Fix first version error

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## 0.3
 
+### 0.3.1
+
+- Fix first version error.
+
 ### 0.3.0
 
 - Refactoring migrate logic, and this version is not compatible with previous version.

aerich/__init__.py

@@ -1 +1 @@
-__version__ = "0.3.0"
+__version__ = "0.3.1"

aerich/migrate.py

@@ -67,9 +67,10 @@ class Migrate:
     async def init_with_old_models(cls, config: dict, app: str, location: str):
         await Tortoise.init(config=config)
         last_version = await cls.get_last_version()
-        content = last_version.content
+        if last_version:
-        with open(cls.get_old_model_file(app, location), "w") as f:
+            content = last_version.content
-            f.write(content)
+            with open(cls.get_old_model_file(app, location), "w") as f:
+                f.write(content)
 
         migrate_config = cls._get_migrate_config(config, app, location)
         cls.app = app

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aerich"
-version = "0.3.0"
+version = "0.3.1"
 description = "A database migrations tool for Tortoise ORM."
 authors = ["long2ice <long2ice@gmail.com>"]
 license = "Apache-2.0"