【发布时间】：2021-07-01 02:16:58
【问题描述】：
点击此链接：https://alembic.sqlalchemy.org/en/latest/cookbook.html#don-t-generate-any-drop-table-directives-with-autogenerate 我希望 flask db migrate 忽略我的应用程序上下文之外的现有表，我认为我需要做的就是从链接中添加函数并将其设置在上下文中。
这是我的 env.py 文件，但 flask migrate 仍然出错，因为我的“测试”表存在于我的数据库中，但不存在于我的模型中：
from __future__ import with_statement
import logging
from logging.config import fileConfig
from flask import current_app
from alembic import context
# 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)
logger = logging.getLogger('alembic.env')
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
config.set_main_option(
'sqlalchemy.url',
str(current_app.extensions['migrate'].db.get_engine().url).replace(
'%', '%%'))
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.
"""
def include_object(object, name, type_, reflected, compare_to):
if type_ == "table" and reflected and compare_to is None:
return False
else:
return True
url = config.get_main_option("sqlalchemy.url")
context.configure(
url=url,
include_object=include_object,
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 Engine
and associate a connection with the context.
"""
# this callback is used to prevent an auto-migration from being generated
# when there are no changes to the schema
# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
def process_revision_directives(context, revision, directives):
if getattr(config.cmd_opts, 'autogenerate', False):
script = directives[0]
if script.upgrade_ops.is_empty():
directives[:] = []
logger.info('No changes in schema detected.')
def include_object(object, name, type_, reflected, compare_to):
if type_ == "table" and reflected and compare_to is None:
return False
else:
return True
connectable = current_app.extensions['migrate'].db.get_engine()
with connectable.connect() as connection:
context.configure(
include_object=include_object,
connection=connection,
target_metadata=target_metadata,
process_revision_directives=process_revision_directives,
**current_app.extensions['migrate'].configure_args
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()
这是运行迁移的脚本：
flask db init || true
flask db migrate -m "db migration."
flask db upgrade
这是错误：
raise exc.NoSuchTableError(table.name)
sqlalchemy.exc.NoSuchTableError: testing
【问题讨论】：