add nova

nova/src/Fields/ManyToManyCreationRules.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace Laravel\Nova\Fields;
+
+use Illuminate\Support\Arr;
+use Laravel\Nova\Http\Requests\NovaRequest;
+use Laravel\Nova\Rules\NotAttached;
+use Laravel\Nova\Rules\NotExactlyAttached;
+
+trait ManyToManyCreationRules
+{
+    /**
+     * The callback that should be used to set creation rules callback for the pivot actions.
+     *
+     * @var (callable(\Laravel\Nova\Http\Requests\NovaRequest):(array))|null
+     */
+    public $creationRulesCallback;
+
+    /**
+     * Determine if field allow duplicate relations.
+     *
+     * @var bool
+     */
+    public $allowDuplicateRelations = false;
+
+    /**
+     * Set creation rules callback for this relation.
+     *
+     * @param  (callable(\Laravel\Nova\Http\Requests\NovaRequest):(array))|null  $callback
+     * @return $this
+     */
+    public function creationRules($callback = null)
+    {
+        $this->creationRulesCallback = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Set allow same relation rules.
+     *
+     * @return $this
+     */
+    public function allowDuplicateRelations()
+    {
+        $this->allowDuplicateRelations = true;
+
+        return $this->creationRules(function ($request) {
+            return [
+                new NotExactlyAttached($request, $request->findModelOrFail()),
+            ];
+        });
+    }
+
+    /**
+     * Set disallow same relation rules.
+     *
+     * @return $this
+     */
+    public function noDuplicateRelations()
+    {
+        $this->allowDuplicateRelations = false;
+
+        return $this->creationRules(function ($request) {
+            return [
+                new NotAttached($request, $request->findModelOrFail()),
+            ];
+        });
+    }
+
+    /**
+     * Get the creation rules for this field.
+     *
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return array<int, string|\Illuminate\Validation\Rule|\Illuminate\Contracts\Validation\Rule|callable>
+     */
+    public function getManyToManyCreationRules(NovaRequest $request)
+    {
+        return transform($this->creationRulesCallback, function ($callback) use ($request) {
+            return Arr::wrap(call_user_func($callback, $request));
+        }, []);
+    }
+}