Search results
4 paź 2012 · Try using a defaultdict. from collections import defaultdict users = defaultdict (list) for result in UserExtendedProfile.objects.values ('company', 'user').order_by ('company', 'user'): users [result ['company']].append (result ['user']) With this you should get on users the structure you want.
31 gru 2013 · question = models.ForeignKey(Question) ... The goal is to group answers by questions. I could think of some ways of spanning the model relatioship from the Question side - retrieve all the questions which have any answers: Question.objects.annotate(answer_count = Count('answer')) \ .filter(answer_count__gte=1)
1 kwi 2024 · Django provides a powerful tool called Generic Foreign Keys for establishing relationships between models with a polymorphic nature. This article delves into this concept, exploring the...
6 paź 2024 · Note that you must save an object before it can be assigned to a foreign key relationship. For example, creating an Article with unsaved Reporter raises ValueError : >>> r3 = Reporter ( first_name = "John" , last_name = "Smith" , email = "john@example.com" ) >>> Article . objects . create ( ...
8 lis 2023 · In Django-ORM, use the Foreign keys if you want to map Many to One relationship, for example, an agent to handle many projects in a table. Foreign keys are also used as referenced keys with an integer used to map a specific task a user performs in the database.
26 gru 2023 · Learn how to perform Django ORM foreign key queries with this comprehensive guide. Includes examples of how to use foreign keys to query for related objects, update data in related objects, and delete related objects.
27 lip 2024 · In this example, models.Q(pk__gt=0) creates a Q object that filters out any authors with a primary key (pk) of 0. This is crucial because Django automatically assigns 0 as the PK when creating a new object before saving it.
