correctly handle when the desiredSchemaVersion < schemaVersion

capsulflask/db.py

@@ -60,8 +60,13 @@ def init_app(app):
 
   cursor.execute("SELECT Version FROM schemaversion")
   schemaVersion = cursor.fetchall()[0][0]
-  
-  # print(schemaVersion)
+
+  if schemaVersion > desiredSchemaVersion:
+    print("schemaVersion ({}) > desiredSchemaVersion ({}). schema downgrades are not supported yet. exiting.".format(
+      schemaVersion, desiredSchemaVersion
+    ))
+    exit(1)
+
   while schemaVersion < desiredSchemaVersion:
     migrationKey = "%02d_up" % (schemaVersion+1)
     print("schemaVersion ({}) < desiredSchemaVersion ({}). running migration {}".format(
@@ -94,8 +99,8 @@ def init_app(app):
 
   app.config['PSYCOPG2_CONNECTION_POOL'].putconn(db)
 
-  print("schema migration completed. {}current schemaVersion: \"{}\"".format(
-    ("" if actionWasTaken else "(no action was taken). "), schemaVersion
+  print("{} current schemaVersion: \"{}\"".format(
+    ("schema migration completed." if actionWasTaken else "schema is already up to date. "), schemaVersion
   ))
 
   app.teardown_appcontext(close_db)