蒸馏器 - SQLAlchemy的不我已经导入我的模型后，使用</p> <pre><code>target_metadata = Base.metadata </code></pre> <p>为</p> <pre><code>alembic revision --autogenerate -m "initial migration" </code></pre> <p>检测如何检测表中的现有表

Question

我问了一个问题（Alembic - sqlalchemy initial migration） env.py文件它似乎工作正常，但它没有检测到实际存在的表，因此它会创建包含所有表的迁移文件，例如：

def upgrade(): 
    ### commands auto generated by Alembic - please adjust! ### 
    op.create_table('Brand', 
    sa.Column('id', sa.Integer(), nullable=False), 
    sa.Column('name', sa.String(), nullable=True), 
    sa.Column('slug', sa.String(), nullable=True), 
    sa.Column('date_created', sa.DateTime(), nullable=True), 
    sa.Column('date_updated', sa.DateTime(), nullable=True), 
    sa.PrimaryKeyConstraint('id'), 
    schema='Products' 
    ) 

def downgrade(): 
    ### commands auto generated by Alembic - please adjust! ### 
    op.drop_table('ProductFile', schema='Products') 

我已经试过：

alembic stamp head 

，但运行和运行自动生成命令后，系统再次产生的所有车型。

from project.apps.users.models import * 
from project.apps.orders.models import * 
from project.apps.products.models import * 

from project.base import Base, metadata 

# 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 = Base.metadata 

我该如何避免这个问题？

编辑：

ENV.py：

https://gist.github.com/pypetey/bb65807ce773d8baeaf1 

我放弃了DB跑迁移

(env) D:\projekty\test>alembic revision --autogenerate 
INFO [alembic.migration] Context impl MSSQLImpl. 
INFO [alembic.migration] Will assume transactional DDL. 
INFO [alembic.autogenerate.compare] Detected added table u'Users.Country' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Brand' 
INFO [alembic.autogenerate.compare] Detected added table u'Users.User' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Product' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.ProductFile 
' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.Order' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Category' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Review' 
INFO [alembic.autogenerate.compare] Detected added table u'Users.UserAddress' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.OrderItem' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.OrderStatus' 
Generating D:\projekty\test\alembic\versions\1c6337c144a7_.py ... done 

(env) D:\projekty\test>alembic upgrade head 
INFO [alembic.migration] Context impl MSSQLImpl. 
INFO [alembic.migration] Will assume transactional DDL. 
INFO [alembic.migration] Running upgrade None -> 1c6337c144a7, empty message 

(env) D:\projekty\test>alembic revision --autogenerate 
INFO [alembic.migration] Context impl MSSQLImpl. 
INFO [alembic.migration] Will assume transactional DDL. 
INFO [alembic.autogenerate.compare] Detected added table u'Users.Country' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Brand' 
INFO [alembic.autogenerate.compare] Detected added table u'Users.User' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Product' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.ProductFile 
' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.Order' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Category' 
INFO [alembic.autogenerate.compare] Detected added table u'Products.Review' 
INFO [alembic.autogenerate.compare] Detected added table u'Users.UserAddress' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.OrderItem' 
INFO [alembic.autogenerate.compare] Detected added table u'Orders.OrderStatus' 
Generating D:\projekty\test\alembic\versions\5abb204549f_.py ... done 

Answer 1

我有此相同的问题 - 我不知道，如果它仍然影响你。对我来说，这个问题是由于我使用的模式不是默认的 - 我认为同样的事情发生在你身上，因为你正在使用“产品”模式。我张贴的问题在：

https://bitbucket.org/zzzeek/alembic/issue/281/autogenerate-fails-to-detect-existing

并指导了一点点，设法通过设置在蒸馏器/ env.py模块中都run_migrations_*功能include_schemas=True来解决问题。

见docs：

如果真，将自动生成跨（）位于由 SQLAlchemy的get_schema_names所有模式法扫描，并且包括在所有这些模式中 表中的所有分歧。当使用此选项时，您可能还想使用EnvironmentContext.configure.include_object 选项来指定一个可调用函数，该函数可以过滤包含 的表/模式。