[7.x] Add the ability to create indexes as expressions

src/Illuminate/Database/Schema/Blueprint.php

@@ -5,6 +5,7 @@
 use BadMethodCallException;
 use Closure;
 use Illuminate\Database\Connection;
+use Illuminate\Database\Query\Expression;
 use Illuminate\Database\Schema\Grammars\Grammar;
 use Illuminate\Database\SQLiteConnection;
 use Illuminate\Support\Fluent;
@@ -521,6 +522,18 @@ public function spatialIndex($columns, $name = null)
         return $this->indexCommand('spatialIndex', $columns, $name);
     }
 
+    /**
+     * Specify a raw index for the table.
+     *
+     * @param  string  $expression
+     * @param  string  $name
+     * @return \Illuminate\Support\Fluent
+     */
+    public function rawIndex($expression, $name)
+    {
+        return $this->index([new Expression($expression)], $name);
+    }
+
     /**
      * Specify a foreign key for the table.
      *

tests/Database/DatabaseMySqlSchemaGrammarTest.php

@@ -363,6 +363,16 @@ public function testAddingFluentSpatialIndex()
         $this->assertSame('alter table `geo` add spatial index `geo_coordinates_spatialindex`(`coordinates`)', $statements[1]);
     }
 
+    public function testAddingRawIndex()
+    {
+        $blueprint = new Blueprint('users');
+        $blueprint->rawIndex('(function(column))', 'raw_index');
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table `users` add index `raw_index`((function(column)))', $statements[0]);
+    }
+
     public function testAddingForeignKey()
     {
         $blueprint = new Blueprint('users');

tests/Database/DatabasePostgresSchemaGrammarTest.php

@@ -268,6 +268,16 @@ public function testAddingFluentSpatialIndex()
         $this->assertSame('create index "geo_coordinates_spatialindex" on "geo" using gist ("coordinates")', $statements[1]);
     }
 
+    public function testAddingRawIndex()
+    {
+        $blueprint = new Blueprint('users');
+        $blueprint->rawIndex('(function(column))', 'raw_index');
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('create index "raw_index" on "users" ((function(column)))', $statements[0]);
+    }
+
     public function testAddingIncrementingID()
     {
         $blueprint = new Blueprint('users');

tests/Database/DatabaseSQLiteSchemaGrammarTest.php

@@ -252,6 +252,16 @@ public function testAddingFluentSpatialIndex()
         $blueprint->toSql($this->getConnection(), $this->getGrammar());
     }
 
+    public function testAddingRawIndex()
+    {
+        $blueprint = new Blueprint('users');
+        $blueprint->rawIndex('(function(column))', 'raw_index');
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('create index "raw_index" on "users" ((function(column)))', $statements[0]);
+    }
+
     public function testAddingIncrementingID()
     {
         $blueprint = new Blueprint('users');

tests/Database/DatabaseSqlServerSchemaGrammarTest.php

@@ -277,6 +277,16 @@ public function testAddingFluentSpatialIndex()
         $this->assertSame('create spatial index "geo_coordinates_spatialindex" on "geo" ("coordinates")', $statements[1]);
     }
 
+    public function testAddingRawIndex()
+    {
+        $blueprint = new Blueprint('users');
+        $blueprint->rawIndex('(function(column))', 'raw_index');
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('create index "raw_index" on "users" ((function(column)))', $statements[0]);
+    }
+
     public function testAddingIncrementingID()
     {
         $blueprint = new Blueprint('users');