[Tickets #10880] Re: Rdo: Make *- to-one-relations aware of "no relation" state

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Ticket URL: http://bugs.horde.org/ticket/10880
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  Ticket             | 10880
  Updated By         | Ralf Lang (B1 Systems GmbH) <lang at b1-systems.de>
  Summary            | Rdo: Make *- to-one-relations aware of "no relation"
                     | state
  Queue              | Horde Framework Packages
  Version            | Git master
  Type               | Enhancement
  State              | New
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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Ralf Lang (B1 Systems GmbH) <lang at b1-systems.de> (2011-12-22 19:14) wrote:

> Rdo currently doesn't understand the concept of a missing relation.
> I'd suggest to either return no object or an exception.
> Consistence with to-many-relations is hard.
> These relations always return a list object, possibly an empty one.
> As to-one-relations are often used in chains (at least in my code)  
> I'd prefer a clean exception over an empty result but the current  
> situation is worst for me.

When there is a value in the ID field (0, 33, "somekey" as opposed to  
'' or NULL), but the referenced object is no longer there, I get an  
empty result rather than a wrong object or an exception. Trying to  
blindly execute code on this not-an-object results in a crash.

Changing this too would be clearly BC breaking.