Drop PostGIS extension if it exists

Author: gbuckingham89

src/Schema/Blueprint.php

@@ -148,4 +148,15 @@ public function disablePostgis()
         return $this->addCommand('disablePostgis');
     }
 
+    /**
+     * Disable postgis on this database.
+     * WIll drop the extension in the database if it exists.
+     *
+     * @return \Illuminate\Support\Fluent
+     */
+    public function disablePostgisIfExists()
+    {
+        return $this->addCommand('disablePostgisIfExists');
+    }
+
 }

src/Schema/Builder.php

@@ -54,4 +54,17 @@ public function disablePostgis()
             $this->grammar->compileDisablePostgis()
         );
     }
+
+    /**
+     * Disable postgis on this database.
+     * WIll drop the extension in the database if it exists.
+     *
+     * @return bool
+     */
+    public function disablePostgisIfExists()
+    {
+        return $this->connection->statement(
+            $this->grammar->compileDisablePostgisIfExists()
+        );
+    }
 }

src/Schema/Grammars/PostgisGrammar.php

@@ -153,6 +153,16 @@ public function compileDisablePostgis()
         return 'DROP EXTENSION postgis';
     }
 
+    /**
+     * Adds a statement to drop the postgis extension, if it exists
+     *
+     * @return string
+     */
+    public function compileDisablePostgisIfExists()
+    {
+        return 'DROP EXTENSION IF EXISTS postgis';
+    }
+
     /**
      * Adds a statement to add a geometry column
      *

tests/Schema/BlueprintTest.php

@@ -107,4 +107,13 @@ public function testDisablePostgis()
 
         $this->blueprint->disablePostgis();
     }
+
+    public function testDisablePostgisIfExists()
+    {
+        $this->blueprint
+            ->shouldReceive('addCommand')
+            ->with('disablePostgis', []);
+
+        $this->blueprint->disablePostgisIfExists();
+    }
 }

tests/Schema/Grammars/PostgisGrammarTest.php

@@ -294,6 +294,16 @@ public function testDisablePostgis()
         $this->assertStringContainsString('DROP EXTENSION postgis', $statements[0]);
     }
 
+    public function testDisablePostgisIfExists()
+    {
+        $blueprint = new Blueprint('test');
+        $blueprint->disablePostgisIfExists();
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);;
+        $this->assertStringContainsString('DROP EXTENSION IF EXISTS postgis', $statements[0]);
+    }
+
     /**
      * @return Connection
      */