Feature/string backed enum in order by

src/Illuminate/Database/Grammar.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Database;
 
+use BackedEnum;
 use Illuminate\Contracts\Database\Query\Expression;
 use Illuminate\Support\Collection;
 use Illuminate\Support\Traits\Macroable;
@@ -72,7 +73,7 @@ public function wrapTable($table)
     /**
      * Wrap a value in keyword identifiers.
      *
-     * @param  \Illuminate\Contracts\Database\Query\Expression|string  $value
+     * @param  \Illuminate\Contracts\Database\Query\Expression|\BackedEnum|string  $value
      * @return string
      */
     public function wrap($value)
@@ -81,6 +82,10 @@ public function wrap($value)
             return $this->getValue($value);
         }
 
+        if ($value instanceof BackedEnum) {
+            $value = $value->value;
+        }
+
         // If the value being wrapped has a column alias we will need to separate out
         // the pieces so we can wrap each of the segments of the expression on its
         // own, and then join these both back together using the "as" connector.

src/Illuminate/Database/Query/Builder.php

@@ -2629,7 +2629,7 @@ public function orHavingRaw($sql, array $bindings = [])
     /**
      * Add an "order by" clause to the query.
      *
-     * @param  \Closure|\Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder<*>|\Illuminate\Contracts\Database\Query\Expression|string  $column
+     * @param  \Closure|\Illuminate\Database\Query\Builder|\Illuminate\Database\Eloquent\Builder<*>|\Illuminate\Contracts\Database\Query\Expression|string|\BackedEnum  $column
      * @param  string  $direction
      * @return $this
      *

tests/Database/DatabaseQueryBuilderTest.php

@@ -1979,6 +1979,17 @@ public function testOrderByInvalidDirectionParam()
         $builder->select('*')->from('users')->orderBy('age', 'asec');
     }
 
+    public function testOrderByBackedEnums()
+    {
+        $builder = $this->getBuilder();
+        $builder->select('*')->from('users')->orderBy(StringStatus::done)->orderBy('age', 'desc');
+
+        $builder = $this->getBuilder();
+        $builder->select('*')->from('users')->orderBy(IntegerStatus::done)->orderBy('age', 'desc');
+
+        $this->assertSame('select * from "users" order by "2" asc, "age" desc', $builder->toSql());
+    }
+
     public function testHavings()
     {
         $builder = $this->getBuilder();