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Django Logic - easy way to implement state-based business logic

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Django Logic is a lightweight workflow framework aims to solve an open problem "Where to put the business logic in Django?".

Full documentation for the project is available at wiki

The Django-Logic package provides a set of tools helping to build a reliable product within a limited time. Here is the functionality the package offers for you:

  • Implement state-based business processes combined into Processes.
  • Provides a business logic layer as a set of conditions, side-effects, permissions, and even celery-tasks combined into a transition class.
  • In progress states
  • REST API actions - every transition could be turned into a POST request action within seconds by extending your ViewSet and Serialiser of Django-Rest-Framework
  • Background transitions via django-logic-celery.
  • Draw your business processes to get a full picture of all transitions and conditions.
  • Easy to read the business process
  • One and only one way to implement business logic. You will be able to extend and improve the Django-Logic functionality and available handlers. However, the business logic will remain the same and by following SOLID principles.
  • Test your business logic by unit-tests as pure functions.
  • Protects from overwritten states, locks, etc. already implemented in Django Logic and you could control the behaviour.
  • Several states can be combined under the same Model.


Use the package manager pip to install Django-Logic.

pip install django-logic


  1. Create a django project and start a new app
  2. Create a new file under the app and define your process.
from django_logic import Process as BaseProcess, Transition

class Process(BaseProcess):
    states = (
        ('draft', 'Draft'),
        ('paid', 'Paid'),
        ('void', 'Void'),

    transitions = [
        Transition(action_name='approve', sources=['draft'], target='approved'),
        Transition(action_name='void', sources=['draft', 'approved'], target='void'),
  1. Display the process. It requires to install graphviz.
pip install graphviz

  1. Bind the process with a model
from django.db import models
from django_logic.process import ProcessManager
from .process import Process as InvoiceProcess

class Invoice(ProcessManager.bind_state_fields(status=InvoiceProcess), models.Model):
    status = models.CharField(choices=InvoiceProcess.states, default='draft', max_length=16, blank=True)
  1. Usage
invoice = Invoice.objects.create()
print(list([transition.action_name for transition in invoice.process.get_available_transitions())])
>> ['approve', 'void']
>> 'approved'

print(list([transition.action_name for transition in invoice.process.get_available_transitions())])
>> ['void']
>> 'void'


Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.



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Under development

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