mirror of
https://github.com/JohnEstropia/CoreStore.git
synced 2026-03-22 01:19:42 +01:00
792 lines
22 KiB
Swift
792 lines
22 KiB
Swift
//
|
|
// Select.swift
|
|
// CoreStore
|
|
//
|
|
// Copyright © 2015 John Rommel Estropia
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
//
|
|
|
|
import Foundation
|
|
import CoreData
|
|
|
|
|
|
// MARK: - SelectResultType
|
|
|
|
/**
|
|
The `SelectResultType` protocol is implemented by return types supported by the `Select` clause.
|
|
*/
|
|
public protocol SelectResultType {}
|
|
|
|
|
|
// MARK: - SelectValueResultType
|
|
|
|
/**
|
|
The `SelectValueResultType` protocol is implemented by return types supported by the `queryValue(...)` methods.
|
|
*/
|
|
public protocol SelectValueResultType: SelectResultType {
|
|
|
|
static var attributeType: NSAttributeType { get }
|
|
|
|
static func fromResultObject(result: AnyObject) -> Self?
|
|
}
|
|
|
|
|
|
// MARK: - SelectAttributesResultType
|
|
|
|
/**
|
|
The `SelectValueResultType` protocol is implemented by return types supported by the `queryAttributes(...)` methods.
|
|
*/
|
|
public protocol SelectAttributesResultType: SelectResultType {
|
|
|
|
static func fromResultObjects(result: [AnyObject]) -> [[NSString: AnyObject]]
|
|
}
|
|
|
|
|
|
// MARK: - SelectTerm
|
|
|
|
/**
|
|
The `SelectTerm` is passed to the `Select` clause to indicate the attributes/aggregate keys to be queried.
|
|
*/
|
|
public enum SelectTerm: StringLiteralConvertible, Hashable {
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying an entity attribute. A shorter way to do the same is to assign from the string keypath directly:
|
|
```
|
|
let fullName = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<String>(.Attribute("fullName")),
|
|
Where("employeeID", isEqualTo: 1111)
|
|
)
|
|
```
|
|
is equivalent to:
|
|
```
|
|
let fullName = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<String>("fullName"),
|
|
Where("employeeID", isEqualTo: 1111)
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- returns: a `SelectTerm` to a `Select` clause for querying an entity attribute
|
|
*/
|
|
public static func Attribute(keyPath: KeyPath) -> SelectTerm {
|
|
|
|
return ._Attribute(keyPath)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying the average value of an attribute.
|
|
```
|
|
let averageAge = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<Int>(.Average("age"))
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "average(<attributeName>)" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for querying the average value of an attribute
|
|
*/
|
|
public static func Average(keyPath: KeyPath, As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Aggregate(
|
|
function: "average:",
|
|
keyPath: keyPath,
|
|
alias: alias ?? "average(\(keyPath))",
|
|
nativeType: .DecimalAttributeType
|
|
)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for a count query.
|
|
```
|
|
let numberOfEmployees = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<Int>(.Count("employeeID"))
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "count(<attributeName>)" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for a count query
|
|
*/
|
|
public static func Count(keyPath: KeyPath, As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Aggregate(
|
|
function: "count:",
|
|
keyPath: keyPath,
|
|
alias: alias ?? "count(\(keyPath))",
|
|
nativeType: .Integer64AttributeType
|
|
)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying the maximum value for an attribute.
|
|
```
|
|
let maximumAge = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<Int>(.Maximum("age"))
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "max(<attributeName>)" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for querying the maximum value for an attribute
|
|
*/
|
|
public static func Maximum(keyPath: KeyPath, As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Aggregate(
|
|
function: "max:",
|
|
keyPath: keyPath,
|
|
alias: alias ?? "max(\(keyPath))",
|
|
nativeType: .UndefinedAttributeType
|
|
)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying the minimum value for an attribute.
|
|
```
|
|
let minimumAge = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<Int>(.Minimum("age"))
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "min(<attributeName>)" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for querying the minimum value for an attribute
|
|
*/
|
|
public static func Minimum(keyPath: KeyPath, As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Aggregate(
|
|
function: "min:",
|
|
keyPath: keyPath,
|
|
alias: alias ?? "min(\(keyPath))",
|
|
nativeType: .UndefinedAttributeType
|
|
)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying the sum value for an attribute.
