[Developers] mediated properties

[Alec Flett]

I want to add that checking by is only valid if you know you're coming 
in and out on the same property (as is the case with marriage) - if the 
properties are different, you need to look at master/reverse properties 
because you can imagine a director who also produced a movie - if you 
were just going by ids, looking at the relationship of

"Who is the /director/ of this movie /produced by/ Martin Scorsese?" - 
you might get Martin Scorsese back, but that doesn't mean that 
"director" is the reverse of "produced by".

Alec

Christopher R. Maden wrote:
> Steve Sak wrote:
>   
>> To restate the question: given a mediator object how do I determine
>> which property is the one it's mediating?  For example, type A has a
>> mediator M that has a bunch of properties mediates between A and another
>> object.  How do I determine which property of M is the one that points
>> to the other object being mediated?
>>     
>
> Mediators, or compound value types, are not especially different from 
> any other type; the UI treats them a little differently, but that’s it.
>
> But I think you are asking about instances rather than types, correct? 
> In other words, Arnold Schwarzenegger connects to a marriage, and that 
> marriage connects to two people, both Arnold Schwarzenegger and Maria 
> Shriver.  How can you tell which of the spouses is the one you started from?
>
> The only way to do that, really, is by looking at the IDs.
>
> {
>    "query": {
>      "id": null,
>      "name": "Arnold Schwarzenegger",
>      "spouse_s": [
>        {
>          "spouse": [
>            {
>              "id":null,
>              "name":null
>            }
>          ],
>          "type":"/people/marriage"
>        }
>      ],
>      "type":"/people/person"
>    }
> }
>
> {
>    "result": {
>      "spouse_s": [
>        {
>          "spouse": [
>            {
>              "id": "#9202a8c04000641f80000000001da07e",
>              "name": "Maria Shriver"
>            },
>            {
>              "id": "#9202a8c04000641f8000000000006567",
>              "name": "Arnold Schwarzenegger"
>            }
>          ],
>          "type": "/people/marriage"
>        }
>      ],
>      "type": "/people/person",
>      "id": "#9202a8c04000641f8000000000006567",
>      "name": "Arnold Schwarzenegger"
>    }
> }
>
> You can see that one of the spouses in the marriage has the same ID as 
> the person with whom you started, and that the other is different.
>
> Unfortunately, there’s not really an automatic way to say “get all of 
> the values of these properties except the ones that point back to the 
> parent within the scope of this query.”
>
> HTH,
> Chris
>   

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