- Initial commit after converting project to SQLAlchemy and Pyramid
- I'm not happy about this but ultimately django's lack of support for
- custom database schemas had caused too serious problems for it to be
- worth the effort. Django is clearly not made to be able to comfortably
- interact with a mildly complicated preexisting relational database.
- Django's ORM is little more than an object persistence layer that looks
- at the relational database backend as an implementation detail.
- Composite primary keys are plain not supported at all. Certain structure
- is expected and anything else is badly supported. Many-to-many
- relationships that are not implemented like the ORM expects are hard. Each
- object represents exactly one row in one table and it is not supported to
- deviate from that. These and many other issues have cost a lot of time and
- It was my conclusion that django's ORM had to be replaced with SQLAlchemy.
- Much of django, including:
- *the authentication framework
- *flatpages and the other "batteries included"
- *the admin interface
- *most reusable apps
- are tightly coupled to the django ORM and thus we would lose those if we
- tried to replace it with SQLAlchemy. Additionally, there is little
- published experience on using django with SQLAlchemy so that option
- might be full of surprises.
- Django's admin interface also proved too inflexible for the data, most
- notably due to inlines not being nestable and inlines are required for
- basic things like a (normalized, thus using a table for itself) list of
- names inside a model.
- Thus facing inability to use almost all of django's good features and
- having to convert the whole project anyway, I decided to leave django
- out of it for good. I picked pyramid to fill it's place due to it being
- perhaps the biggest and best supported project to use with SQLAlchemy
- and having roots in repoze and Zope, it is well structured for the kind
- of flowing organization data where the data is more important than the
- The new template system is jinja2 which is basically a better designed
- almost-compatable version of django's templating system and most our
- templates work with minimal modifications and the cost of that part of
- the conversion is practically zero. Dispatch was also chosen instead of
- traversal even though traversal might suit this project better due to
- dispatch being almost a drop-in replacement for django's url
- configuration and traversal requiring major architectural changes.
- reused to prevent having to rewrite it. As features are added and
- designs change, it is expected to be phased out. Form generation is now
- handled by the formalchemy library.
- Overall time lost to the conversion is about 3-4 days, which is less
- than the time lost already to fighting django.
First commit message after dropping django for pyramid
a guest Jul 18th, 2011 3,250 Never
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