fix for Nova 2.0.10

resources/sass/field.scss

@@ -1,10 +1,13 @@
 .tabs-component {
-  margin: 1em 1.5em;
+  margin:25px;
+  padding-top:25px;
+  padding-bottom:25px;
 }
 
 .px-6 .tabs-component {
-  margin-left: 0;
-  margin-right: 0;
+  margin: 0px;
+  padding-top: 10px;
+  padding-bottom: 10px;
 }
 
 .tabs-component-tabs {

src/NovaTab.php

@@ -5,6 +5,8 @@
 use Laravel\Nova\Fields\Field;
 use Laravel\Nova\ResourceTool;
 use Illuminate\Http\Resources\MergeValue;
+use Laravel\Nova\Http\Requests\NovaRequest;
+use Laravel\Nova\Panel;
 
 class NovaTab extends MergeValue implements \JsonSerializable
 {
@@ -49,9 +51,11 @@ class NovaTab extends MergeValue implements \JsonSerializable
     public function __construct($name, $fields = [], $html = null, $errorCallback = null)
     {
         $this->name = $name;
-        $this->hasErrorCallback = $errorCallback;
-
-        parent::__construct($this->prepareFields($fields, $html));
+	$this->hasErrorCallback = $errorCallback;
+	if (app(NovaRequest::class)->isCreateOrAttachRequest()) {
+            $this->panel = Panel::defaultNameForCreate(app(NovaRequest::class)->newResource());
+	}
+	parent::__construct($this->prepareFields($fields, $html));
     }
 
     /**
@@ -82,7 +86,8 @@ protected function prepareFields($fields, $html)
 
         return collect(is_callable($fields) ? $fields() : $fields)
             ->each(function ($field) use ($html, $hasError) {
-                if ($field instanceof Field || $field instanceof ResourceTool) {
+	        if ($field instanceof Field || $field instanceof ResourceTool) {
+                    $field->panel = $this->panel;
                     $field->withMeta([
                         'tab' => $this->name,
                         'tabHTML' => $html,

src/NovaTabs.php

@@ -3,6 +3,8 @@
 namespace R64\NovaTab;
 
 use Laravel\Nova\Fields\Field;
+use Laravel\Nova\Panel;
+use Laravel\Nova\Http\Requests\NovaRequest;
 
 class NovaTabs extends Field
 {
@@ -12,4 +14,36 @@ class NovaTabs extends Field
      * @var string
      */
     public $component = 'nova-tabs';
+
+    /**
+    * Prepare the field for JSON serialization.
+    *
+    * @return array
+    */
+    public function jsonSerialize()
+    {
+        if (empty($this->meta()['fields'][0]->panel)) {
+            if ($id = app(NovaRequest::class)->resourceId) {
+                $this->panel = Panel::defaultNameForUpdate(app(NovaRequest::class)->findResourceOrFail($id));
+            } else {
+                $this->panel = Panel::defaultNameForUpdate(app(NovaRequest::class)->newResource());
+            }
+        } else {
+            $this->panel = $this->meta()['fields'][0]->panel;
+        }
+
+        return array_merge([
+            'component' => $this->component(),
+            'prefixComponent' => true,
+            'indexName' => $this->name,
+            'name' => $this->name,
+            'attribute' => $this->attribute,
+            'value' => $this->value,
+            'panel' => $this->panel,
+            'sortable' => $this->sortable,
+            'nullable' => $this->nullable,
+            'readonly' => $this->isReadonly(app(NovaRequest::class)),
+            'textAlign' => $this->textAlign,
+        ], $this->meta());
+    }
 }

src/Tabs.php

@@ -5,6 +5,7 @@
 use Laravel\Nova\Panel;
 use Illuminate\Support\Collection;
 use Laravel\Nova\Http\Requests\NovaRequest;
+use Laravel\Nova\Fields\FieldCollection;
 
 trait Tabs
 {
@@ -24,9 +25,9 @@ public function updateFields(NovaRequest $request)
      * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
      * @return array
      */
-    public function serializeForDetail(NovaRequest $request)
+    public function serializeForDetail(NovaRequest $request, \Laravel\Nova\Resource $resource)
     {
-        $detailFields = parent::serializeForDetail($request);
+        $detailFields = parent::serializeForDetail($request, $resource);
         $detailFields['fields'] = $this->availableTabs($request, $detailFields['fields']);
         return $detailFields;
     }
@@ -62,7 +63,7 @@ public function availableTabs(NovaRequest $request, $fields)
                 $fields = $fields->all();
             }
             $this->assignFieldsToTabs($request, $fields);
-            return collect([
+            return FieldCollection::make([
                 (NovaTabs::make('tabs'))
                     ->withMeta(['fields' => array_values($fields)])
             ]);
@@ -73,14 +74,32 @@ public function availableTabs(NovaRequest $request, $fields)
     protected function assignFieldsToTabs(NovaRequest $request, $fields)
     {
         foreach ($fields as $field) {
-            $name = $field->meta['tab'] ?? Panel::defaultNameFor($request->newResource());
+            $name = $field->meta['tab'] ?? Panel::defaultNameForCreate($request->newResource());
             $field->meta['tab'] = [
                 'name' => $name,
                 'html' => $field->meta['tabHTML'] ?? $name,
-                'error' => $field->meta['hasError']
+                'error' => array_key_exists('hasError', $field->meta) ? $field->meta['hasError'] : ''
             ];
         }
 
         return $fields;
     }
+
+    /**
+    * Assign the fields with the given panels to their parent panel.
+    *
+    * @param  string                           $label
+    * @param  \Laravel\Nova\Fields\FieldCollection   $fields
+    * @return \Laravel\Nova\Fields\FieldCollection
+    */
+    protected function assignToPanels($label, FieldCollection $fields)
+    {
+        return $fields->map(function ($field) use ($label) {
+            if (! $field->panel) {
+                $field->panel = $label;
+            }
+
+            return $field;
+        });
+    }
 }