Added instructor model, admin and basic actions

cntmanage/flightslot/models/instructors.py

@@ -0,0 +1,99 @@
+from django.db import models
+from django.contrib.auth.models import User, Group
+
+from phonenumber_field import modelfields
+
+from ..models.missions import MissionProfile
+from ..models.aircrafts import Aircraft
+
+class Instructor(models.Model):
+    id = models.AutoField(
+        primary_key=True
+    )
+
+    email = models.EmailField(
+        null=False,
+        db_index=True
+    )
+
+    phone = modelfields.PhoneNumberField(
+        null=True,
+        unique=True
+    )
+
+    name = models.CharField(
+        null=False,
+        blank=False,
+        max_length=32
+    )
+
+    surname = models.CharField(
+        null=False,
+        blank=False,
+        max_length=32
+    )
+
+    active = models.BooleanField(
+        null=False,
+        default=True
+    )
+
+    aircrafts = models.ManyToManyField(
+        Aircraft
+    )
+
+    missions = models.ManyToManyField(
+        MissionProfile
+    )
+
+    user = models.OneToOneField(
+        User, 
+        on_delete=models.CASCADE, 
+        null=True, 
+        blank=True
+    )
+
+    def default_password(self) -> str:  # Maximum 4 digits for passowrd
+        if self.pk:
+            return f"{self.name.lower()[0]}{self.surname.lower()}{self.id % 10000}"
+        else:
+            return ""
+
+    def default_username(self) -> str:
+        if self.pk and self.user:
+            return self.user.username
+        else:
+            return ""
+        
+    # Override save method to add user for login upon Student creation
+    def save(self, *args, **kwargs):
+        creating: bool = self.pk is None
+        super().save(*args, **kwargs)
+        if creating and not self.user:
+            username: str = f"{self.name.lower()}.{self.surname.lower()}"
+            # Avoid username conflict with progressive number
+            base_username = username
+            counter: int = 1
+            while User.objects.filter(username=username).exists():
+                username = f"{base_username}{counter}"
+                counter += 1
+            # Create user
+            user: User = User.objects.create_user(
+                first_name=self.name.capitalize(),
+                last_name=self.surname.capitalize(),
+                username=username,
+                email=self.email,
+                password=self.default_password(),
+                is_staff=True # allows access to admin page
+            )
+
+            instructor_group, _ = Group.objects.get_or_create(name="InstructorGroup")
+            user.groups.add(instructor_group)
+            self.user = user
+            self.save()
+
+    def __str__(self):
+        if self.pk:
+            return f"{self.surname} {self.name[0]}."
+        else:
+            return "New Instructor"