create unique slugs for services (#5837)

hobo/environment/forms.py

@@ -37,7 +37,17 @@ class BaseForm(forms.ModelForm):
 
     def save(self, commit=True):
         if not self.instance.slug:
-            self.instance.slug = slugify(self.instance.title)
+            base_slug = slugify(self.instance.title)
+            slug = base_slug
+            i = 1
+            while True:
+                try:
+                    self.Meta.model.objects.get(slug=slug)
+                except self.Meta.model.DoesNotExist:
+                    break
+                i += 1
+                slug = '%s-%s' % (base_slug, i)
+            self.instance.slug = slug
         if not self.instance.secret_key:
             self.instance.secret_key = get_random_string(50, SECRET_CHARS)
         choices = self.get_template_choices()