Eloquent model mass update

Perhaps this was not possible a few years ago but in recent versions of Laravel you can definitely do:

User::where('age', '<', 18)->update(['under_18' => 1]);

Worth noting that you need the where method before calling update.

For mass update/insert features, it was requested but Taylor Otwell (Laravel author) suggest that users should use Query Builder instead. https://github.com/laravel/framework/issues/1295

Your models should generally extend Illuminate\Database\Eloquent\Model. Then you access the entity iself, for example if you have this:

<?php
Use Illuminate\Database\Eloquent\Model;

class User extends Model {

    // table name defaults to "users" anyway, so this definition is only for
    // demonstration on how you can set a custom one
    protected $table = 'users';
    // ... code omited ...

Update #2

You have to resort to query builder. To cover table naming issue, you could get it dynamically via getTable() method. The only limitation of this is that you need your user class initialized before you can use this function. Your query would be as follows:

$userTable = (new User())->getTable();
DB::table($userTable)->where('age', '<', 18)->update(array('under_18' => 1));

This way your table name is controller in User model (as shown in the example above).

Update #1

Other way to do this (not efficient in your situation) would be:

$users = User::where('age', '<', 18)->get();
foreach ($users as $user) {
    $user->field = value;
    $user->save();
}

This way the table name is kept in users class and your developers don't have to worry about it.

A litle correction to @metamaker answer:

DB::beginTransaction();
     // do all your updates here
        foreach ($users as $user) {
            $new_value = rand(1,10) // use your own criteria
            DB::table('users')
               ->where('id', '=', $user->id)
               ->update(['status' => $new_value  // update your field(s) here
                ]);
        }
    // when done commit
DB::commit();

Now you can have 1 milion different updates in one DB transaction

If you need to update all data without any condition, try below code

Model::query()->update(['column1' => 0, 'column2' => 'New']);

Use database transactions to update multiple entities in a bulk. Transaction will be committed when your update function finished, or rolled back if exception occurred somewhere in between.

https://laravel.com/docs/5.4/database#database-transactions

For example, this is how I regenerate materialized path slugs (https://communities.bmc.com/docs/DOC-9902) for articles in a single bulk update:

public function regenerateDescendantsSlugs(Model $parent, $old_parent_slug)
    {
        $children = $parent->where('full_slug', 'like', "%/$old_parent_slug/%")->get();

        \DB::transaction(function () use ($children, $parent, $old_parent_slug) {
            /** @var Model $child */
            foreach ($children as $child) {
                $new_full_slug  = $this->regenerateSlug($parent, $child);
                $new_full_title = $this->regenerateTitle($parent, $child);

                \DB::table($parent->getTable())
                    ->where('full_slug', '=', $child->full_slug)
                    ->update([
                        'full_slug' => $new_full_slug,
                        'full_title' => $new_full_title,
                    ]);
            }
        });
    }

Laravel 6.*

We can update mass data on query as follow :

Appointment::where('request_id' , $appointment_request->id)->where('user_id', Auth::user()->id)->where('status', '!=', 'Canceled')->where('id', '!=', $appointment->id)->update(['status' => 'Canceled', 'canceled_by' => Auth::user()->id]);

Another example of working code of the mass query and mass update in same instruction:

Coordinate::whereIn('id',$someCoordIdsArray)->where('status','<>',Order::$ROUTE_OPTIMIZED)
       ->update(['status'=>Order::$ROUTE_OPTIMIZED]);

laravel 5.8 you can accomplish mass update like so:

User::where('id', 24)->update (dataAssociativeArray) ;