Laravel, How to ignore (except) some fields when update model using json and laravel
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Laravel: How to Ignore (Except) Some Fields When Updating Models Using JSON
Updating Eloquent models from incoming JSON requests is a daily task for any Laravel developer. While the basics of mass assignment seem straightforward, handling complex updates—where some fields are optional, others need special hashing, and some must be completely ignored—often introduces tricky logic. The scenario you described, trying to conditionally ignore fields like 'password' if they are empty while managing uniqueness constraints, is a common stumbling block.
As a senior developer, I can tell you that the issue often lies in the order of operations: validation, input filtering, and mass assignment. Simply using `except()` might not be sufficient when dealing with conditional logic tied to data integrity rules like unique email addresses or password hashing.
Let's break down how to achieve robust, clean updates in Laravel, ensuring your code is both functional and adheres to best practices.
## The Pitfalls of Conditional Input Manipulation
Your original approach attempted to use `except()` and manual checks:
```php
$input = $request->all()->except(['country_id', 'region_id']);
if(!empty($input['password'])){
$input['password'] = Hash::make($input['password']);
}else{
$input = array_except($input,array('password'));
}
```
This approach is fragile for several reasons:
1. **Order of Operations:** You are modifying the input array *after* validation has potentially run or before you determine exactly which fields should be assigned.
2. **Redundancy:** Using `array_except` inside a conditional block adds unnecessary complexity. A cleaner approach is to define precisely what data you want to update based on the request.
3. **Security Context:** When dealing with passwords, omitting a field entirely (instead of setting it to null or an empty string) can sometimes lead to unexpected database behavior depending on your Eloquent setup.
## The Robust Solution: Filtering and Conditional Assignment
The most reliable way to handle this is to first define exactly which fields are safe to update based on the request, then handle specialized logic (like hashing), and finally perform the update. We can leverage Laravel's strong validation system here.
Here is a refactored approach that addresses your requirements cleanly:
```php
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use App\Models\User; // Assuming you are using an Eloquent model
public function update(Request $request, $id)
{
// 1. Define base validation rules
$rules = [
'fname' => 'required',
'email' => 'required|email|unique:users,email,' . $id, // Ensure uniqueness check skips the current record
'password' => 'nullable|string', // Make password optional for this update
'roles' => 'required',
];
// 2. Validate the entire request first
$validatedData = $request->validate($rules);
// 3. Prepare data for mass assignment, selectively ignoring fields
$dataToUpdate = $validatedData;
// Ignore fields explicitly (like IDs you don't want to touch)
unset($dataToUpdate['country_id'], $dataToUpdate['region_id']);
// 4. Handle conditional password hashing
if (isset($dataToUpdate['password']) && !empty($dataToUpdate['password'])) {
$dataToUpdate['password'] = Hash::make($dataToUpdate['password']);
} else {
// If password is missing or empty, ensure it is completely removed from the update payload
unset($dataToUpdate['password']);
}
// 5. Execute the update
$user = User::findOrFail($id);
$user->update($dataToUpdate);
// 6. Handle roles (example)
DB::table('model_has_roles')->where('model_id', $id)->delete();
$user->assignRole($request->input('roles'));
return response()->json(['data' => trans('message.success')]);
}
```
## Key Takeaways and Laravel Best Practices
1. **Use `validate()` First:** Always let Laravel handle the initial validation. This separates input hygiene from business logic, making your code cleaner and easier to debug.
2. **Handle Uniqueness Carefully:** When checking for uniqueness (like emails), ensure your `unique` rule correctly excludes the record you are currently updating. Using the model ID as an exclusion parameter (`unique:users,email,$id`) is crucial here.
3. **Conditional Keys:** Instead of relying on array manipulation functions like `array_except`, use standard PHP `unset()` functionality within a controlled flow. This makes the intent clearer to future developers reading your code.
4. **Eloquent Efficiency:** For complex updates involving relationships (like assigning roles), consider using dedicated package features or carefully managing raw SQL operations alongside Eloquent methods, as seen when deleting from pivot tables like in the example above.
By structuring your update logic around explicit validation and clear data preparation steps, you move away from brittle conditional hacks toward a robust, maintainable system—the hallmark of great Laravel development. For more advanced insights into building secure and efficient APIs, always refer to the official documentation found at [https://laravelcompany.com](https://laravelcompany.com).