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In Django, every model has a pseudo attribute pk, that points to the field that is declared as primary key.
class TestModel(models.Model): payload = models.Charfield(max_length=200) In this model, the pk attribute would point to the implicit id field, that is generated if no field is declared to be the primary.
class CustomPK(models.Model) primary = models.CharField(max_length=100, primary=True) payload = models.Charfield(max_length=200) In this model, the pk attribute would point to the explicit defined primary key field primary
So my question is, how can I get the name of the field, that is the primary key?
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The __str__() method is called whenever you call str() on an object. Django uses str(obj) in a number of places. Most notably, to display an object in the Django admin site and as the value inserted into a template when it displays an object.
Python | Relational fields in Django models. Django model data types and fields list. TextField – Django Models. DateTimeField – Django Models. DateTimeField – Django Forms.
If you'd like to specify a custom primary key, specify primary_key=True on one of your fields. If Django sees you've explicitly set Field.primary_key , it won't add the automatic id column. Each model requires exactly one field to have primary_key=True (either explicitly declared or automatically added).
You will also have an attribute "name" on the pk-attribute. This seems to hold the name of the Field.
CustomPK._meta.pk.name In my case I get the value "id" as result (like it should). :-)
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Field objects have a primary_key attribute
for field in CustomPK._meta.fields: print field.primary_key print field.name # True # primary # False # payload If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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