Let's see if I understand your proposal correctly: Workflow and Step act as
template and are used to define the structure of different workflows.
Project and Task 'implement' the template and are used as for actual work
flows. So I formulate things that are fixed using the template and for the
rest I use Project and Task models.
I adapted your code a bit: For each Step one can specify an assignee and a
deadline that act as suggestions for the same data of the task model. So
when a task is created, it is at first filled using the information in the
Step model. In addition I added some more information to the Project.
from django.db import models
from django.contrib.auth.models import User
class Workflow(models.Model):
name = models.charfield(max_length = 200)
description = models.TextField()
class Step(models.Model):
workflow = models.ForeignKeyField(Workflow)
name = models.charfield()
order = models.SmallIntegerField()
taskdescription = models.TextField()
# suggestions for deadline / assignee
deadline = # implement as number of days from project.start_date or as
number of days from start of current step. How?
assigned_to = models.ForeignKeyField(User, blank=True, null=True)
class Project(models.Model):
name = models.charfield()
workflow = models.ForeignKeyField(Workflow)
creation_date = models.DatetimeField(auto_now_add = True)
creator = models.ForeignKeyField(User)
start_date = models.DatetimeField() # in case start of project differs
from creation date, default: creation date
class Task(models.Model):
project = models.ForeignKeyField(Project)
step = models.ForeignKeyField(Step)
deadline = models.DatetimeField() # initially computed from
project.start_date, may be postponed by the user
assigned_to = models.ForeignKeyField(User, blank=True, null=True) #
initially as given by Step, may be changed later
start = models.DatetimeField(blank=True, null=True)
finish = models.DatetimeField(blank=True, null=True)
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