Opened 6 years ago
Last modified 6 years ago
#29911 closed New feature
Standardize delete_cached_value API on model Fields — at Initial Version
| Reported by: | Taylor H | Owned by: | nobody |
|---|---|---|---|
| Component: | Database layer (models, ORM) | Version: | 2.1 |
| Severity: | Normal | Keywords: | |
| Cc: | Triage Stage: | Unreviewed | |
| Has patch: | no | Needs documentation: | no |
| Needs tests: | no | Patch needs improvement: | no |
| Easy pickings: | no | UI/UX: | no |
Description
I created a custom Django model field that is expensive to calculate and I store a cached value on the model. I am not able to clear the cache when some uses the refresh_from_db() method though, since there is no standard API to hook into it. It appears that there is a custom behavior for ForeignKey that calls the delete_cached_value function, if it detects it's a ForeignKey
https://github.com/django/django/blob/master/django/db/models/base.py#L569
It would be great to allow any custom Field to implement delete_cached_value and have it called inside refresh_from_db. What are your thoughts? I would be happy to submit a PR if this seems reasonable
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