backlog/main/models.py

from django.contrib.auth.models import User
from django.db import models
from martor.models import MartorField


class BaseModel(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    objects = models.Manager()
    
    class Meta:
        abstract = True

    def model_name(self):
        return self._meta.verbose_name

class Project(BaseModel):
    class Meta:
        verbose_name = "projet"
        verbose_name_plural = "projets"
        
    name = models.CharField(max_length=200)
    description = models.TextField(default="", blank=True)
#     icon
    owner = models.ForeignKey(User, 
                               on_delete=models.PROTECT, 
                               null=True,
                               related_name="projects",
                               related_query_name="project")
    
    def __str__(self):
        return self.name
    
class Epic(BaseModel):
    class Meta:
        verbose_name = "epic"
        verbose_name_plural = "epics"
        ordering = ('-value', )
        
    SIZES = (("XXS","XXS (< 1 sprints)"), 
             ("XS", "XS (1 sprint)"), 
             ("S", "S (1-2 sprints)"), 
             ("M", "M (2-3 sprints)"), 
             ("L", "L (3-4 sprints)"), 
             ("XL", "XL (4-6 sprints)"), 
             ("XXL", "XXL  (> 6 sprints)"))
    
    name = models.CharField(max_length=200, default="")
    size = models.CharField(max_length=10, default="M", choices=SIZES)
    value = models.IntegerField(default=0)
    description = models.TextField(default="", blank=True)
    project = models.ForeignKey(Project, on_delete=models.PROTECT, null=True)
    
    def __str__(self):
        return self.name
    
class Sprint(BaseModel):
    class Meta:
        verbose_name_plural = "sprint"
        verbose_name_plural = "sprints"
        ordering = ('date_start', )
    date_start = models.DateField()
    date_end = models.DateField()
        
    def __str__(self):
        return "Sprint #{} ({:%d/%m/%Y} > {:%d/%m/%Y})".format(self.id, self.date_start, self.date_end)
    
class Story(BaseModel):
    class Meta:
        verbose_name = "story"
        verbose_name_plural = "stories"
        ordering = ('-updated', )
    epic = models.ForeignKey(Epic, on_delete=models.PROTECT, null=True)
    name = models.CharField(max_length=200, default="")
    description = MartorField()
    closed = models.BooleanField(default=False)
    author = models.ForeignKey(User, 
                               on_delete=models.PROTECT, 
                               null=True,
                               related_name="stories",
                               related_query_name="story")
    
    assignees = models.ManyToManyField(User, 
                                       related_name="assigned")
    
    sprints = models.ManyToManyField(Sprint, 
                                       related_name="stories",
                                       related_query_name="story")
    
    def __str__(self):
        return self.name