Adding unique check for primary menu

Http/Requests/UpdateMenuRequest.php

@@ -6,7 +6,10 @@ class UpdateMenuRequest extends FormRequest
 {
     public function rules()
     {
-        return [];
+        return [
+            'name' => 'required',
+            'primary' => 'unique:menus',
+        ];
     }
 
     public function authorize()
@@ -16,6 +19,8 @@ class UpdateMenuRequest extends FormRequest
 
     public function messages()
     {
-        return [];
+        return [
+            'primary.unique' => 'Only one menu can be primary at a time.'
+        ];
     }
 }

Resources/views/admin/menus/partials/edit-fields.blade.php

 <div class='form-group{{ $errors->has('name') ? ' has-error' : '' }}'>
     {!! Form::label('name', trans('menu::menu.form.name')) !!}
     {!! Form::text('name', Input::old('name', $menu->name), ['class' => 'form-control', 'placeholder' => trans('menu::menu.form.name')]) !!}
-    {!! $errors->first('Name', '<span class="help-block">:message</span>') !!}
+    {!! $errors->first('name', '<span class="help-block">:message</span>') !!}
 </div>
-<div class="checkbox">
+<div class="checkbox {{ $errors->has('primary') ? ' has-error' : '' }}">
     <label for="primary">
         <input id="primary"
                 name="primary"
@@ -12,5 +12,6 @@
                 {{ ((bool)$menu->primary) ? 'checked' : '' }}
                 value="1" />
         {{ trans('menu::menu.form.primary') }}
+        {!! $errors->first('primary', '<span class="help-block">:message</span>') !!}
     </label>
 </div>