Fix for protonemedia#64

Author: pascalbaljet

src/Components/FormRadio.php

@@ -27,7 +27,7 @@ public function __construct(
 
         $inputName = static::convertBracketsToDots($name);
 
-        if (old($inputName)) {
+        if (old($inputName) !== null) {
             $this->checked = old($inputName) == $value;
         }
 

tests/Feature/RadioTest.php

@@ -42,4 +42,20 @@ public function it_does_check_the_right_input_element_after_a_validation_error()
             ->seeElement('input[value="a"]:not(:checked)')
             ->seeElement('input[value="b"]:checked');
     }
+
+    /** @test */
+    public function it_does_check_the_right_input_element_after_a_validation_error_of_another_field()
+    {
+        $this->registerTestRoute('radio-with-zero-value', function (Request $request) {
+            $data = $request->validate([
+                'input' => 'required',
+            ]);
+        });
+
+        $this->visit('/radio-with-zero-value')
+            ->select('0', 'radio')
+            ->press('Submit')
+            ->seeElement('input[value="0"]:checked')
+            ->seeElement('input[value="1"]:not(:checked)');
+    }
 }

tests/Feature/views/radio-with-zero-value.blade.php

@@ -0,0 +1,10 @@
+<x-form>
+    <x-form-input name="input" />
+
+    <x-form-group>
+        <x-form-radio name="radio" value="0" />
+        <x-form-radio name="radio" value="1" />
+    </x-form-group>
+
+    <x-form-submit />
+</x-form>