如何将Pyramid中的不同模型的models.py拆分为不同的文件? [英] How do I split models.py into different files for different models in Pyramid?

问题描述

我刚接触金字塔，一直在努力对我的项目进行一些更改.我正在尝试将模型/类拆分为单个文件，而不是单个models.py文件.为此，我删除了旧的models.py并创建了一个包含__init__.py文件以及每个类一个文件的models文件夹.在__init__.py中，我使用from .Foo import Foo导入了该类.

I am new to pyramid and have been struggling to make some changes to my project. I am trying to split my models/Classes into individual files instead of a single models.py file. In order to do so I have removed the old models.py and created a models folder with __init__.py file along with one file for each class. In __init__.py I imported the class by using from .Foo import Foo.

这可以使视图正常工作，并且它们可以初始化对象.

This makes the views work correctly and they can initialize an object.

但是，当我将所有模型都放在一个models.py中时，运行initializedb脚本不会创建新表.它不会创建相关表，而是直接尝试在其中插入.

But running the initializedb script does not create new tables as it did when I had all the models in a single models.py. It does not create the relevant tables but directly tries to insert in them.

谁能给我一个在不同文件中包含模型的金字塔项目结构的示例吗?

Can anyone give me an example of a pyramid project structure which has models in different files?

推荐答案

myapp
    __init__.py
    scripts
        __init__.py
        initialize_db.py
    models
        __init__.py
        meta.py
        foo.py
        moo.py

现在meta.py可以包含共享的Base以及DBSession:

now meta.py can contain a shared Base as well as the DBSession:

Base = declarative_base()
DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension))

每个foo.py和moo.py都可以从meta.py导入其共享库.

Each foo.py and moo.py can import their shared base from meta.py.

from .meta import Base

class Foo(Base):
    pass

要确保从models子包中拾取所有表，并且为了方便起见，可以将它们导入models/__init__.py:

To ensure that all of your tables are picked up, from within the models subpackage, and for convenience, you can import them into models/__init__.py:

from .meta import DBSession
from .foo import Foo
from .moo import Moo

如果不执行这样的操作，不同的表将不会附加到Base上，因此在调用create_all时将不会创建这些表.

Without doing something like this the different tables will not be attached to the Base and thus will not be created when create_all is invoked.

您的initialize_db脚本随后可以通过以下方式创建所有表

Your initialize_db script can then create all of the tables via

from myapp.models.meta import Base
Base.metadata.create_all(bind=engine)

您的视图可以导入模型以获利:

Your views can import the models to profit:

from myapp.models import DBSession
from myapp.models import Foo

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