Скачать или смотреть How to Get Next and Previous Records in Laravel by a Specific Column

Discover how to effectively retrieve `next` and `previous` records in Laravel ordered by a specific column instead of the default ID. This guide provides a detailed solution and practical examples.
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How to Get Next and Previous Records in Laravel by a Specific Column: A Step-by-Step Guide

In Laravel, the ability to navigate through records is a common requirement, especially when dealing with models like Product. Occasionally, you might want to retrieve the next or previous record based on a specific column - say, name - rather than the default id. This guide will address that exact problem and guide you through the solution.

The Problem

Let's consider a scenario where you have a Product model. You want to create methods to get the next and previous products ordered by the name column.

Initially, your approach looks something like this:

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

However, this code fails to order the records based on the name column, as the conditions where('id', '>', $this->id) and where('id', '<', $this->id) isolate the query to IDs only.

The Solution

To fix this, we need to change the where condition to compare the name column instead of id. Here’s how to do it correctly:

Updated Methods

Here’s the corrected version of the getNextAttribute() and getPreviousAttribute() methods:

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

Breakdown of the Changed Code

Condition Change: In both methods, we've replaced where('id', '>', $this->id) with where('name', '>', $this->name) for the getNextAttribute(), and likewise for getPreviousAttribute().

Ordering: We still maintain the ordering based on the name column using orderBy('name', 'asc') for the next product and orderBy('name', 'desc') for the previous product.

Fallback Values: We kept the fallbacks with ?? FontFamily::first() for next and ?? FontFamily::latest()->first() for previous, ensuring there is always a record returned.

Example Usage

You can use these methods directly within your Product model. For example:

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

In this example, $nextProduct would hold the next product based on the alphabetical order of the names, and $previousProduct would do the same in the reverse order.

Conclusion

Retrieving the next and previous records based on a specific column in Laravel is straightforward once the right approach is applied. By focusing on the name column instead of the id, you can successfully bypass the limitations of the default ordering.

If you found this guide helpful, be sure to check out other Laravel guides that can further enhance your development skills!