Added failing test case for #17.

positions/examples/school/models.py

@@ -0,0 +1,24 @@
+from django.db import models
+
+from positions import PositionField
+
+
+class SubUnit(models.Model):
+    name = models.CharField(max_length=100)
+
+
+class Task(models.Model):
+    """
+    Base class for lessons/exercises - ordered items within a sub-unit
+    """
+    sub_unit = models.ForeignKey(SubUnit)
+    position = PositionField(collection='sub_unit')
+
+
+class Lesson(Task):
+    subject = models.CharField(max_length=100)
+    text = models.TextField(blank=True)
+
+
+class Exercise(Task):
+    description = models.CharField(max_length=100)

positions/examples/school/tests.py

@@ -0,0 +1,25 @@
+from django.db import models
+
+from positions.examples.school.models import SubUnit, Lesson, Exercise
+
+
+tests = """
+
+>>> american_revolution = SubUnit.objects.create(name="American Revolution")
+
+>>> no_taxation = Lesson.objects.create(sub_unit=american_revolution, subject="No Taxation without Representation")
+>>> no_taxation.position
+0
+
+>>> research_paper = Exercise.objects.create(sub_unit=american_revolution, description="Two pages, double spaced")
+>>> research_paper.position
+1
+
+>>> tea_party = Lesson.objects.create(sub_unit=american_revolution, subject="Boston Tea Party")
+>>> tea_party.position
+2
+
+"""
+
+
+__test__ = {'tests': tests}

positions/examples/settings.py

@@ -14,4 +14,5 @@
     'positions.examples.todo',
     'positions.examples.store',
     'positions.examples.photos',
+    'positions.examples.school',
 )