Modified required to be a closure to allow for logic behind the required field

Author: joshmurrayeu

src/Endpoint/Concerns/SavesData.php

@@ -176,7 +176,7 @@ private function assertDataValid(Context $context, array $data, bool $validateAl
         foreach ($context->fields($context->resource) as $field) {
             $empty = !has_value($data, $field);
 
-            if ($empty && (!$field->required || !$validateAll)) {
+            if ($empty && (!$field->isRequired($context) || !$validateAll)) {
                 continue;
             }
 
@@ -187,7 +187,7 @@ private function assertDataValid(Context $context, array $data, bool $validateAl
                 ];
             };
 
-            if ($empty && $field->required) {
+            if ($empty && $field->isRequired($context)) {
                 $fail('field is required');
             } else {
                 $field->validateValue(get_value($data, $field), $fail, $context->withField($field));

src/OpenApi/OpenApiGenerator.php

@@ -46,14 +46,14 @@ public function generate(JsonApi $api): array
 
                 if ($field->writable) {
                     $updateSchema[$location]['properties'][$field->name] = $fieldSchema;
-                    if ($field->required) {
+                    if ($field->isRequired()) {
                         $updateSchema[$location]['required'][] = $field->name;
                     }
                 }
 
                 if ($field->writableOnCreate) {
                     $createSchema[$location]['properties'][$field->name] = $fieldSchema;
-                    if ($field->required) {
+                    if ($field->isRequired()) {
                         $createSchema[$location]['required'][] = $field->name;
                     }
                 }

src/Schema/Concerns/SetsValue.php

@@ -11,7 +11,7 @@ trait SetsValue
 {
     public ?Closure $writable = null;
     public ?Closure $writableOnCreate = null;
-    public bool $required = false;
+    public ?Closure $required = null;
     public ?Closure $default = null;
     public ?Closure $deserializer = null;
     public ?Closure $setter = null;
@@ -41,9 +41,9 @@ public function writableOnCreate(?Closure $condition = null): static
     /**
      * Mark this field as required.
      */
-    public function required(bool $required = true): static
+    public function required(?Closure $condition = null): static
     {
-        $this->required = $required;
+        $this->required = $condition ?: fn() => true;
 
         return $this;
     }
@@ -121,6 +121,14 @@ public function isWritableOnCreate(Context $context): bool
             ($this->writableOnCreate && ($this->writableOnCreate)($context->model, $context));
     }
 
+    /**
+     * Check if this field is required.
+     */
+    public function isRequired(): bool
+    {
+        return $this->required && ($this->required)();
+    }
+
     /**
      * Deserialize a JSON value to an internal representation.
      */

src/Schema/Field/Relationship.php

@@ -134,7 +134,7 @@ public function getSchema(JsonApi $api): array
             parent::getSchema($api) + [
                 'type' => 'object',
                 'properties' => ['data' => $this->getDataSchema($api)],
-                'required' => $this->required ? ['data'] : [],
+                'required' => $this->isRequired() ? ['data'] : [],
             ];
     }