Django find all related objects
Webdef recursive_delete (to_del): """Recursively delete an object, all of its protected related instances, those instances' protected instances, and so on. """ from django.db.models import ProtectedError while True: try: to_del_pk = to_del.pk if to_del_pk is None: return # unsaved object to_del.delete () print (f"Deleted {to_del.__class__.__name__} … WebDjango hits database everytime you try to access related model data. m = models.DigitalApplicationsAndPlatform.objects.filter (id=1).select_related ('digital_area').prefetch_related ('keywords').values ('digital_product', 'digital_area__digital_area', 'keywords__keyword') You have use below hints to tackle it …
Django find all related objects
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Web21 hours ago · queryset = Record.objects.all() When I query Solr, using Django-Haystack, I can get a list of Info objects pk's that match the query string: sqset = SearchQuerySet().filter(text=query_string).values_list('pk', flat=True) sqset can be 500+ items in length. So when I attempt to use it in a standard query using __in in Django, I … WebDjango: Get all objects and the first record of a related model. cameras = Camera.objects.all () return render (request, 'myapp/cameras.html', {'content': cameras}) But I now need to also include the latest record of CameraLog for each Camera that is called in the statement above. CameraLog has a foreign key for the Camera it's associated with.
Web20 hours ago · Im building a Django model for creating Polls with various users where they can invite each other. class Participant (models.Model): user = models.ForeignKey (settings.AUTH_USER_MODEL,on_delete=models.CASCADE) class DateTimeRange (models.Model): start_time = models.DateTimeField () end_time = … WebAug 29, 2011 · First, you'll need to clear the relationship (s) by using .clear () or .remove (), whichever suits your needs better according to the docs. After that, you'll need to delete the object (s) by using the [YourModel]. delete () method. for m2m fields .remove () will delete the relationship using QuerySet.delete ().
WebYou give it a mark out of 5 (stars). The models are defined like this. def Property (models.Model) # stuff here def Rating (models.Model) property = models.ForeignKey (Property) stars = models.IntegerField () What I want to do is get a property, find all the Rating objects, collect them, then get the average 'stars' from them. WebSep 22, 2024 · You can get the id via resp.uid_id (this makes the misnaming obvious). Anyway, resps = userresp.objects.filter (uid_id=3) will work. If you have the User instance, use the related_name of the fk field, e.g.: user = get_user_model ().objects.get (id=3) resps = user.userresp_set.all () Share Improve this answer Follow answered Sep 22, 2024 at …
WebNov 3, 2011 · 1 Answer Sorted by: 16 related_name is the name for referring to it from the target-model (User in this case). The way you have set it you should be calling: u = User.objects.get (pk=1) u.owner.all () However for clarity you probably should set the related name to something like related_name='video_set' (which is default name for it btw).
WebAug 1, 2010 · Many.objects.filter(one=one).update(one=None) I think that Django deletes related object on program level (without on delete cascade in DBMS). So probably your objects are in some kind of cache and Django still thinks that they are related to one object. Try to list the related objects before you delete. print one.many_set one.delete() black diamond ring with black bandWebAug 6, 2024 · It’s fine if the aggregate function is hardcoded I.e. Parent.objects.all().annotate_min_ngc_per_c(), but please explain as best you can do I can reproduce with multiple aggregates. django; django-models; Share. ... Django count related objects with condition. 3. Find sibling records that have differences in M2M … game bar featuresWeb20 hours ago · Running Coroutines Concurrently. Now, we have all steps covered by coroutine functions and we can gather them together in an asynchronous view new_contributor (): # forms.py from django import forms class NewContributorForm(forms.Form): email = forms.EmailField(required=True, label="Email … black diamond ring womenWebJul 10, 2014 · Django has something called Collector class. It is used by Django when performing a model deletion. What it does seems like exactly what you want. By calling collect () it finds all the references to the object in the model graph. Additionally it offers a way to delete all the found objects, with a delete () call. blackdiamond rmbWebMay 30, 2009 · @sunprophit You need to re-read my response more carefully. Yes, of course you can do self.child_object() using the real_type field (that is in the code above as the cast() method), and that will take only one query for one instance. But if you have a queryset full of instances, that becomes N queries. black diamond ring set weddingWebFeb 20, 2024 · You may want to change that related name from associatedOrgs to be associatedorgs to follow more closely to the django coding style. Documentation on this has a few examples. healthcare_category = Category.objects.get (pk="healthcare") organizations = healthcare_category.associatedorgs.all () Share Improve this answer … black diamond rise tightsgame bar greyed out