From a6cf8e465f85507430798f62d7e9f820a832be6e Mon Sep 17 00:00:00 2001
From: Max Korlaar <max@maxkorlaar.com>
Date: Sat, 20 Mar 2021 15:50:12 +0100
Subject: [PATCH 1/2] Allow options to be passed as a callable or closure as
 well, allowing options to be loaded only when the component is shown, instead
 of every time the component is created.

---
 src/BelongsToManyField.php | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/src/BelongsToManyField.php b/src/BelongsToManyField.php
index 0f0753c..101898f 100644
--- a/src/BelongsToManyField.php
+++ b/src/BelongsToManyField.php
@@ -10,6 +10,13 @@
 
 class BelongsToManyField extends Field
 {
+    /**
+     * The callback to be used for the field's options.
+     *
+     * @var array|callable
+     */
+    private $optionsCallback;
+
     public $showOnIndex = true;
     public $showOnDetail = true;
     public $isAction = false;
@@ -35,9 +42,10 @@ class BelongsToManyField extends Field
     /**
      * Create a new field.
      *
-     * @param  string  $name
-     * @param  string|null  $attribute
-     * @param  string|null  $resource
+     * @param string $name
+     * @param string|null $attribute
+     * @param string|null $resource
+     *
      * @return void
      */
     //Code by @drsdre
@@ -77,10 +85,11 @@ public function optionsLabel(string $optionsLabel)
         return $this->withMeta(['optionsLabel' => $this->label]);
     }
 
-    public function options($options)
+    public function options($options = [])
     {
-        $options = collect($options);
-        return $this->withMeta(['options' => $options]);
+        $this->optionsCallback = $options;
+
+        return $this;
     }
 
     public function relationModel($model)
@@ -146,6 +155,14 @@ public function resolve($resource, $attribute = null)
 
     public function jsonSerialize()
     {
+        if (isset($this->optionsCallback)) {
+            if (is_callable($this->optionsCallback)) {
+                $this->withMeta(['options' => call_user_func($this->optionsCallback)]);
+            } else {
+                $this->withMeta(['options' => collect($this->optionsCallback)]);
+            }
+        }
+
         return array_merge([
             'attribute' => $this->attribute,
             'component' => $this->component(),

From 48a8f906cf52a4c5807d85245ced22d9c03e958f Mon Sep 17 00:00:00 2001
From: Max Korlaar <max@maxkorlaar.com>
Date: Sat, 20 Mar 2021 21:35:44 +0100
Subject: [PATCH 2/2] Extract logic to its own function to improve readability

---
 src/BelongsToManyField.php | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/BelongsToManyField.php b/src/BelongsToManyField.php
index 101898f..f945a8e 100644
--- a/src/BelongsToManyField.php
+++ b/src/BelongsToManyField.php
@@ -155,13 +155,7 @@ public function resolve($resource, $attribute = null)
 
     public function jsonSerialize()
     {
-        if (isset($this->optionsCallback)) {
-            if (is_callable($this->optionsCallback)) {
-                $this->withMeta(['options' => call_user_func($this->optionsCallback)]);
-            } else {
-                $this->withMeta(['options' => collect($this->optionsCallback)]);
-            }
-        }
+        $this->resolveOptions();
 
         return array_merge([
             'attribute' => $this->attribute,
@@ -195,4 +189,15 @@ public function setPivot(array $attributes)
 
         return $this;
     }
+
+    private function resolveOptions(): void
+    {
+        if (isset($this->optionsCallback)) {
+            if (is_callable($this->optionsCallback)) {
+                $this->withMeta(['options' => call_user_func($this->optionsCallback)]);
+            } else {
+                $this->withMeta(['options' => collect($this->optionsCallback)]);
+            }
+        }
+    }
 }