|
|
```
|
|
let totalAge = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<Int>(.Sum("age"))
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "sum(<attributeName>)" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for querying the sum value for an attribute
|
|
*/
|
|
public static func Sum(keyPath: KeyPath, As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Aggregate(
|
|
function: "sum:",
|
|
keyPath: keyPath,
|
|
alias: alias ?? "sum(\(keyPath))",
|
|
nativeType: .DecimalAttributeType
|
|
)
|
|
}
|
|
|
|
/**
|
|
Provides a `SelectTerm` to a `Select` clause for querying the `NSManagedObjectID`.
|
|
```
|
|
let objectID = CoreStore.queryValue(
|
|
From(MyPersonEntity),
|
|
Select<NSManagedObjectID>(),
|
|
Where("employeeID", isEqualTo: 1111)
|
|
)
|
|
```
|
|
|
|
- parameter keyPath: the attribute name
|
|
- parameter alias: the dictionary key to use to access the result. Ignored when the query return value is not an `NSDictionary`. If `nil`, the default key "objecID" is used
|
|
- returns: a `SelectTerm` to a `Select` clause for querying the sum value for an attribute
|
|
*/
|
|
public static func ObjectID(As alias: KeyPath? = nil) -> SelectTerm {
|
|
|
|
return ._Identity(
|
|
alias: alias ?? "objectID",
|
|
nativeType: .ObjectIDAttributeType
|
|
)
|
|
}
|
|
|
|
|
|
// MARK: StringLiteralConvertible
|
|
|
|
public init(stringLiteral value: KeyPath) {
|
|
|
|
self = ._Attribute(value)
|
|
}
|
|
|
|
public init(unicodeScalarLiteral value: KeyPath) {
|
|
|
|
self = ._Attribute(value)
|
|
}
|
|
|
|
public init(extendedGraphemeClusterLiteral value: KeyPath) {
|
|
|
|
self = ._Attribute(value)
|
|
}
|
|
|
|
|
|
// MARK: Hashable
|
|
|
|
public var hashValue: Int {
|
|
|
|
switch self {
|
|
|
|
case ._Attribute(let keyPath):
|
|
return 0 ^ keyPath.hashValue
|
|
|
|
case ._Aggregate(let function, let keyPath, let alias, let nativeType):
|
|
return 1 ^ function.hashValue ^ keyPath.hashValue ^ alias.hashValue ^ nativeType.hashValue
|
|
|
|
case ._Identity(let alias, let nativeType):
|
|
return 3 ^ alias.hashValue ^ nativeType.hashValue
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: Internal
|
|
|
|
case _Attribute(KeyPath)
|
|
case _Aggregate(function: String, keyPath: KeyPath, alias: String, nativeType: NSAttributeType)
|
|
case _Identity(alias: String, nativeType: NSAttributeType)
|
|
}
|
|
|
|
|
|
// MARK: - SelectTerm: Equatable
|
|
|
|
@warn_unused_result
|
|
public func == (lhs: SelectTerm, rhs: SelectTerm) -> Bool {
|
|
|
|
switch (lhs, rhs) {
|
|
|
|
case (._Attribute(let keyPath1), ._Attribute(let keyPath2)):
|
|
return keyPath1 == keyPath2
|
|
|
|
case (._Aggregate(let function1, let keyPath1, let alias1, let nativeType1),
|
|
._Aggregate(let function2, let keyPath2, let alias2, let nativeType2)):
|
|
return function1 == function2
|
|
&& keyPath1 == keyPath2
|
|
&& alias1 == alias2
|
|
&& nativeType1 == nativeType2
|
|
|
|
case (._Identity(let alias1, let nativeType1), ._Identity(let alias2, let nativeType2)):
|
|
return alias1 == alias2 && nativeType1 == nativeType2
|
|
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Select
|
|
|
|
/**
|
|
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:
|
|
- `Bool`
|
|
- `Int8`
|
|
- `Int16`
|
|
- `Int32`
|
|
- `Int64`
|
|
- `Double`
|
|
- `Float`
|
|
- `String`
|
|
- `NSNumber`
|
|
- `NSString`
|
|
- `NSDecimalNumber`
|
|
- `NSDate`
|
|
- `NSData`
|
|
- `NSManagedObjectID`
|
|
- `NSString`
|
|
- for `queryAttributes(...)` methods:
|
|
- `NSDictionary`
|
|
|
|
- parameter sortDescriptors: a series of `NSSortDescriptor`s
|
|
*/
|
|
public struct Select<T: SelectResultType>: Hashable {
|
|
|
|
/**
|
|
The `SelectResultType` type for the query's return value
|
|
*/
|
|
public typealias ReturnType = T
|
|
|
|
/**
|
|
Initializes a `Select` clause with a list of `SelectTerm`s
|
|
|
