#101 Team sharing form

* adds team sharing field to share form
* splits sharing logic into user based and teams based
* adds TeamAdmin for admin backend
* adds validity check on Team name -> only unused names shall be valid

user/admin.py

@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from user.models import UserNotification, UserActionLogEntry, User
+from user.models import UserNotification, UserActionLogEntry, User, Team
 
 
 class UserNotificationAdmin(admin.ModelAdmin):
@@ -64,7 +64,20 @@ class UserActionLogEntryAdmin(admin.ModelAdmin):
     ]
 
 
+class TeamAdmin(admin.ModelAdmin):
+    list_display = [
+        "name",
+        "description",
+        "admin",
+    ]
+    search_fields = [
+        "name",
+        "description",
+    ]
+
+
 admin.site.register(User, UserAdmin)
+admin.site.register(Team, TeamAdmin)
 
 # Outcommented for a cleaner admin backend on production
 #admin.site.register(UserNotification, UserNotificationAdmin)

user/forms.py

@@ -206,6 +206,25 @@ class NewTeamModalForm(BaseModalForm):
         self.action_url = reverse("user:team-new")
         self.cancel_redirect = reverse("user:team-index")
 
+    def _is_name_valid(self):
+        name = self.cleaned_data.get("name", None)
+        teams_with_same_name = Team.objects.filter(
+            name=name
+        )
+        name_valid = not teams_with_same_name.exists()
+        if not name_valid:
+            self.add_error(
+                "name",
+                _("Name already taken. Try another.")
+            )
+
+        return name_valid
+
+    def is_valid(self):
+        super_valid = super().is_valid()
+        name_valid = self._is_name_valid()
+        return super_valid and name_valid
+
     def save(self):
         with transaction.atomic():
             team = Team.objects.create(
@@ -246,6 +265,22 @@ class EditTeamModalForm(NewTeamModalForm):
 
         return _is_valid
 
+    def _is_name_valid(self):
+        name = self.cleaned_data.get("name", None)
+        teams_with_same_name = Team.objects.filter(
+            name=name
+        ).exclude(
+            id=self.instance.id
+        )
+        name_valid = not teams_with_same_name.exists()
+        if not name_valid:
+            self.add_error(
+                "name",
+                _("Name already taken. Try another.")
+            )
+
+        return name_valid
+
     def is_valid(self):
         super_valid = super().is_valid()
         admin_valid = self.__is_admin_valid()