ValueReducer
public protocol ValueReducer
The ValueReducer protocol supports ValueObservation.
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The type of fetched database values
Declaration
Swift
associatedtype Fetched
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The type of observed values
Declaration
Swift
associatedtype Value
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Feches database values upon changes in an observed database region.
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Transforms a fetched value into an eventual observed value. Returns nil when observer should not be notified.
This method runs inside a private dispatch queue.