clear to Laravel that you're referring to the variable in the current context.

2. Adjusting Blade View for Safe Display

In your Blade template, ensure you access the user variable correctly. Here’s how you should write the input field:

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

Key Changes in Blade:

Avoid the @ if directive for rendering temp_email: You can use the null coalescing operator ?? to provide a fallback if $tuser is not defined. This way, if $tuser is null, the input field will simply render as empty without throwing errors.

3. Final Code Recap

Here's a full example combining both the controller and Blade view for clarity:

Controller:

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

Blade View (multipage1.blade.php):

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

Conclusion

By following these simple steps, you will mitigate the undefined variable error when passing data from your controller to your Blade views in Laravel 7. Always ensure that when using the compact method, your variable names are correctly handled, and use safety checks in your Blade files, like the null coalescing operator, for a smoother user experience.

Happy coding!