Search object by slug and not by id

# Searching by Slug vs. ID in Laravel: Why Your Lookup Fails (And How to Fix It) Welcome to the world of Laravel! If you’re diving into framework development, it’s completely normal to hit roadblocks, especially when moving from working tutorials to independent experimentation. You've successfully navigated setting up routes and fetching data by ID—that’s a huge first step! However, the confusion you’re experiencing when trying to switch to searching by a `slug` instead of an `id` is a very common stumbling block that touches upon how Eloquent models interact with your database. As a senior developer, I can tell you that this issue is rarely about caching or route clearing; it’s usually about understanding the fundamental relationship between your model's primary key and the data you are trying to query. Let’s break down exactly what went wrong and how to implement a robust solution using Laravel's Eloquent features. ## The ID vs. Slug Confusion: Understanding Primary Keys You started correctly by using the primary key (`id`) because that is the most direct way for the database to locate a specific record. When you use `$article = ww_articles::find($id);`, Eloquent knows exactly which row to fetch based on the unique integer ID. This works flawlessly because the `id` column is indexed and defined as the primary key in your database table. The problem arises when you try to switch this logic to the `slug`. A slug is a human-readable string, often used for URLs, and while it should be unique, it is typically *not* the primary key of the table. If you attempt `$article = ww_articles::find($slug);`, Eloquent looks for an integer ID matching the value in the `slug` column. Since "secondarticle" is not an integer ID, the query fails and returns `null`. This highlights a crucial distinction: 1. **Primary Key (`id`):** The internal, immutable unique identifier used by the database for record linkage. Always use this for direct retrieval via `find()`. 2. **Slug:** A custom field you store in your table (like `name`, `title`, or an auto-generated string) used for user-friendly URLs and searching. ## The Correct Approach: Querying by Non-Primary Keys To retrieve a record based on a non-primary key like a slug, you must explicitly tell Eloquent to search across a specific column using the `where()` method. This forces the query to look at the actual data in your table rather than searching for an integer ID. Here is how you should refactor your controller method: ```php use App\Models\Article; // Assuming you are using a Model class use Illuminate\Http\Request