add nova

nova/src/Fields/Dependent.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace Laravel\Nova\Fields;
+
+use Illuminate\Support\Arr;
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+/**
+ * @phpstan-type TDependentResolver (callable(static, \Laravel\Nova\Http\Requests\NovaRequest, \Laravel\Nova\Fields\FormData):(void))|class-string
+ */
+class Dependent
+{
+    /**
+     * The dependent context.
+     *
+     * @var array<int, string>
+     */
+    public $context = ['create', 'update'];
+
+    /**
+     * The dependent attributes.
+     *
+     * @var array<int, string|\Laravel\Nova\Fields\Field>
+     */
+    public $attributes = [];
+
+    /**
+     * The dependent resolver.
+     *
+     * @var callable
+     *
+     * @phpstan-var TDependentResolver
+     */
+    public $resolver;
+
+    /**
+     * The dependent resolved FormData.
+     *
+     * @var \Laravel\Nova\Fields\FormData|null
+     */
+    public $formData;
+
+    /**
+     * Create a new dependent object.
+     *
+     * @param  string|\Laravel\Nova\Fields\Field|array<int, string|\Laravel\Nova\Fields\Field>  $attributes
+     * @param  callable  $resolver
+     * @param  string|array<int, string>|null  $context
+     *
+     * @phpstan-param TDependentResolver $resolver
+     */
+    public function __construct($attributes, $resolver, $context = null)
+    {
+        $this->context = Arr::wrap($context ?? $this->context);
+
+        $this->resolver = $resolver;
+
+        $this->attributes = collect(Arr::wrap($attributes))->map(function ($item) {
+            /** @var string|\Laravel\Nova\Fields\Field $item */
+            if ($item instanceof MorphTo) {
+                return [$item->attribute, "{$item->attribute}_type"];
+            }
+
+            return $item instanceof Field ? $item->attribute : $item;
+        })->flatten()->all();
+    }
+
+    /**
+     * Handle the dependencies for request.
+     *
+     * @param  \Laravel\Nova\Fields\Field  $field
+     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
+     * @return $this
+     */
+    public function handle(Field $field, NovaRequest $request)
+    {
+        /** @var TDependentResolver|null $resolver */
+        $resolver = (
+            ($request->isCreateOrAttachRequest() && ! in_array('create', $this->context))
+            || ($request->isUpdateOrUpdateAttachedRequest() && ! in_array('update', $this->context))
+        ) ? null : $this->resolver;
+
+        $this->formData = FormData::onlyFrom($request, array_merge($this->attributes, [$field->attribute]));
+
+        if (is_string($resolver) && class_exists($resolver)) {
+            $resolver = new $resolver();
+        }
+
+        if (is_callable($resolver)) {
+            call_user_func($resolver, $field, $request, $this->formData);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get depedent attributes.
+     *
+     * @return array<string, mixed>
+     */
+    public function getAttributes()
+    {
+        return collect($this->attributes)->mapWithKeys(function ($attribute) {
+            return [$attribute => optional($this->formData)->get($attribute)];
+        })->all();
+    }
+}