haldis/app/migrations/env.py

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"Script that runs migrations online or offline"
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from logging.config import fileConfig
from alembic import context
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# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
from flask import current_app
from sqlalchemy import engine_from_config, pool
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name)
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config.set_main_option(
"sqlalchemy.url", current_app.config.get("SQLALCHEMY_DATABASE_URI")
)
target_metadata = current_app.extensions["migrate"].db.metadata
# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
def run_migrations_offline():
"""Run migrations in 'offline' mode.
This configures the context with just a URL
and not an Engine, though an Engine is acceptable
here as well. By skipping the Engine creation
we don't even need a DBAPI to be available.
Calls to context.execute() here emit the given string to the
script output.
"""
url = config.get_main_option("sqlalchemy.url")
context.configure(url=url)
with context.begin_transaction():
context.run_migrations()
def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
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engine = engine_from_config(
config.get_section(config.config_ini_section),
prefix="sqlalchemy.",
poolclass=pool.NullPool,
)
connection = engine.connect()
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context.configure(
connection=connection,
target_metadata=target_metadata,
**current_app.extensions["migrate"].configure_args
)
try:
with context.begin_transaction():
context.run_migrations()
finally:
connection.close()
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if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()