Automatically search all fields for all models in django admin - django

Question

I want to be able to search all models for all fields in Django admin, without having to setup ModelAdmin and searchfields individually.
example:
I have all my models in model.py:
# This is an auto-generated Django model module.
from django.db import models
class Diagnosis(models.Model):
id = models.BigAutoField(primary_key=True)
code = models.CharField(max_length=255)
starting_node = models.ForeignKey('Node', models.DO_NOTHING, blank=True, null=True)
class Meta:
managed = False
db_table = 'diagnosis'
def __str__(self):
return 'Diag #' + str(self.id) + ' - ' + self.code
class DiagnosisHistory(models.Model):
id = models.IntegerField(primary_key=True)
title = models.CharField(max_length=255, blank=True, null=True)
date = models.DateTimeField(blank=True, null=True)
id_user = models.TextField(blank=True, null=True)
report = models.TextField(blank=True, null=True)
json_report = models.TextField(blank=True, null=True)
vin = models.CharField(max_length=20, blank=True, null=True)
class Meta:
managed = False
db_table = 'diagnosis_history'
# and so on
and the admin.py where I register the models:
from django.contrib import admin
from . import models
# Do not care. Register everything
for cls in [cls for name, cls in models.__dict__.items() if isinstance(cls, type)]:
admin.site.register(cls)
I don't want to run through each Model and manually create a ModelAdmin with each field

Answer 1

This is the solution I came up with:
from django.contrib import admin
from django.db import models as django_models
from . import models
relationship_fields = (django_models.ManyToManyField, django_models.ForeignKey, django_models.OneToOneField)
for cls in [cls for name, cls in models.__dict__.items() if isinstance(cls, type)]:
meta_fields = [field.name for field in cls._meta.local_fields if not isinstance(field, relationship_fields)]
class Admin(admin.ModelAdmin):
search_fields = meta_fields
admin.site.register(cls, Admin)
Note: registering all fields will fail since some are relationships. using cls._meta.local_fields exclude inferred relationships but you also need to exclude fields such as foreign keys defined in your model. Thus, we filter with isinstance(field, relationship_fields)
Note 2: I should probably use get_fields since local_fields seems to be private API (see https://docs.djangoproject.com/en/3.1/ref/models/meta/)

Answer 2

class MyModelAdmin(admin.ModelAdmin):
# ...
search_fields = [field.name for field in MyModel._meta.fields]
# ...