Project structue(only directory with DB migrations):
--db_manage:alembic.ini--alembic:env.pyscript.py.makoREADME--versions:#migration files
When I try to run command: python db_manage/alembic/env.py
, I have response like:
Traceback (most recent call last):File "db_manage/alembic/env.py", line 8, in <module>config = context.config
AttributeError: module 'alembic.context' has no attribute 'config'
In which case I have that problem?
P.S.
File alembic.ini
:
# A generic, single database configuration.[alembic]
# path to migration scripts
script_location = alembic# template used to generate migration files
# file_template = %%(rev)s_%%(slug)s# max length of characters to apply to the
# "slug" field
#truncate_slug_length = 40# set to 'true' to run the environment during
# the 'revision' command, regardless of autogenerate
# revision_environment = false# set to 'true' to allow .pyc and .pyo files without
# a source .py file to be detected as revisions in the
# versions/ directory
# sourceless = false# version location specification; this defaults
# to numus/versions. When using multiple version
# directories, initial revisions must be specified with --version-path
# version_locations = %(here)s/bar %(here)s/bat numus/versions# the output encoding used when revision files
# are written from script.py.mako
# output_encoding = utf-8sqlalchemy.url = postgresql://test:oe50yxXOspYDsaXSO7Gf@localhost/test# Logging configuration
[loggers]
keys = root,sqlalchemy,alembic[handlers]
keys = console[formatters]
keys = generic[logger_root]
level = WARN
handlers = console
qualname =[logger_sqlalchemy]
level = WARN
handlers =
qualname = sqlalchemy.engine[logger_alembic]
level = INFO
handlers =
qualname = alembic[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic[formatter_generic]
format = %(levelname)-5.5s [%(name)s] %(message)s
datefmt = %H:%M:%S
File env.py
:
from __future__ import with_statement
from alembic import context
from sqlalchemy import engine_from_config, pool
from logging.config import fileConfig# 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)# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = None# 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 URLand not an Engine, though an Engine is acceptablehere as well. By skipping the Engine creationwe don't even need a DBAPI to be available.Calls to context.execute() here emit the given string to thescript output."""url = config.get_main_option("sqlalchemy.url")context.configure(url=url, target_metadata=target_metadata, literal_binds=True)with context.begin_transaction():context.run_migrations()def run_migrations_online():"""Run migrations in 'online' mode.In this scenario we need to create an Engineand associate a connection with the context."""connectable = engine_from_config(config.get_section(config.config_ini_section),prefix='sqlalchemy.',poolclass=pool.NullPool)with connectable.connect() as connection:context.configure(connection=connection,target_metadata=target_metadata)with context.begin_transaction():context.run_migrations()if context.is_offline_mode():run_migrations_offline()
else:run_migrations_online()