Скачать или смотреть Resolving Laravel update() Not Working in a Foreach Loop

Discover how to troubleshoot and fix issues with `Laravel update()` not working in a foreach loop despite having the fillable property defined.
---
This video is based on the question https://stackoverflow.com/q/72214112/ asked by the user 'user3274489' ( https://stackoverflow.com/u/3274489/ ) and on the answer https://stackoverflow.com/a/72215606/ provided by the user 'user3274489' ( https://stackoverflow.com/u/3274489/ ) 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 update() not working in a foreach even though I have declared $fillable

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.
---
Troubleshooting Laravel update() in a Foreach Loop

Introduction

If you're working with Laravel and encounter the frustrating situation where the update() method doesn't seem to work properly in a foreach loop, you're not alone! This problem can be particularly perplexing, especially when you've correctly defined the fillable properties in your model. In this guide, we'll dive into a common scenario that could be causing your update() method to fail and provide a straightforward solution.

The Problem

Imagine you have the following code snippet where you're trying to update records using Laravel's Eloquent ORM:

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

In this code, you're effectively attempting to update multiple records based on IDs passed from the request. However, you notice that while other fields, like user_id, are updated correctly, the text field remains unchanged despite being set to a new value before calling update().

Key Questions

Why is the text column not updating?

Are the fillable properties correctly set in the model?

Is there something simple being overlooked?

The Solution

After executing a deeper inspection of the code, it turns out that the reason the text field isn't updating is due to how the loop processes the same ID multiple times. Here’s a step-by-step breakdown to understand the fix:

Check for Duplicate IDs

When you're iterating with the following code:

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

It's crucial to ensure that each iteration is hitting unique records. If the id assigned to $p is the same in multiple iterations, you are unintentionally overwriting the same record multiple times. The final text value will be the one from the last iteration, which may be null or not as expected.

Recommended Fix

To avoid this issue, ensure that your loop processes unique IDs correctly. Here is a modified version of the code:

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

Why Use save() Instead of update()?

Using save() is often recommended as it saves the entire model state, including any fillable fields that may have been modified without needing to pass an array indicating which fields to update. It provides a slight performance benefit and can simplify your code by reducing potential oversight in setting fillable attributes.

Conclusion

Troubleshooting issues with the update() method in a foreach loop can often lead you down a rabbit hole. However, by checking for duplicate IDs and ensuring you're processing unique records, you can efficiently resolve these issues. Always remember to use techniques that improve code clarity and ensure you handle each model instance appropriately.

With this understanding, you can confidently tackle the update() method in Laravel without fear of it being a stumbling block in your development process!