#32759: Use dataclasses to represent models
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Reporter: adsharma | Owner: nobody
Type: New | Status: new
feature |
Component: Database | Version: 3.2
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Django documentation and current practice are described in this example:
https://docs.djangoproject.com/en/3.2/intro/tutorial02/#creating-models
This has a number of limitations:
* Python's type checkers don't understand models.CharField and
models.DateTimeField
* They do understand python strings and datetime objects
* There is some activity on typing-sig about teaching them more about
lengths and limits
dataclasses introduced in 3.7 are seeing some adoption.
The same example can be represented as:
https://github.com/adsharma/fquery/pull/2
This is more ergonomic for python programmers trained on dataclasses.
Queries against these dataclasses can be expressed in one of two ways:
* A method chaining API such as:
https://github.com/adsharma/fquery/blob/main/tests/test_operators.py
* SQL via ActiveRecord or DataMapper
https://github.com/adsharma/dataclasses-
sql/blob/master/tests/test_decorators.py
For this to work as well as current django models, two things need to
happen:
* How to pass additional metadata about database schema? (dataclasses
support metadata, perhaps make it more ergonomic?)
* What to do about indices, views and other db concepts
One school of thought is to use SQL DDL.
Some conversation on this topic here:
https://twitter.com/arundsharma/status/1390898932713066499
Would love to hear more from the django community on the topic.
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Ticket URL: <https://code.djangoproject.com/ticket/32759>
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