How to Solve ‘django.core.exceptions.FieldDoesNotExist’ ?
Method 1: Fix misspelled / incorrect field names
For instance, consider a scenario where you have defined a ‘Product’ model, but you are trying to access an object using a non-existing field name. This will trigger the ‘FieldDoesNotExist‘ error. By using the available field names as defined in your model, you can resolve this error.
Python3
from django.db import modelsclass Product(models.Model): id = models.AutoField(primary_key=True) # It should be AutoField, not AutoField. name = models.CharField(max_length=100) price = models.IntegerField()# Getting the product by using a non-existing field# will lead to a field does not exist error.# You should use 'filter' with the existing field 'price'.obj = Product.objects.filter(price=1000) |
Method 2: Missing/ Removal Field
If you are trying to access a field that no longer exists in the model’s schema, you have a couple of options. In this case, you can either refer to another field that does exist in the model’s schema, or you can add the missing field and then migrate the model.
To add the field you want to the model’s schema, follow these steps:
- Open your Django model file.
- Add the desired field to the model definition.
- Save the changes to the model file.
Python3
from django.db import modelsclass Car(models.Model): name = models.CharField() price = models.IntegerField() category = models.CharField() # newly added field |
Next, you’ll need to run the following commands to migrate the changes:
python manage.py makemigrations
python manage.py migrate
Pending Migrations
If you have done any changes to model schema and you are trying to access the new field But getting this error. it may happen that the migrations you applied is not reflected in your database.
for this reasons you can try this 2 steps first for applying the migrations properly. Second for clearing the caches because cached data may not reflect the recent changes to the model.
- Apply pending migrations
- Step 1 – Delete initial migration file from the migrations folder present in your directory.
- Step 2 – Migrate it again using the command “Python manage.py makemigrations app_name” replace app_name with your installed app.
- Step 3 – Verify another migration file has been created in Migrations folder.
- Clear Cache
- Step 1 – Install django-clearcache package in your project environment.
- Step 2 – After successfull installation add it into installed apps in settings.py file.
- Step 3 – Add a url in your project base directory.
- Step 4 – Now you can use “Python manage.py clearcache” command to clear the cache.
- Step 5 – Restart the server.
Sync Database Schema
If you are experiencing this error in the development environment then this command you can try to reset the database. This will reset the database.
Python manage.py flush
click "YES"
How to fix ‘django.core.exceptions.FieldDoesNotExist’
In this article we will explore how we can fix / solve the django.core.exceptions.FieldDoesNotExist’ error This exception raised by Django indicates that the field we are trying to access or modify is not exist. There may be some typo mistakes, field may not be there. So in this article we are looking for the solutions to fix this error.