fix: add a primary key to an existing table

Author: michalsn

system/Database/Forge.php

@@ -1084,12 +1084,10 @@ public function processIndexes(string $table): bool
 
         if (! empty($this->keys)) {
             $sqls = $this->_processIndexes($this->db->DBPrefix . $table, true);
+        }
 
-            $pk = $this->_processPrimaryKeys($table, true);
-
-            if ($pk !== '') {
-                $sqls[] = $pk;
-            }
+        if (! empty($this->primaryKeys)) {
+            $sqls[] = $this->_processPrimaryKeys($table, true);
         }
 
         $this->foreignKeys = $fk;

tests/system/Database/Live/ForgeTest.php

@@ -1657,6 +1657,87 @@ public function testProcessIndexes(): void
         $this->forge->dropTable('user2', true);
     }
 
+    public function testProcessIndexesWithKeyOnly(): void
+    {
+        // make sure tables don't exist
+        $this->forge->dropTable('actions', true);
+
+        $this->createActionsTable();
+        $this->forge->addKey('name', false, false, 'db_actions_name');
+
+        // create indexes
+        $this->forge->processIndexes('actions');
+
+        // get a list of all indexes
+        $allIndexes = $this->db->getIndexData('actions');
+
+        // check that db_actions_name key exists
+        $indexes = array_filter(
+            $allIndexes,
+            static fn ($index) => ($index->name === 'db_actions_name')
+                && ($index->fields === [0 => 'name'])
+        );
+        $this->assertCount(1, $indexes);
+
+        // drop tables to avoid any future conflicts
+        $this->forge->dropTable('actions', true);
+    }
+
+    public function testProcessIndexesWithPrimaryKeyOnly(): void
+    {
+        // make sure tables don't exist
+        $this->forge->dropTable('actions', true);
+
+        $this->createActionsTable();
+        $this->forge->addPrimaryKey('id');
+
+        // create indexes
+        $this->forge->processIndexes('actions');
+
+        // get a list of all indexes
+        $allIndexes = $this->db->getIndexData('actions');
+
+        // check that the primary key exists
+        $indexes = array_filter(
+            $allIndexes,
+            static fn ($index) => $index->type === 'PRIMARY'
+        );
+        $this->assertCount(1, $indexes);
+
+        // drop tables to avoid any future conflicts
+        $this->forge->dropTable('actions', true);
+    }
+
+    public function testProcessIndexesWithForeignKeyOnly(): void
+    {
+        // make sure tables don't exist
+        $this->forge->dropTable('actions', true);
+        $this->forge->dropTable('user2', true);
+
+        $this->createUser2TableWithKeys();
+        $this->populateUser2Table();
+        $this->createActionsTable();
+
+        // SQLite does not support custom foreign key name
+        if ($this->db->DBDriver === 'SQLite3') {
+            $this->forge->addForeignKey('userid', 'user', 'id');
+            $this->forge->addForeignKey('userid2', 'user2', 'id');
+        } else {
+            $this->forge->addForeignKey('userid', 'user', 'id', '', '', 'db_actions_userid_foreign');
+            $this->forge->addForeignKey('userid2', 'user2', 'id', '', '', 'db_actions_userid2_foreign');
+        }
+
+        // create indexes
+        $this->forge->processIndexes('actions');
+
+        // check that the two foreign keys exist
+        $this->assertCount(2, $this->db->getForeignKeyData('actions'));
+
+        // drop tables to avoid any future conflicts
+        $this->forge->dropTable('actions', true);
+        $this->forge->dropTable('user2', true);
+    }
+
     private function createUser2TableWithKeys(): void
     {
         $fields = [

user_guide_src/source/changelogs/v4.4.2.rst

@@ -42,6 +42,8 @@ Bugs Fixed
   Page Not Found.
 - **Spark:** Fixed a bug that caused spark to not display exceptions in the
   production mode or to display backtrace in json when an exception occurred.
+- **Forge:** Fixed a bug where adding a Primary Key to an existing table was
+  ignored if there were no other Keys added too.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_