migration: Drop `group_roles` db table.

1 files changed, 47 insertions, 0 deletions

diff --git a/migrations/auth/20240606_03_BY7Us-drop-group-roles-table.py b/migrations/auth/20240606_03_BY7Us-drop-group-roles-table.py
new file mode 100644
index 0000000..5add4d2
--- /dev/null
+++ b/migrations/auth/20240606_03_BY7Us-drop-group-roles-table.py
@@ -0,0 +1,47 @@
+"""
+Drop 'group_roles' table.
+"""
+import sqlite3
+from yoyo import step
+
+__depends__ = {'20240606_02_ubZri-create-resource-roles-table'}
+
+def drop_group_roles(conn):
+    """Delete `group_roles` and related data."""
+    conn.row_factory = sqlite3.Row
+    cursor = conn.cursor()
+    cursor.execute("DELETE FROM user_roles WHERE role_id IN "
+                   "(SELECT role_id FROM group_roles)")
+    cursor.execute("DELETE FROM roles WHERE role_id IN"
+                 "(SELECT role_id FROM group_roles)")
+    cursor.execute("DROP TABLE IF EXISTS group_roles")
+    cursor.close()
+
+def restore_group_roles(conn):
+    """Restore the `group_roles` table."""
+    
+    conn.row_factory = sqlite3.Row
+    cursor = conn.cursor()
+    cursor.execute(
+        """
+        CREATE TABLE group_roles(
+          group_role_id TEXT PRIMARY KEY,
+          group_id TEXT NOT NULL,
+          role_id TEXT NOT NULL,
+          UNIQUE (group_id, role_id),
+          FOREIGN KEY(group_id) REFERENCES groups(group_id)
+            ON UPDATE CASCADE ON DELETE RESTRICT,
+          FOREIGN KEY(role_id) REFERENCES roles(role_id)
+            ON UPDATE CASCADE ON DELETE RESTRICT
+        ) WITHOUT ROWID
+        """)
+    cursor.execute(
+        """
+        CREATE INDEX idx_tbl_group_roles_cols_group_id
+        ON group_roles(group_id)
+        """)
+    cursor.close()
+
+steps = [
+    step(drop_group_roles, restore_group_roles)
+]