Agency can add and remove many workers

app/Entities/Agencies/Agency.php

@@ -3,6 +3,7 @@
 namespace App\Entities\Agencies;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Collection;
 
 class Agency extends Model
 {
@@ -17,4 +18,19 @@ class Agency extends Model
     {
         return $this->hasMany('App\Entities\Projects\Project', 'owner_id');
     }
+
+    public function workers()
+    {
+        return $this->belongsToMany('App\Entities\Users\User', 'agency_workers', 'agency_id', 'worker_id');
+    }
+
+    public function addWorkers(Collection $workers)
+    {
+        $this->workers()->attach($workers);
+    }
+
+    public function removeWorkers(Collection $workers)
+    {
+        $this->workers()->detach($workers);
+    }
 }

database/migrations/2017_11_02_175711_create_agency_workers_table.php

@@ -0,0 +1,37 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateAgencyWorkersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('agency_workers', function (Blueprint $table) {
+            $table->increments('id');
+            $table->unsignedInteger('agency_id');
+            $table->unsignedInteger('worker_id');
+            $table->timestamps();
+
+            $table->unique(['agency_id', 'worker_id'], 'agency_worker_unique');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('agency_workers', function (Blueprint $table) {
+            //
+        });
+    }
+}

tests/Unit/Models/AgencyTest.php

@@ -14,7 +14,7 @@ class AgencyTest extends TestCase
     public function agency_has_an_owner()
     {
         $agency = factory(Agency::class)->create();
-        $this->assertTrue($agency->owner instanceof User);
+        $this->assertInstanceOf(User::class, $agency->owner);
     }
 
     /** @test */
@@ -23,7 +23,37 @@ class AgencyTest extends TestCase
         $agency  = factory(Agency::class)->create();
         $project = factory(Project::class)->create(['owner_id' => $agency->id]);
 
-        $this->assertTrue($agency->projects instanceof Collection);
-        $this->assertTrue($agency->projects->first() instanceof Project);
+        $this->assertInstanceOf(Collection::class, $agency->projects);
+        $this->assertInstanceOf(Project::class, $agency->projects->first());
+    }
+
+    /** @test */
+    public function agency_can_has_many_workers()
+    {
+        $agency  = factory(Agency::class)->create();
+        $workers = factory(User::class, 2)->create();
+
+        $agency->addWorkers($workers);
+
+        $this->assertCount(2, $agency->workers);
+        $this->assertInstanceOf(Collection::class, $agency->workers);
+        $this->assertInstanceOf(User::class, $agency->workers->first());
+    }
+
+    /** @test */
+    public function agency_can_remove_some_workers()
+    {
+        $agency  = factory(Agency::class)->create();
+        $workers = factory(User::class, 2)->create();
+
+        $agency->addWorkers($workers);
+
+        $this->assertCount(2, $agency->workers);
+
+        $agency->removeWorkers($workers->take(1));
+
+        $agency = $agency->fresh();
+        $this->assertCount(1, $agency->workers);
+        $this->assertEquals($workers[1]->id, $agency->workers->first()->id);
     }
 }