feat(itim): New Model SLMTicketBase

ref: #724 #727

app/itim/models/__init__.py

@@ -0,0 +1 @@
+from . import slm_ticket_base

app/itim/models/slm_ticket_base.py

@@ -0,0 +1,73 @@
+from django.db import models
+
+from core.models.ticket_base import TicketBase
+
+
+
+class SLMTicket(
+    TicketBase
+):
+    """Ticket Type
+
+    Base Ticket Type for tickets that require Servie Level Management.
+    """
+
+
+    class Meta:
+
+        ordering = [
+            'id',
+        ]
+
+        verbose_name = 'SLM Ticket Base'
+
+        verbose_name_plural = 'SLM Tickets'
+
+
+
+    @property
+    def get_ticket_type(self):
+        """Fetch the Ticket Type
+
+        Returns:
+            str: The models `Meta.verbose_name` in lowercase and without spaces
+            None: The ticket is for the Base class (TicketBase). Used to prevent creating a base ticket.
+            None: The ticket is for the Base class (SLMTicket). Used to prevent creating a base ticket.
+        """
+
+        ticket_type = super().get_ticket_type
+
+        if(
+            ticket_type is None
+            or ticket_type == 'slmticket'
+        ):
+
+            return None
+
+        return ticket_type
+
+
+    # SLA = models.ForeignKey(
+    #     ServiceLevelAgreement,
+    #     blank = True,
+    #     help_text = 'Service Level Agreement this ticket is covered under',
+    #     null = True,
+    #     on_delete = models.PROTECT,
+    #     verbose_name = 'SLA',
+    # )
+
+    ttr = models.IntegerField(
+        blank = True,
+        default = 0,
+        help_text = 'Time taken to resolve the ticket / Time to Resolution (TTR)',
+        null = False,
+        verbose_name = 'TTR',
+    )    # Set when ticket is closed and always update to the latest close date
+
+    tto = models.IntegerField(
+        blank = True,
+        default = 0,
+        help_text = 'Time taken to Acknowledge ticket / Time to Ownership (TTO)',
+        null = False,
+        verbose_name = 'TTO',
+    )    # set to the time when the ticket is first assigned. DONT update ever.