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migrations/env.py

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+from __future__ import with_statement
+
+import logging
+import os
+from logging.config import fileConfig
+
+from flask import current_app
+from alembic import context
+
+config = context.config
+
+# Safe logging configuration
+if config.config_file_name and os.path.exists(config.config_file_name):
+    try:
+        fileConfig(config.config_file_name, disable_existing_loggers=False)
+    except Exception:
+        pass
+
+logger = logging.getLogger("alembic.env")
+
+from mikromon import db
+from mikromon.models import *  # noqa
+
+target_metadata = db.metadata
+
+
+def get_url():
+    return current_app.config.get("SQLALCHEMY_DATABASE_URI")
+
+
+def run_migrations_offline():
+    url = get_url()
+
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        compare_type=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    connectable = db.engine
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()