#Persistent

Persistent is a small convenience wrapper around CoreData written in Swift.

Model

The Model is an alias for the NSManagedObjectModel. It also extends the current functionality with some short and convenient methods.

// merged model from all bundles
let a = Model.all()

// merged model from main bundle
let b = Model.main()

// merged model from multiple models
let c = Model(m1, m2, m3)

Stack

The Stack class provides a simple interface to create a simple Core Data Stack with only a few lines of code. A newly created Stack automatically creates a Coordinator -> NSPersistentStoreCoordinator and a Context -> NSManagedObjectContext for access on the main thread.

Instantiation

A Stack will by default initialize with a merged Model from all Bundles but can be initialized with an optional Model.

let stack = Stack()

let model = Model.main()
let stack = Stack(model:model)

Only a Store is missing to make it fully functional.

Store

The Store is kind of an abstract representation for a NSPersistentStore.

DAO

Query, Comparison, Compound

A Query is just an alias for NSPredicate. Same goes for Comparison -> NSComparisonPredicate and Compound -> NSCompoundPredicate.

Operator extensions

NSPredicate already provided a stright forward implementation to create queries and by leveraging operator overloading in swift it is eaven more simple.

let old = NSPredicate(format:"name == %@", "Jenny")
let new:Query = "name" == "Jenny"

let old = NSPredicate(format:"name == %@ && ALL age >= %@", "John", 21)
let new:Query = "name" == "John" && ALL("age" >= 21)