I was looking through the code and I saw that the onMutateBlock seems to only ever be set in a CBLJSONEncoding object is when the CBLModel is loading its contents from a CBLDocument. But what about the first time the CBLJSONEncoding object is created and assigned to a CBLModel? Let's say the model is saved, program is still running, user makes changes to the CBLJSONEncoding child object - how does one notify the parent CBLModel that it needs to be saved since the onMutateBlock was never set?
Thanks for all your help! Cheers, Ragu On Thursday, April 10, 2014 7:01:01 AM UTC-7, Jens Alfke wrote: > > > On Apr 10, 2014, at 6:37 AM, Ragu Vijaykumar <[email protected]<javascript:>> > wrote: > > Does this mean that if my object implementing CBLJSONEncoding is at all > mutable, I need this class? And if so, does it mean that anytime I change > any of its instance variables / properties, I need to call the onMutate > block? > > > Yes. The parent model object needs to know when its in-memory state has > changed, so that it can set its needsSave flag. Otherwise it won’t get > saved back to the document it came from. Normally it can do that easily by > just noticing when any of its property setters are called. But if a > property value is a custom class implementing CBLJSONEncoding, then that > value might itself be mutable and the model can’t tell when it changes. > > So what your class should do is implement that method and store the > onMutate block in an instance variable, then call that block right after > its persistent state changes. That will notify the model, which will set > its own needsSave flag. > > If the above answers are yes, is there any clean way I can just observe > changes to all my properties and automatically call this block, perhaps as > a generic superclass to any nested child classes of a CBLModel? > > > Interesting idea. I think that would work. You might even be able to use > the Obj-C runtime’s reflection APIs to automatically discover all of the > class’s mutable properties and iterate over them. Let us know if you come > up with something. > > —Jens > -- You received this message because you are subscribed to the Google Groups "Couchbase Mobile" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/mobile-couchbase/976d81d4-2edf-4d3b-b12e-292056a4236a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
