Model

app/Models/Foo.php

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+<?php
+
+namespace App\Models;
+
+use App\Scopes\Tenant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Foo extends Model
+{
+    /**
+     * The "booting" method of the model.
+     *
+     * @return void
+     */
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::addGlobalScope(Tenant::class);
+    }
+
+}

app/Scopes/Tenant.php

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+<?php
+
+namespace App\Scopes;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Scope;
+
+class Tenant implements Scope
+{
+
+    /**
+     * Apply the scope to a given Eloquent query builder.
+     *
+     * @param  \Illuminate\Database\Eloquent\Builder $builder
+     * @param  \Illuminate\Database\Eloquent\Model $model
+     * @return void
+     */
+    public function apply(Builder $builder, Model $model)
+    {
+        $builder->where('tenant_id', \Auth::user()->id);
+    }
+}

database/migrations/2018_09_14_215344_create_foos_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateFoosTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('foos', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('baz');
+            $table->unsignedInteger('tenant_id');
+            $table->foreign('tenant_id')->on('tenants')->references('id');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('foos');
+    }
+}