Get all related model class in django

Question

I am trying to get a list of all related model class instance that have a Foreign Key relationship, so that I can do something like model._meta.fields..

Here is what I have so far:

for related_object in A._meta.get_all_related_objects():
        related_name = related_object.field.rel.related_name

but I am not sure how to get related model class..

Thanks for your help!

score 3 · Answer 1 · answered Oct 11 '15 at 14:46

In the last Django version (1.8), the options object has a property named related_objects; it will return an iterable with all the foreign relations definitions to the model in place. Each such relation can be inspected for properties:

for relation in A._meta.related_objects:
    print(relation.related_model)    # model which has foreign keys to A
    print(relation.field.name)       # name of the foreign key field

The iterable related_objects represents the "reverse" relations (ManyToOneRel, ManyToManyRel) to the A model.

If it's not obvious, is driven by the field definitions rather then the model definitions, meaning that a related model will have as many entries as ForeingKey fields to the A model it has.

score 2 · Answer 2 · answered Mar 25 '22 at 02:29

2

This is working in Django version 3.2. You can check it for other versions.

for t in A._meta._relation_tree:
    print(t.model)

answered Mar 25 '22 at 02:29

Indika Rajapaksha

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This works.. Great... Can you help me on how to get related objects per each model given an instance of A – Dante Apr 17 '23 at 22:00
@Dante ask your question in a separate thread or you can search if it already asked by someone else. – Indika Rajapaksha Apr 18 '23 at 11:12

score 1 · Accepted Answer · edited May 23 '17 at 11:44

1

You can use .model to get the class name

for related_object in A._meta.get_all_related_objects():
    print related_object.model

Maybe this question/answers could be useful for you as well.

edited May 23 '17 at 11:44

Community

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answered Aug 05 '14 at 15:24

trinchet

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The question was about "get all related model class". This solution returns the instances. Imagine that the tables are empty. This would return no instance. But the related classes exist. – guettli Jun 10 '15 at 07:26
Previous comment is confusing. This returns a class, but it returns the wrong class, since `model` will return the current class, whereas `related_model` returns what was asked for (the related model, obviously). – AlanSE Oct 16 '17 at 18:33

Get all related model class in django

3 Answers3