|
- parameter selectTerm: a `SelectTerm`
|
|
- parameter selectTerms: a series of `SelectTerm`s
|
|
*/
|
|
public init(_ selectTerm: SelectTerm, _ selectTerms: SelectTerm...) {
|
|
|
|
self.selectTerms = [selectTerm] + selectTerms
|
|
}
|
|
|
|
/**
|
|
Initializes a `Select` clause with a list of `SelectTerm`s
|
|
|
|
- parameter selectTerms: a series of `SelectTerm`s
|
|
*/
|
|
public init(_ selectTerms: [SelectTerm]) {
|
|
|
|
self.selectTerms = selectTerms
|
|
}
|
|
|
|
|
|
// MARK: Hashable
|
|
|
|
public var hashValue: Int {
|
|
|
|
return self.selectTerms.map { $0.hashValue }.reduce(0, combine: ^)
|
|
}
|
|
|
|
|
|
// MARK: Internal
|
|
|
|
internal let selectTerms: [SelectTerm]
|
|
}
|
|
|
|
public extension Select where T: NSManagedObjectID {
|
|
|
|
public init() {
|
|
|
|
self.init(.ObjectID())
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Select: Equatable
|
|
|
|
@warn_unused_result
|
|
public func == <T: SelectResultType, U: SelectResultType>(lhs: Select<T>, rhs: Select<U>) -> Bool {
|
|
|
|
return lhs.selectTerms == rhs.selectTerms
|
|
}
|
|
|
|
|
|
// MARK: - Bool: SelectValueResultType
|
|
|
|
extension Bool: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .BooleanAttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Bool? {
|
|
|
|
return (result as? NSNumber)?.boolValue
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Int8: SelectValueResultType
|
|
|
|
extension Int8: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Int8? {
|
|
|
|
guard let value = (result as? NSNumber)?.longLongValue else {
|
|
|
|
return nil
|
|
}
|
|
return numericCast(value) as Int8
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Int16: SelectValueResultType
|
|
|
|
extension Int16: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Int16? {
|
|
|
|
guard let value = (result as? NSNumber)?.longLongValue else {
|
|
|
|
return nil
|
|
}
|
|
return numericCast(value) as Int16
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Int32: SelectValueResultType
|
|
|
|
extension Int32: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Int32? {
|
|
|
|
guard let value = (result as? NSNumber)?.longLongValue else {
|
|
|
|
return nil
|
|
}
|
|
return numericCast(value) as Int32
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Int64: SelectValueResultType
|
|
|
|
extension Int64: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Int64? {
|
|
|
|
return (result as? NSNumber)?.longLongValue
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Int: SelectValueResultType
|
|
|
|
extension Int: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Int? {
|
|
|
|
guard let value = (result as? NSNumber)?.longLongValue else {
|
|
|
|
return nil
|
|
}
|
|
return numericCast(value) as Int
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Double : SelectValueResultType
|
|
|
|
extension Double: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .DoubleAttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Double? {
|
|
|
|
return (result as? NSNumber)?.doubleValue
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Float: SelectValueResultType
|
|
|
|
extension Float: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .FloatAttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> Float? {
|
|
|
|
return (result as? NSNumber)?.floatValue
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - String: SelectValueResultType
|
|
|
|
extension String: SelectValueResultType {
|
|
|
|
public static var attributeType: NSAttributeType {
|
|
|
|
return .StringAttributeType
|
|
}
|
|
|
|
public static func fromResultObject(result: AnyObject) -> String? {
|
|
|
|
return result as? NSString as? String
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSNumber: SelectValueResultType
|
|
|
|
extension NSNumber: SelectValueResultType {
|
|
|
|
