Django admin: How to display the field marked as “editable=False” in the model?
Use Readonly Fields. Like so (for django >= 1.2): class MyModelAdmin(admin.ModelAdmin): readonly_fields=(‘first’,)
django-models
conversion of datetime Field to string in django queryset.values_list()
https://docs.djangoproject.com/en/2.2/ref/models/fields/#datetimefield A date and time, represented in Python by a datetime.datetime instance. You can get a string representation of a DateTimeField casting it directly: str(obj) # obj = qs[0][0] ? or qs[0][1] ? You’ll get result like this (in this example I use datetime.datetime.now() since a DateTimeField is represented by datetime.datetime is the same behavior): … Read more
Django ModelForm to have a hidden input
To make a field in a ModelField a hidden field, use a HiddenInput widget. The ModelForm uses a sensible default widget for all the fields, you just need to override it when the object is constructed. class TagStatusForm(forms.ModelForm): class Meta: model = TagStatus widgets = {‘tag’: forms.HiddenInput()}
Django Migrations Add Field with Default as Function of Model
I just learned how to do this with a single migration! When running makemigrations django should ask you to set a one-off default. Define whatever you can here to keep it happy, and you’ll end up with the migration AddField you mentioned. migrations.AddField( model_name=”series”, name=”updated_as”, field=models.DateTimeField(default=????, auto_now=True), preserve_default=False, ), Change this one operation into 3 … Read more
Single Table Inheritance in Django
Summary Django’s proxy models provide the basis for Single Table Inheritance. However, some effort is required to make it work. Skip to the end for a re-usable example. Background Martin Fowler describes Single Table Inheritance (STI) as follows: Single Table Inheritance maps all fields of all classes of an inheritance structure into a single table. … Read more
How to store a dictionary on a Django Model?
If it’s really dictionary like arbitrary data you’re looking for you can probably use a two-level setup with one model that’s a container and another model that’s key-value pairs. You’d create an instance of the container, create each of the key-value instances, and associate the set of key-value instances with the container instance. Something like: … Read more
Django get_profile() method not working on extended User model
To anyone else that gets this error by following the old documentation, get_profile() has been depreciated in django 1.7. Instead you can just access the userprofile from the user as below.. u_p = user.userprofile where userprofile is the name of your UserProfile class You can also change to use the newer documentation by clicking on … Read more
Django Multiple Databases – relation does not exist; LINE 1: SELECT COUNT(*) AS “__count” FROM
Below code helped me resolve this issue python manage.py migrate –run-syncdb
Using django how can I combine two queries from separate models into one query?
I would suggest that you use Model inheritance. Create a base model that contains date and title. Subclass Msg1 and Msg2 off it as described. Do all your queries (to fill a page) using the base model and then switch to the derived type at the last moment. The really great thing about inheritance is … Read more
Django: dynamic database file
The django.db.connections is a simple wrapper around DATABASES defined in your settings. The wrapper class is here: django.db.utils#L137-L227 from django.db import connections # Add connection information dynamically.. connections.databases[‘new-alias’] = { … } # Ensure the remaining default connection information is defined. # EDIT: this is actually performed for you in the wrapper class __getitem__ # … Read more