Make newBuilder() method on Model public

Author: robgridley

src/Model.php

@@ -657,7 +657,7 @@ protected function isCompoundKey($key)
      *
      * @return Builder
      */
-    protected function newBuilder()
+    public function newBuilder()
     {
         return new Builder($this);
     }

tests/ModelTest.php

@@ -124,6 +124,7 @@ public function testHasMany()
         $model = new Model($client, 'Job');
         $model->job = '12345';
         $related = Mockery::mock(Model::class);
+        $related->shouldReceive('newBuilder')->passthru();
         $client->shouldReceive('model')->with('JobPart')->once()->andReturn($related);
         $builder = $model->hasMany('JobPart', 'job');
         $this->assertInstanceOf(Builder::class, $builder);
@@ -138,6 +139,7 @@ public function testHasManyWithCompoundKey()
         $model = new Model($client, 'JobPart');
         $model->primaryKey = '12345:01';
         $related = Mockery::mock(Model::class);
+        $related->shouldReceive('newBuilder')->passthru();
         $client->shouldReceive('model')->with('JobMaterial')->once()->andReturn($related);
         $builder = $model->hasMany('JobMaterial', 'job:jobPart');
         $this->assertInstanceOf(Builder::class, $builder);
@@ -155,6 +157,7 @@ public function testMorphMany()
         $model = new Model($client, 'Job');
         $model->job = '12345';
         $related = Mockery::mock(Model::class);
+        $related->shouldReceive('newBuilder')->passthru();
         $client->shouldReceive('model')->with('FileAttachment')->once()->andReturn($related);
         $builder = $model->morphMany('FileAttachment');
         $this->assertInstanceOf(Builder::class, $builder);