#23940: Disallow/warn on fields named exact -------------------------------------+------------------------------------- Reporter: zhiyajun11 | Owner: nicwest Type: New feature | Status: assigned Component: Database layer | Version: master (models, ORM) | Severity: Normal | Resolution: Keywords: | Triage Stage: Ready for | checkin Has patch: 1 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 1 | UI/UX: 0 -------------------------------------+-------------------------------------
Comment (by MarkusH): I was thinking about a more general solution that takes all registered lookups and transforms into account. {{{ MarkusH | wouldn't it make more sense to raise errors if fields, transforms and/or lookups clash? collinanderson | MarkusH: no idea. i haven't messed around with custom lookups MarkusH | jarshwah_: if you are around ---^ collinanderson | MarkusH: right, i was thinking that, but it's only an issue for primary_key fields, right? collinanderson | MarkusH: or any field referenced by a foreignkey MarkusH | I think it's a general problem MarkusH | any field you can possibly reference via relations MarkusH | if you have a standalone model, no FK pointing to or from, you should be safe MarkusH | collinanderson: so, what do I do with the issue now? Do I set its triage state back to accepted after I dumped my thoughts there? collinanderson | MarkusH: hah. i'm totally not a triager-expert. collinanderson | MarkusH: but let's say you have book with fk->author collinanderson | MarkusH: ohh, i get it. yeah MarkusH | ok collinanderson | MarkusH: ohh, see, you could do either book_author_id__gte=2 collinanderson | MarkusH: or book__author__id__gte=2 collinanderson | MarkusH: both of those would work with a field on author named "gte" collinanderson | right? MarkusH | yes collinanderson | and django doesn't really do that internally at all, but id _does_ do __exact a bunch collinanderson | right? (at least this ^^ is my assumption) MarkusH | but what about book__author__foo='bar' (where foo can be a field, transform or lookup) do? collinanderson | right, and in that case it should be a field, not a transform or lookup MarkusH | afaik, if no lookup is given, exact is assumed collinanderson | seems to me you if you wanted a transform/lookup in that case you could just do book__author__pk__foo='bar' collinanderson | or book__author_id__foo='bar' MarkusH | ahh, right MarkusH | thanks collinanderson | and maybe it's possible to change django so it allows for a field named "exact" in the same way MarkusH | hang on collinanderson | (i'm saying this all in theory, i haven't actually tried any of this :) MarkusH | the test case attached to the PR has a model with a field "exact" collinanderson | and i assume the bad news is it uses the lookup/transform instead of the field? MarkusH | ok. The PR is about preventing certain problems by not allowing them to happen MarkusH | it specializes the exact lookup MarkusH | it isn't about a way to find another way to access a field MarkusH | so, in practice, every lookup and transform should prevent a field of that name }}} -- Ticket URL: <https://code.djangoproject.com/ticket/23940#comment:13> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/068.e30e068171c84d4a9d4071b2aaacaf82%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.