Select

public struct Select<D, T> : SelectClause, Hashable where D : DynamicObject, T : SelectResultType

The Select clause indicates the attribute / aggregate value to be queried. The generic type is a SelectResultType, and will be used as the return type for the query.

You can bind the return type by specializing the initializer:

let maximumAge = CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select<Int>(.maximum("age"))
)

or by casting the type of the return value:

let maximumAge: Int = CoreStore.queryValue(
    From<MyPersonEntity>(),
    Select(.maximum("age"))
)

Valid return types depend on the query:

for queryValue(...) methods:
- all types that conform to QueryableAttributeType protocol
for queryAttributes(...) methods:
- NSDictionary


                    
                    
                    init(_:_:)

Initializes a Select clause with a list of SelectTerms

Declaration

Swift

public init(_ selectTerm: SelectTerm<D>, _ selectTerms: SelectTerm<D>...)

Parameters

`selectTerm`	a `SelectTerm`
`selectTerms`	a series of `SelectTerm`s


                    
                    
                    init(_:)

Initializes a Select clause with a list of SelectTerms

Declaration

Swift

public init(_ selectTerms: [SelectTerm<D>])

Parameters


                                selectTerms

a series of SelectTerms

Equatable


                    
                    
                    ==(_:_:)

Declaration

Swift

public static func == <T, U>(lhs: Select<D, T>, rhs: Select<D, U>) -> Bool where T : SelectResultType, U : SelectResultType

SelectClause

ObjectType
Declaration
Swift

public typealias ObjectType = D
ReturnType
Declaration
Swift

public typealias ReturnType = T
selectTerms
Declaration
Swift

public let selectTerms: [SelectTerm<D>]

Hashable


                    
                    
                    hash(into:)

Declaration

Swift

public func hash(into hasher: inout Hasher)

CustomDebugStringConvertible


                    
                    
                    debugDescription

Declaration

Swift

public var debugDescription: String { get }

Select

init()
Initializes a Select that queries for NSManagedObjectID results
Declaration
Swift

public init()

Select


                    
                    
                    init(_:)

Initializes a Select that queries the value of an attribute pertained by a keyPath

Declaration

Swift

public init(_ keyPath: KeyPath<D, T>)

Parameters


                                keyPath

the keyPath for the attribute

Select


                    
                    
                    init(_:)

Initializes a Select that queries the value of an attribute pertained by a keyPath

Declaration

Swift

public init(_ keyPath: KeyPath<D, ValueContainer<D>.Required<T>>)

Parameters


                                keyPath

the keyPath for the attribute


                    
                    
                    init(_:)

Initializes a Select that queries the value of an attribute pertained by a keyPath

Declaration

Swift

public init(_ keyPath: KeyPath<D, ValueContainer<D>.Optional<T>>)

Parameters


                                keyPath

the keyPath for the attribute

Select


                    
                    
                    init(_:)

Initializes a Select that queries the value of an attribute pertained by a keyPath

Declaration

Swift

public init(_ keyPath: KeyPath<D, TransformableContainer<D>.Required<T>>)

Parameters


                                keyPath

the keyPath for the attribute


                    
                    
                    init(_:)

Initializes a Select that queries the value of an attribute pertained by a keyPath

Declaration

Swift

public init(_ keyPath: KeyPath<D, TransformableContainer<D>.Optional<T>>)

Parameters


                                keyPath

the keyPath for the attribute