#29445: Compute defaults values with using of objects manager
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Reporter: Yurii | Owner: nobody
Shtrikker |
Type: New | Status: new
feature |
Component: | Version: 2.0
contrib.admin | Keywords: compute, defaults,
Severity: Normal | fields, admin site, form
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 1 |
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Background:
I have an issue for add a field used for ordering records to few models .
Problem is pre-defined value, that should calculate as currently max value
plus ten. For example:
Add first record. Field should be a 10 by default.
Add second record. Field should be a 20 by default.
Add third record. Field should be a 30 by default, but we change it to 15
for placing between first two records.
Add fourth record. Field should be a 30 by default.
For implement this logic I need access to class object when default method
is called (I mean method specifying as value for default argument for
field).
But at method call I don't get any arguments. In case when I need
implement this field for single model - I can use model name as his
objects argument for this logic. But for many models I thinks it's will be
bad. Abstract model also not a choice, because it doesn't have a objects
manager.
So I remember about prepopulated fields in BaseModelAdmin (this all need
inly for admin site), and I use formfield_for_dbfield for implementing
this logic.
Now I want to ask about add new feature to add compute_defaults dict to
BaseModelAdmin. Key used as field name selector and value as computing
function (information about model and current field we can get from
db_field variable). I can create PL with this feature by myself, but
should I do it? Is it need to somebody else? And what you all thinking
about this idea?
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Ticket URL: <https://code.djangoproject.com/ticket/29445>
Django <https://code.djangoproject.com/>
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