Django Logic - easy way to implement state-based business logic
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
from django_logic import Process, Transition class ApprovalProcess(Process): transitions = [ Transition(action_name='approve', sources=['draft'], target='approved'), Transition(action_name='void', sources=['draft', 'approved'], target='void'), ]
Drawing a process with the following elements:
- Process - a transparent rectangle
- Transition - a grey rectangle
- State - a transparent ellipse
- Process' conditions and permissions are defined inside of related process as a transparent diamond
- Transition' conditions and permissions are defined inside of related transition's process as a grey diamond
- Personnel involved: User and Staff
- Lock has to be available before any actions taken. It's defined by a condition
- User is able to lock and unlock an available locker.
- Staff is able to lock, unlock and put a locker under maintenance if such was planned.
Drawing such diagram requires installing graphviz.
pip install graphviz
Run this command
from django_logic.display import * from demo.process import LockerProcess display_process(LockerProcess, state='open', skip_main_process=True)
Bind the process with a model
from django.db import models from demo.process import LockerProcess from django_logic.process import ProcessManager class Lock(ProcessManager.bind_state_fields(status=LockerProcess), models.Model): status = models.CharField(choices=LockerProcess.states, default=LockerProcess.states.open, max_length=16, blank=True)
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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