added suport for gin index

Author: mirzap

src/Bosnadev/Database/Schema/Blueprint.php

@@ -7,6 +7,52 @@
 class Blueprint extends \Illuminate\Database\Schema\Blueprint
 {
 
+    /**
+     * Add the index commands fluently specified on columns.
+     *
+     * @return void
+     */
+    protected function addFluentIndexes()
+    {
+        foreach ($this->columns as $column)
+        {
+            foreach (array('primary', 'unique', 'index', 'gin') as $index)
+            {
+                // If the index has been specified on the given column, but is simply
+                // equal to "true" (boolean), no name has been specified for this
+                // index, so we will simply call the index methods without one.
+                if ($column->$index === true)
+                {
+                    $this->$index($column->name);
+
+                    continue 2;
+                }
+
+                // If the index has been specified on the column and it is something
+                // other than boolean true, we will assume a name was provided on
+                // the index specification, and pass in the name to the method.
+                elseif (isset($column->$index))
+                {
+                    $this->$index($column->name, $column->$index);
+
+                    continue 2;
+                }
+            }
+        }
+    }
+
+    /**
+     * Specify an index for the table.
+     *
+     * @param  string|array  $columns
+     * @param  string  $name
+     * @return \Illuminate\Support\Fluent
+     */
+    public function gin($columns, $name = null)
+    {
+        return $this->indexCommand('gin', $columns, $name);
+    }
+
     /**
      * Create a new character column on the table.
      *
@@ -37,7 +83,7 @@ public function uuid($column) {
 
     /**
      * Create a new jsonb column on the table
-     * 
+     *
      * @param $column
      * @return \Illuminate\Support\Fluent
      */

src/Bosnadev/Database/Schema/Grammars/PostgresGrammar.php

@@ -1,6 +1,7 @@
 <?php namespace Bosnadev\Database\Schema\Grammars;
 
 use Illuminate\Support\Fluent;
+use Bosnadev\Database\Schema\Blueprint;
 
 /**
  * Class PostgresGrammar
@@ -75,4 +76,18 @@ protected function isUuid($value) {
         return preg_match( '/^uuid_generate_v/', $value );
     }
 
+    /**
+     * Compile a gin index key command.
+     *
+     * @param  \Bosnadev\Database\Schema\Blueprint  $blueprint
+     * @param  \Illuminate\Support\Fluent  $command
+     * @return string
+     */
+    public function compileGin(Blueprint $blueprint, Fluent $command)
+    {
+        $columns = $this->columnize($command->columns);
+
+        return "create index {$command->index} on ".$this->wrapTable($blueprint)." using gin ({$columns})";
+    }
+
 }