New code.

app/Http/Requests/BudgetFormRequest.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace FireflyIII\Http\Requests;
+
+use Auth;
+use FireflyIII\Models\Budget;
+use Input;
+
+/**
+ * Class BudgetFormRequest
+ *
+ * @package FireflyIII\Http\Requests
+ */
+class BudgetFormRequest extends Request
+{
+    /**
+     * @return bool
+     */
+    public function authorize()
+    {
+        // Only allow logged in users
+        return Auth::check();
+    }
+
+    /**
+     * @return array
+     */
+    public function rules()
+    {
+
+        $nameRule = 'required|between:1,100|uniqueForUser:budgets,name';
+        if (Budget::find(Input::get('id'))) {
+            $nameRule = 'required|between:1,100';
+        }
+
+        return [
+            'name' => $nameRule,
+        ];
+    }
+}