how to set relation in object without updating related object?

General
1

I have table “Inventory” with column QtyType - 1to1 relation to table QuantityType. Rows in QuantityType table shouldn’t be updated by anyone, only used as reference.
In QuantityType permisssions I set ‘deny’ to update to authenticated user. All rows in QuantityType created by User A.
I have row, created with user B, in Inventory table that I would like to update - set relation QtyType to certain object. In console REST console, logged as user B,
I execute PUT for Inventory objectId yyyyy in Inventory with body

{
"QtyType": {
    "___class": "QuantityType",
    "objectId": "xxxxxxxxxx"
    }
}

When Inventory object updated I also see that QuantityType referenced object is updated too. That’s confusing, I don’t understand why it’s updated at all? Also why it’s updated whereas I denied that access (and if I try update this QuantityType object directly I’m receiving expected “User has no permission to update entity” error)

2
  1. “Also why it’s updated whereas I denied that access…”
    This issue was already discussed here:
    “Unfortunately, this is the expected behaviour for now - we don’t yet support checking permissions for related entity. Though it may be fixed in the future, we can’t provide any exact time frame.”
    http://support.backendless.com/t/permissions-dont-seem-working
  2. To avoid updating related data object try to load only parent object (without related child)
    and update only it.
3
  1. Thanks, yes, I got it
  2. I don’t understand what do you mean by loading parent object - I’m trying to create new object (and set it’s related field to certain existing object).
4

When you save an object with related entities, all entities are marked as saved. So you can’t relate one object to another without implicitly updating both of them.

5

Interesting. So, I can do it in console (I mean without related object update) - create object, then click on “+” and set related object, but not in API?

6

Yes, because the only way to set a relation using API is to send the objects in the request, and the server always marks the objects as updated if it receives them in such request.