1. Controller Function and View Setup

Create Edit Function (`AdminController.php`)

First, create a function in the `AdminController` that accepts the brand'sID, finds the brand record, and passes it to the edit view:

public function edit_brand($id)
    {
        $brand = Brand::find($id);
        return view("admin.brand-edit",compact("brand"));
    }

Create Edit View (`brand-edit.blade.php`)

Create a new view file: `resources/views/admin/brand-edit.blade.php`. For efficiency, copy all content from `brand-add.blade.php` and paste it here.

2. Populate Form with Existing Brand Data

Modify the `brand-edit.blade.php` file to display the current brand data in the form fields and image preview.

Set Input Values

Set the `value` property for the Name and Slug input fields:

value="{{$brand->name}}"
value="{{$brand->slug}}"

Display Existing Image

Use conditional logic (`@if`) to display the existing brand image if it exists. If no image is present, hide the image preview:

<div class="mb-3">
@if($brand->image)
<img id="image-preview" src="{{asset("uploads/brands")}}/{{$brand->image}}" alt="Image Preview" style="max-width: 120px; height: auto;">
@else
<img id="image-preview" src="" alt="Image Preview" style="display: none; max-width: 120px; height: auto;">
@endif                                        
</div>

The Remove Image button'sstyle should be set to `display: block;` when an image is present.

3. Update Brand Logic and Routing

Create Update Function (`AdminController.php`)

Create the `update_brand` function to handle the form submission. This function validates the incoming data, handles the image update (deleting the old image if a new one is uploaded), and saves the changes.

use IlluminateSupportFacadesFile;
public function update_brand(Request $request)
{
    $request->validate([
        "id" => "required",
        "name" => "required",
        "slug" => "required|unique:brands,slug," . $request->id,
        "image" => "nullable|mimes:png,jpg,jpeg|max:2048"
    ]);
    $brand = Brand::find($request->id);
    $brand->name = $request->name;
    $brand->slug = Str::slug($request->name);
    if($request->hasFile("image")) {
        // Delete old image if it exists
        if(File::exists(public_path("uploads/brands") . "/" . $brand->image)) {
            File::delete(public_path("uploads/brands") . "/" . $brand->image);
        }
        // Upload new image
        $image = $request->file("image");
        $file_extention = $request->file("image")->extension();
        $file_name = Carbon::now()->timestamp . "." . $file_extention;
        $this->GenerateBrandThumbailsImage($image, $file_name);
        $brand->image = $file_name;
    }
    $brand->save();
    return redirect()->route("admin.brands")->with("status", "Brand has been updated successfully!");
}

Define Route for Update (`web.php`)

Create the `GET` route for the edit page and the `PUT` route for the update logic:

Route::get("/admin/brand/edit/{id}", [AdminController::class, "edit_brand"])->name("admin.brand.edit");
Route::put("/admin/brand/update", [AdminController::class, "update_brand"])->name("admin.brand.update");

4. Final Form Updates in View

In `brand-edit.blade.php`, update the form'saction and method directives to point to the new update route:

<form action="{{route("admin.brand.update")}}" method="POST" enctype="multipart/form-data" data-parsley-validate>
    @csrf
    @method("PUT")
    <!-- Include hidden input for ID -->
    <input type="hidden" name="id" value="{{$brand->id}}">
    <!-- ... other form fields ... -->
</form>

Also, update the Edit link in `brands.blade.php` to use the correct route and pass the brand ID:

 <a href="{{route("admin.brand.edit",["id"=>$brand->id])}}">
<div class="item edit">
<i class="fa fa-edit"></i>
</div>
</a>

5. Testing

Refresh the Brands page, click on the Edit icon for a brand. You should see the edit page populated with the brand'scurrent data. Make changes and click Submit to test the update functionality.