add nova

nova/src/Fields/MorphToActionTarget.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Laravel\Nova\Fields;
+
+use Illuminate\Database\Eloquent\Relations\Relation;
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class MorphToActionTarget extends MorphTo
+{
+    /**
+     * The field's component.
+     *
+     * @var string
+     */
+    public $component = 'morph-to-action-target-field';
+
+    /**
+     * Determine if the field is not redundant.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return bool
+     */
+    public function isNotRedundant(NovaRequest $request)
+    {
+        return true;
+    }
+
+    /**
+     * Resolve the field's value.
+     *
+     * @param  mixed  $resource
+     * @param  string|null  $attribute
+     * @return void
+     */
+    public function resolve($resource, $attribute = null)
+    {
+        parent::resolve($resource, $attribute);
+
+        if (empty($this->value)) {
+            $morphToType = $resource->getAttribute("{$this->attribute}_type");
+            $morphToId = $resource->getAttribute("{$this->attribute}_id");
+
+            $this->morphToType = Relation::getMorphedModel($morphToType) ?? $morphToType;
+            $this->morphToId = $this->value = (string) $morphToId;
+            $this->viewable = false;
+        }
+    }
+}