Django- Get Foreign Key Model
How can I Get A Foreign Key Model Type?
class Category(models.Model): name = models.CharField(max_length = 100) class SubCategory(models.Model): category = models.ForeignKey(Category) title = models.CharField(max_length = 100)
I Want To Get category Model In SubCategory.
How Can I Do It?
subcategory = SubCategory.objects.get(pk=given_pk) subcategory.category
Many-to-one relationships | Django documentation, The “other side” of a ForeignKey relation. That is: ForeignKey(Reporter, on_delete=models. b = Blog.objects.get(id=1) >>> e = Entry.objects.get(id=234) Django- Get Foreign Key Model. Ask Question Asked 8 years, 2 months ago. Django: Get list of model fields? 2. Show information of subclass in list_display django. 2.
ReverseSingleRelatedObjectDescriptor objects. So that's what you are really working with. You'll get that if you run
type(SubCategory.category). From here you can use two ways to get the actual Class/Model referred to.
SubCategory.category.field.rel.to # <class 'path.to.Model'> SubCategory.category.field.rel.to.__name__ # 'Category' # or these will do the same thing SubCategory._meta.get_field('category').rel.to SubCategory._meta.get_field('category').rel.to.__name__
If you don't know the attribute name until run-time, then use
getattr(SubCategory, attributeNameVariable) to get your
ReverseSingleRelatedObjectDescriptor object for that ForeignKey field.
Related objects reference | Django documentation, Updating a ForeignKey field works exactly the same way as saving a normal field from blog.models import Blog, Entry >>> entry = Entry.objects.get(pk=1) >>> cheese_blog For each model field that has choices set, Django will add a method to retrieve the human-readable name for the field’s current value. See get_FOO_display () in the database API documentation. Note that choices can be any sequence object – not necessarily a list or tuple. This lets you construct choices dynamically. But if you find yourself
>>> SubCategory._meta.get_field('category').remote_field.model >>> 'my_app.models.Category'
To get the model name use the
__name__ class property.
>>> SubCategory._meta.get_field('category').remote_field.model.__name__ >>> 'Category'
Making queries | Django documentation, You can specify a related_name for the company foreign key on your Interview model like so. class Company(models.Model): name = models. Django 3.0 documentation. Using Django. Models and databases. Examples of model relationship API usage. Many-to-one relationships; Getting help FAQ Try the FAQ — it's got answers to many common questions. Index, Module Index, or Table of Contents Handy when looking for specific information. django-users mailing list
also for django > = 2.0
>>> SubCategory._meta.get_field('category').related_model >>> <class 'my_app.models.Category'> >>> SubCategory._meta.get_field('category').related_model._meta.model_name >>> 'category'
Cleanest way to get list of Django objects that have same foreign , select_related(scope) - Returns a QuerySet that will “follow” foreign-key relationships, from django.utils import timezone # Find all the blogs with entries scheduled to be published in the from django.db import models class City(models. Your intermediate model must contain one - and only one - foreign key to the source model (this would be Group in our example), or you must explicitly specify the foreign keys Django should use for the relationship using ManyToManyField.through_fields.
select_related - django - Python documentation, Accessing Foreign Key Values¶. When you access a field that's a ForeignKey , you'll get the related model object. For example:. Using settings we pass the AUTH_USER_MODEL as a string into our model. Option 3: get_user_model. A third way to access the user model is via get_user_model. Up until the release of Django 1.11, get_user_model was not called at import time--meaning it would not always work correctly--however that has since been changed. It is therefore safe to use.
Chapter 10: Advanced Models, ORM Cookbook · Books »; Django ORM Cookbook »; 4. How to order on a field from a related model (with a foreign key)?; email@example.com (with a foreign key)?¶. You have two models, Category and Hero . SELECT "entities_hero". 5. Operate On Model Class Foreign Key Field. From above Employee model class definition, we see that it has a foreign key type field, and the foreign key model class is django.contrib.auth.models.User. We can manage the foreign key field as below. 5.1 Retrieve Employee Foreign Key Field Information.
4. How to order on a field from a related model (with a foreign key , #Some utilities to work with django models and foreign keys. #Especially useful for finding (and writing out) code to illuminate information about relations. #. Django 3.0 documentation. Using Django. Models and databases. Examples of model relationship API usage. One-to-one relationships; Getting help FAQ Try the FAQ — it's got answers to many common questions. Index, Module Index, or Table of Contents Handy when looking for specific information. django-users mailing list