Core data updating
The batch request is composed of an entity (the entity containing the property or properties you want to update) and a predicate to define a subset of data you want to update.
If one member is doing work in the background (for example, getting updates from a Bluetooth peripheral or performing network activity) then this can cause a problem if another member is also running.
This is what you should have now: Now we’re going to add some entities to our data model to be able to test our update listener.
Go ahead and select the property is to enable and disable the logging of updates to the console. The Property Names part defines the default values for the properties.
If you have one bit of state in your attributes that might require such a batch update, then a possible alternative approach is using "a higher order of that state," so you just change it in one place.
Taking Brent Simmons' case as an example, says Marcus, that would mean, instead of setting the "read" flag for each feed entry, store a date somewhere so you know you are going to ignore all entries older than that.
