init

web/models.py

@@ -0,0 +1,39 @@
+from django.core.exceptions import ValidationError
+from django.db import models
+
+
+class User(models.Model):
+  name = models.TextField()
+  email = models.TextField()
+
+  def __str__(self):
+    return f'{self.name}'
+
+
+class Activity(models.Model):
+  type = models.TextField()
+
+  def __str__(self):
+    return f'{self.type}'
+
+
+class ActivityLog(models.Model):
+  user = models.ForeignKey(User, on_delete=models.CASCADE)
+  activity = models.ForeignKey(Activity, on_delete=models.CASCADE)
+
+  start_time = models.DateTimeField()
+  end_time = models.DateTimeField()
+  logged_at = models.DateTimeField(auto_now_add=True)
+
+  def clean(self):
+    if self.start_time >= self.end_time:
+      raise ValidationError(f'Illegal times: {self}')
+
+    for other_activity in ActivityLog.objects.filter(user=self.user).exclude(id=self.id):
+      l = max(self.start_time, other_activity.start_time)
+      r = min(self.end_time, other_activity.end_time)
+      if r > l:
+        raise ValidationError(f'Intersects with another activity: \n{self}\n{other_activity}\n{l}, {r}')
+
+  def __str__(self):
+    return f'ActivityLog[{self.user}, {self.activity}] {self.start_time}-{self.end_time} ({self.end_time - self.start_time})'