Update team invite message (#4085)

### What problem does this PR solve?

Refactor inviting team member message.

### Type of change

- [x] Refactoring

Signed-off-by: jinhai <[email protected]>

api/apps/tenant_app.py

@@ -55,28 +55,30 @@ def create(tenant_id):
             code=settings.RetCode.AUTHENTICATION_ERROR)
 
     req = request.json
-    usrs = UserService.query(email=req["email"])
-    if not usrs:
+    invite_user_email = req["email"]
+    invite_users = UserService.query(email=invite_user_email)
+    if not invite_users:
         return get_data_error_result(message="User not found.")
 
-    user_id = usrs[0].id
-    user_tenants = UserTenantService.query(user_id=user_id, tenant_id=tenant_id)
+    user_id_to_invite = invite_users[0].id
+    user_tenants = UserTenantService.query(user_id=user_id_to_invite, tenant_id=tenant_id)
     if user_tenants:
-        if user_tenants[0].role == UserTenantRole.NORMAL:
-            return get_data_error_result(message="This user is in the team already.")
-        if user_tenants[0].role == UserTenantRole.OWNER:
-            return get_data_error_result(message="This user is the owner of the team.")
-        return get_data_error_result(message="Invitation notification is sent.")
+        user_tenant_role = user_tenants[0].role
+        if user_tenant_role == UserTenantRole.NORMAL:
+            return get_data_error_result(message=f"{invite_user_email} is already in the team.")
+        if user_tenant_role == UserTenantRole.OWNER:
+            return get_data_error_result(message=f"{invite_user_email} is the owner of the team.")
+        return get_data_error_result(message=f"{invite_user_email} is in the team, but the role: {user_tenant_role} is invalid.")
 
     UserTenantService.save(
         id=get_uuid(),
-        user_id=user_id,
+        user_id=user_id_to_invite,
         tenant_id=tenant_id,
         invited_by=current_user.id,
         role=UserTenantRole.INVITE,
         status=StatusEnum.VALID.value)
 
-    usr = usrs[0].to_dict()
+    usr = invite_users[0].to_dict()
     usr = {k: v for k, v in usr.items() if k in ["id", "avatar", "email", "nickname"]}
 
     return get_json_result(data=usr)