Can firstOrNew be used with multiple conditions to check for record existence

The `firstOrNew()` method allows you to check for the existence of a record based on multiple conditions. Here are a few examples:

php
// Check if a record exists based on email and name
$user = User::firstOrNew([
    'email' => '
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    'name' => 'John Doe'
]);

if ($user->exists) {
    // Record exists
    // You can now update the record if needed
    $user->update([
        'phone' => '123-456-7890'
    ]);
} else {
    // Record does not exist
    // You can now save the new record
    $user->save();
}

php
// Check if a record exists based on multiple custom attributes
$product = Product::firstOrNew([
    'uuid' => $uuid,
    'category_id' => $categoryId
]);

if ($product->exists) {
    // Record exists
    // You can now update the record if needed
    $product->update([
        'name' => 'Updated Product Name'
    ]);
} else {
    // Record does not exist
    // You can now save the new record
    $product->save();
}

The key points are:

1. Pass an array of conditions to the `firstOrNew()` method, with the column names as the keys and the values to match.
2. Check the `$model->exists` property to determine if the record already exists in the database.
3. If the record exists, you can update it as needed.
4. If the record does not exist, you can save the new record.

Using `firstOrNew()` with multiple conditions allows you to efficiently check for the existence of a record and perform the appropriate action (update or create) in a single method call, without having to write additional conditional logic.