feat: add support for DROP IF EXISTS clause

CHANGELOG.md

@@ -3,6 +3,7 @@
 Added
 - Added deprecation warnings to `Connection::runDdl` and `Connection::runDdls` (#98)
 - Added  `ManagesMutations::insertOrUpdateUsingMutation` and `UsesMutations::insertOrUpdateUsingMutation` to do upserts (#109)
+- Added Support for `Schema\Builder::dropIfExists()` (#115)
 
 Changed
 - `Connection::waitForOperation` and `Connection::isDoneOperation` has been removed. (#99)

phpstan.neon

@@ -25,8 +25,6 @@ parameters:
           path: src/Connection.php
         - message: '#^Cannot cast mixed to int\.$#'
           path: src/Eloquent/Model.php
-        - message: '#^Method Colopl\\Spanner\\Schema\\Builder::createBlueprint\(\) should return Illuminate\\Database\\Schema\\Blueprint but returns mixed\.$#'
-          path: src/Schema/Builder.php
         - message: '#^Property Illuminate\\Database\\Schema\\Builder::\$resolver \(Closure\) in isset\(\) is not nullable\.$#'
           path: src/Schema/Builder.php
         - message: '#^Using nullsafe method call on non-nullable type Illuminate\\Database\\DatabaseTransactionsManager\. Use -> instead\.$#'

src/Schema/Grammar.php

@@ -327,7 +327,7 @@ public function compileDrop(Blueprint $blueprint, Fluent $command)
      */
     public function compileDropIfExists(Blueprint $blueprint, Fluent $command)
     {
-        return $this->compileDrop($blueprint, $command);
+        return 'drop table if exists '.$this->wrapTable($blueprint);
     }
 
     /**

tests/Schema/BlueprintTest.php

@@ -62,7 +62,7 @@ public function testCreateTable(): void
         );
     }
 
-    public function testDropTable(): void
+    public function test_dropTable(): void
     {
         $conn = $this->getDefaultConnection();
 
@@ -77,6 +77,23 @@ public function testDropTable(): void
         );
     }
 
+    public function test_dropIfExists(): void
+    {
+        $conn = $this->getDefaultConnection();
+
+        $blueprint = new Blueprint('Test3', function (Blueprint $table) {
+            $table->dropIfExists();
+        });
+
+        $queries = $blueprint->toSql($conn, new Grammar());
+        $this->assertEquals(
+            'drop table if exists `Test3`',
+            $queries[0]
+        );
+
+        $this->assertTrue($conn->statement($queries[0]));
+    }
+
     public function testAddColumn(): void
     {
         $conn = $this->getDefaultConnection();