Laravel5.5中如何修改findOrFail方法的主键名称？

Hey there! Let's get this sorted out for you. The issue has two key parts: telling your Laravel model to use a_id as the primary key, and fixing the incorrect findOrFail call in your controller.

Step 1: Update Your Article Model #

Laravel assumes the primary key is named id by default, so we need to explicitly override this in your Article model.

Open your Article model file (usually located at app/Models/Article.php) and add the $primaryKey property:

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Article extends Model
{
    // Set your custom primary key column name
    protected $primaryKey = 'a_id';

    // Optional: Uncomment these lines ONLY if your `a_id` is not an auto-incrementing integer
    // public $incrementing = false;
    // protected $keyType = 'string'; // Use this if your primary key is a string type
}

Step 2: Fix the findOrFail Call in Your Controller #

Your original findOrFail usage was wrong—this method automatically uses the model's defined primary key, so you don't need to pass the column name as a parameter. Just pass the primary key value directly.

Update your controller method to this:

public function edit($a_id) { 
    $articleData = Article::findOrFail($a_id); 
    return view('Admin.articleEdit')->with('articleData',$articleData); 
}

Why This Works #

By setting $primaryKey = 'a_id' in the model, all Laravel's built-in methods that rely on the primary key (like find, findOrFail, delete, etc.) will now use a_id instead of the default id. The findOrFail method will automatically run a query like SELECT * FROM articles WHERE a_id = ? under the hood, using the value you pass to it.

内容的提问来源于stack exchange，提问作者seven