Add url property to all container types and container_url to all contained types

inventory/models/area.py

@@ -1,3 +1,4 @@
+from django.urls import reverse
 from django.db import models
 from .container import Container, CanBeContained
 
@@ -7,3 +8,7 @@ class Area(CanBeContained, Container):
     description = models.CharField(max_length=4096)
     created_at = models.DateTimeField(auto_now_add=True)
     changed_at = models.DateTimeField(auto_now=True)
+
+    @property
+    def url(self):
+        return reverse("area-detail", args=[self.pk])

inventory/models/box.py

@@ -1,3 +1,4 @@
+from django.urls import reverse
 from django.utils.text import slugify
 from django.template.loader import get_template, TemplateDoesNotExist
 from django.db import models
@@ -24,3 +25,7 @@ class Box(CanBeContained, Container):
             return template
         except TemplateDoesNotExist:
             return 'inventory/box-generic.html'
+
+    @property
+    def url(self):
+        return reverse("box-detail", args=[self.pk])

inventory/models/container.py

@@ -1,3 +1,4 @@
+from django.urls import reverse
 from django.db import models
 from django.apps import apps
 
@@ -5,7 +6,8 @@ from django.apps import apps
 class Container(models.Model):
     layout = models.ForeignKey('inventory.Layout', on_delete=models.PROTECT, null=True, blank=True)
 
-    def _subclass(self):
+    @property
+    def subclass(self):
         for model in apps.get_app_config('inventory').get_models():
             if model == Container:
                 continue
@@ -16,16 +18,20 @@ class Container(models.Model):
         return Container, None
 
     def __str__(self):
-        subclass, obj = self._subclass()
+        subclass, obj = self.subclass
         return '{}: {}'.format(subclass.__name__, obj.name)
 
     @property
     def display_name(self):
-        _, obj = self._subclass()
+        _, obj = self.subclass
         if obj is not None:
             return obj.name
         return 'Container'
 
+    @property
+    def url(self):
+        return None
+
 
 class CanBeContained(models.Model):
     container = models.ForeignKey(
@@ -38,3 +44,8 @@ class CanBeContained(models.Model):
 
     class Meta:
         abstract = True
+
+    @property
+    def container_url(self):
+        _, obj = self.container.subclass
+        return obj.url

inventory/models/workshop.py

@@ -1,3 +1,4 @@
+from django.urls import reverse
 from django.db import models
 from .container import Container
 
@@ -7,3 +8,7 @@ class Workshop(Container):
     description = models.CharField(max_length=4096)
     created_at = models.DateTimeField(auto_now_add=True)
     changed_at = models.DateTimeField(auto_now=True)
+
+    @property
+    def url(self):
+        return reverse("workshop-detail", args=[self.pk])