[6.x] Add default_container config option

config/assets.php

@@ -101,6 +101,19 @@
 
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | Default Container
+    |--------------------------------------------------------------------------
+    |
+    | When adding Assets fields to blueprints, Statamic will use this container
+    | as the default. You can override this setting on a field-by-field basis.
+    | Changing this value may break existing asset relationships.
+    |
+    */
+
+    'default_container' => 'assets',
+
     /*
     |--------------------------------------------------------------------------
     | Auto-Crop Assets

src/Fieldtypes/AssetContainer.php

@@ -37,4 +37,9 @@ public function augmentValue($value)
     {
         return Facades\AssetContainer::find($value);
     }
+
+    public function defaultValue()
+    {
+        return config('statamic.assets.default_container');
+    }
 }

src/Fieldtypes/Assets/Assets.php

@@ -41,7 +41,6 @@ protected function configFieldItems(): array
                         'max_items' => 1,
                         'mode' => 'select',
                         'required' => true,
-                        'default' => AssetContainer::all()->count() == 1 ? AssetContainer::all()->first()->handle() : null,
                         'force_in_config' => true,
                         'width' => '50',
                     ],

tests/Auth/HasAvatarTest.php

@@ -27,7 +27,7 @@ public function setUp(): void
 
     private function withAvatarField()
     {
-        $blueprint = Blueprint::makeFromFields(['avatar' => ['type' => 'assets', 'max_files' => 1]]);
+        $blueprint = Blueprint::makeFromFields(['avatar' => ['type' => 'assets', 'max_files' => 1, 'container' => 'avatars']]);
 
         BlueprintRepository::shouldReceive('find')->with('user')->andReturn($blueprint);
 

tests/Fieldtypes/AssetsTest.php

@@ -222,6 +222,7 @@ public function fieldtype($config = [])
     {
         return (new Assets)->setField(new Field('test', array_merge([
             'type' => 'assets',
+            'container' => 'test',
         ], $config)));
     }