Add comments app with models, views, and tests; integrate comments into existing models

companies/models.py

@@ -2,6 +2,7 @@ from django.db import models
 from django.utils.text import slugify
 from django.urls import reverse
 from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes.fields import GenericRelation
 from typing import Tuple, Optional, ClassVar, TYPE_CHECKING
 from history_tracking.models import HistoricalModel, VersionBranch, ChangeSet
 from history_tracking.signals import get_current_branch, ChangesetContextManager
@@ -19,6 +20,10 @@ class Company(HistoricalModel):
     total_rides = models.IntegerField(default=0)
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
+    comments = GenericRelation('comments.CommentThread',
+        related_name='company_threads',
+        related_query_name='comments_thread'
+    )
 
     objects: ClassVar[models.Manager['Company']]
 
@@ -101,6 +106,10 @@ class Manufacturer(HistoricalModel):
     total_roller_coasters = models.IntegerField(default=0)
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
+    comments = GenericRelation('comments.CommentThread',
+        related_name='manufacturer_threads',
+        related_query_name='comments_thread'
+    )
 
     objects: ClassVar[models.Manager['Manufacturer']]
 
@@ -181,6 +190,10 @@ class Designer(HistoricalModel):
     total_roller_coasters = models.IntegerField(default=0)
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
+    comments = GenericRelation('comments.CommentThread',
+        related_name='designer_threads',
+        related_query_name='comments_thread'
+    )
 
     objects: ClassVar[models.Manager['Designer']]