Viewflow

The low-code for developers with yesterday's deadline

Viewflow is a reusable component library for building business applications with ease. It's built on top of Django, making it accessible for developers with experience in these technologies. With Viewflow, you can create full-featured business applications in just a few lines of code using its reusable component library.

Like Django, Viewflow shipped as a single package with batteries included. Each part Viewflow can be used independently of each other, but they all work well together.

Viewflow comes in two flavors:

Viewflow Core: A lightweight, open-source library with only non-opinionated core classes that allows you to build your custom solution on top.
Viewflow PRO: A comprehensive package that includes reference functionality implementation and integrated with third-party Django packages. This package has a commercial-friendly license that allows private forks and modifications of Viewflow.

Features

Modern, responsive user interface with an SPA-style look and feel
Reusable workflow library for quick implementation of BPMN workflows
Built-in customizable CRUD for managing complex forms and data
Integrated reporting dashboard
Small and concise API

Installation

Viewflow works with Python 3.8 or greater and Django 4.0+

Viewflow:

pip install django-viewflow --pre

Viewflow-PRO

pip install django-viewflow-pro  --extra-index-url https://pypi.viewflow.io/<licence_id>/simple/ --pre

Quick start

Here's an example of how to create a simple pizza ordering workflow using Viewflow:

Create a model to store process data

Before creating the workflow, you'll need to define a model to store the process data. Viewflow provides a Process model as the base model for your process instances. You can add your own fields to the model using jsonstore fields to avoid model inheritance and additional joins:

    from viewflow import jsonstore
    from viewflow.workflow.models import Process

    class PizzaOrder(Process):
        customer_name = jsonstore.CharField(max_length=250)
        address = jsonstore.TextField()
        toppings = jsonstore.TextField()
        tips_received = json_Store.IntegerField(default=0)

        class Meta:
            proxy = True

Create a new flow definition file flows.py

Next, create a new flow definition file flows.py and define your workflow. In this example, we'll create a PizzaFlow class that inherits from flow.Flow. We'll define three steps in the workflow: start, bake, and deliver. We'll use CreateProcessView and UpdateProcessView to create and update the process data from PizzaOrder:

    from viewflow import this
    from viewflow.workflow import flow
    from viewflow.workflow.flow.views import CreateProcessView, UpdateProcessView

    class PizzaFlow(flow.Flow):
        process_class = PizzaOrder

        start = flow.Start(
            CreateProcessView.as_view(
                fields=["customer_name", "address", "toppings"]
            )
        ).Next(this.bake)

        bake = flow.View(
            UpdateProcessView.as_view(fields=["baking_time"])
        ).Next(this.deliver)

        deliver = flow.View(
            UpdateProcessView.as_view(fields=["tips_received"])
        ).Next(this.end)

        end = flow.End()

Add the flow to your URL configuration:

Finally, add the PizzaFlow to your URL configuration. You can use the Site and FlowAppViewset classes to register your workflow with the pre-built frontend.

    from viewflow.contrib.auth import AuthViewset
    from viewflow.urls import Application, Site
    from my_pizza.flows import PizzaFlow

    site = Site(
        title="Pizza Flow Demo",
        viewsets=[
            FlowAppViewset(PizzaFlow, icon="local_pizza"),
        ]
    )

    urlpatterns = [
        path("accounts/", AuthViewset().urls),
        path("", site.urls),
    ]

Run migrations and access the workflow through the pre-built frontend.

Run migrations to create the necessary database tables, then start your Django server and access the workflow through the pre-built frontend. You should be able to create and track pizza orders with the workflow.

Documentation

Viewflow's documentation for the latest version is available at http://docs.viewflow.io/

Documentarian for Viewflow 1.xx series available at http://v1-docs.viewflow.io

Demo

http://demo.viewflow.io/

Cookbook

For sample applications and code snippets, check out the Viewflow PRO cookbook at

https://github.com/viewflow/cookbook

License

Viewflow is an Open Source project licensed under the terms of the AGPL license - The GNU Affero General Public License v3.0 <http://www.gnu.org/licenses/agpl-3.0.html>_ with the Additional Permissions described in LICENSE_EXCEPTION <./LICENSE_EXCEPTION>_

You can read more about AGPL at AGPL FAQ <http://www.affero.org/oagf.html>_ This package license scheme follow GCC Runtime library licensing. If you use Linux already, this package license likely won't bring anything new to your stack.

Viewflow PRO has a commercial-friendly license allowing private forks and modifications of Viewflow. You can find the commercial license terms in COMM-LICENSE.