old_contents: from django.db import models
  from apps.user_app.models import UserProfile
  
  class Task(models.Model):
  	"""Tasks are units of work measured in terms of
  	   pomororos."""
  	WORKSHEETS = (
  			('0', 'none'),
  			('1', 'inventory'),
  			('2', 'todo'))
  	title = models.CharField(max_length=100)
  	num_pomodoros = models.IntegerField()
  	worksheet = models.CharField(max_length=100, choices=WORKSHEETS)
  	user = models.ForeignKey(UserProfile)
  
  
new_contents: from django.db import models
  from apps.user_app.models import UserProfile
  
  class Task(models.Model):
  	"""Tasks are units of work measured in terms of
  	   pomororos."""
  	title = models.CharField(max_length=100)
  	pomodoros = models.IntegerField()
  	worksheet = models.CharField(max_length=50)
  	user = models.ForeignKey(UserProfile)
  
  
subject: Remove worksheet tuple from models.py