#33680: Documentation example of customising model instance loading has a bug
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Reporter: Ali-Toosi | Owner: nobody
Type: Bug | Status: new
Component: | Version: 4.0
Documentation | Keywords: documentation,
Severity: Normal | from_db, model instance loading
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
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The docs provide an example of how the model instance loading can be
changed and how `_loaded_values` can be saved for future comparison here:
https://docs.djangoproject.com/en/4.0/ref/models/instances/
In this example, it checks if there are any values not loaded from db then
add them as DEFERRED values so class instantiation would work
(`cls(*values)`). However, this would mean `values` list has items now
that do not map to any `field_names` so when at the end of the function,
we zip them together and store in `_loaded_values`, the code will fail.
The easiest fix for this is to update the `field_names` too so they would
1. work and 2. show which fields were not loaded from the db at the time.
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Ticket URL: <https://code.djangoproject.com/ticket/33680>
Django <https://code.djangoproject.com/>
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