django-models

问题 In my app, i have a dropdown (department) that's depending on the previously selected value from a dropdown(faculty field). I am using ajax to get the new value which works fine. However, when i try saving the form, i get Select a valid choice. That choice is not one of the available choices. Here is my model from django.db import models from system.models import FacultyData, DepartmentData, SessionData, SemesterData, SettingsData # Create your models here. class SchoolFees(models.Model): fid

问题 In my app, i have a dropdown (department) that's depending on the previously selected value from a dropdown(faculty field). I am using ajax to get the new value which works fine. However, when i try saving the form, i get Select a valid choice. That choice is not one of the available choices. Here is my model from django.db import models from system.models import FacultyData, DepartmentData, SessionData, SemesterData, SettingsData # Create your models here. class SchoolFees(models.Model): fid

问题 We're migrating and making necessary changes to our Oracle database, one major change is that we're adding an UUIDField as primary_key to all models(hidden to the client), and(trying to add) a regular AutoField . We found that displaying the primary_key directly to our clients wasn't good design, but they also requested an ID field displayed to reference objects more easily, but Django limits this by not allowing AutoField to NOT be the primary_key Is there a workaround for this issue? 回答1:

问题 We're migrating and making necessary changes to our Oracle database, one major change is that we're adding an UUIDField as primary_key to all models(hidden to the client), and(trying to add) a regular AutoField . We found that displaying the primary_key directly to our clients wasn't good design, but they also requested an ID field displayed to reference objects more easily, but Django limits this by not allowing AutoField to NOT be the primary_key Is there a workaround for this issue? 回答1:

问题 I have a Django class as follows: class MyModel(models.Model): my_int = models.IntegerField(null=True, blank=True,) created_ts = models.DateTimeField(default=datetime.utcnow, editable=False) When I run the following queryset, I get an error: >>> from django.db.models import Max, F, Func >>> MyModel.objects.all().aggregate(Max(Func(F('created_ts'), function='UNIX_TIMESTAMP'))) Traceback (most recent call last): File "<console>", line 1, in <module> File "MyVirtualEnv/lib/python2.7/site

问题 I'm fairly new to django and Python and want to be able to export a list of items in my model i.e products. I'm looking at the documentation here - https://docs.djangoproject.com/en/dev/howto/outputting-csv/ I'm persuming I need will need to create a variable that stores all the data that I want. But not sure where it would within the snippet of code on the link above. Apologies as this is a very noobish question but would really Any help at all. Here is the code to my script so far: import

问题 I'm fairly new to django and Python and want to be able to export a list of items in my model i.e products. I'm looking at the documentation here - https://docs.djangoproject.com/en/dev/howto/outputting-csv/ I'm persuming I need will need to create a variable that stores all the data that I want. But not sure where it would within the snippet of code on the link above. Apologies as this is a very noobish question but would really Any help at all. Here is the code to my script so far: import

问题 I'm fairly new to django and Python and want to be able to export a list of items in my model i.e products. I'm looking at the documentation here - https://docs.djangoproject.com/en/dev/howto/outputting-csv/ I'm persuming I need will need to create a variable that stores all the data that I want. But not sure where it would within the snippet of code on the link above. Apologies as this is a very noobish question but would really Any help at all. Here is the code to my script so far: import

问题 I'm fairly new to django and Python and want to be able to export a list of items in my model i.e products. I'm looking at the documentation here - https://docs.djangoproject.com/en/dev/howto/outputting-csv/ I'm persuming I need will need to create a variable that stores all the data that I want. But not sure where it would within the snippet of code on the link above. Apologies as this is a very noobish question but would really Any help at all. Here is the code to my script so far: import

问题 I'm fairly new to django and Python and want to be able to export a list of items in my model i.e products. I'm looking at the documentation here - https://docs.djangoproject.com/en/dev/howto/outputting-csv/ I'm persuming I need will need to create a variable that stores all the data that I want. But not sure where it would within the snippet of code on the link above. Apologies as this is a very noobish question but would really Any help at all. Here is the code to my script so far: import