public class var attributeType: NSAttributeType {
|
|
|
|
return .Integer64AttributeType
|
|
}
|
|
|
|
public class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSNumber>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSString: SelectValueResultType
|
|
|
|
extension NSString: SelectValueResultType {
|
|
|
|
public class var attributeType: NSAttributeType {
|
|
|
|
return .StringAttributeType
|
|
}
|
|
|
|
public class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSString>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSDecimalNumber: SelectValueResultType
|
|
|
|
extension NSDecimalNumber {
|
|
|
|
public override class var attributeType: NSAttributeType {
|
|
|
|
return .DecimalAttributeType
|
|
}
|
|
|
|
public override class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSDecimalNumber>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSDate: SelectValueResultType
|
|
|
|
extension NSDate: SelectValueResultType {
|
|
|
|
public class var attributeType: NSAttributeType {
|
|
|
|
return .DateAttributeType
|
|
}
|
|
|
|
public class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSDate>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSData: SelectValueResultType
|
|
|
|
extension NSData: SelectValueResultType {
|
|
|
|
public class var attributeType: NSAttributeType {
|
|
|
|
return .BinaryDataAttributeType
|
|
}
|
|
|
|
public class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSData>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSManagedObjectID: SelectValueResultType
|
|
|
|
extension NSManagedObjectID: SelectValueResultType {
|
|
|
|
public class var attributeType: NSAttributeType {
|
|
|
|
return .ObjectIDAttributeType
|
|
}
|
|
|
|
public class func fromResultObject(result: AnyObject) -> Self? {
|
|
|
|
func forceCast<T: NSManagedObjectID>(object: AnyObject) -> T? {
|
|
|
|
return (object as? T)
|
|
}
|
|
return forceCast(result)
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - NSManagedObjectID: SelectAttributesResultType
|
|
|
|
extension NSDictionary: SelectAttributesResultType {
|
|
|
|
// MARK: SelectAttributesResultType
|
|
|
|
public class func fromResultObjects(result: [AnyObject]) -> [[NSString: AnyObject]] {
|
|
|
|
return result as! [[NSString: AnyObject]]
|
|
}
|
|
}
|
|
|
|
|
|
// MARK: - Internal
|
|
|
|
internal extension CollectionType where Generator.Element == SelectTerm {
|
|
|
|
internal func applyToFetchRequest<T>(fetchRequest: NSFetchRequest, owner: T) {
|
|
|
|
fetchRequest.includesPendingChanges = false
|
|
fetchRequest.resultType = .DictionaryResultType
|
|
|
|
let entityDescription = fetchRequest.entity!
|
|
let propertiesByName = entityDescription.propertiesByName
|
|
let attributesByName = entityDescription.attributesByName
|
|
|
|
var propertiesToFetch = [AnyObject]()
|
|
for term in self {
|
|
|
|
switch term {
|
|
|
|
case ._Attribute(let keyPath):
|
|
if let propertyDescription = propertiesByName[keyPath] {
|
|
|
|
propertiesToFetch.append(propertyDescription)
|
|
}
|
|
else {
|
|
|
|
CoreStore.log(
|
|
.Warning,
|
|
message: "The property \"\(keyPath)\" does not exist in entity \(cs_typeName(entityDescription.managedObjectClassName)) and will be ignored by \(cs_typeName(owner)) query clause."
|
|
)
|
|
}
|
|
|
|
case ._Aggregate(let function, let keyPath, let alias, let nativeType):
|
|
if let attributeDescription = attributesByName[keyPath] {
|
|
|
|
let expressionDescription = NSExpressionDescription()
|
|
expressionDescription.name = alias
|
|
if nativeType == .UndefinedAttributeType {
|
|
|
|
expressionDescription.expressionResultType = attributeDescription.attributeType
|
|
}
|
|
else {
|
|
|
|
expressionDescription.expressionResultType = nativeType
|
|
}
|
|
expressionDescription.expression = NSExpression(
|
|
forFunction: function,
|
|
arguments: [NSExpression(forKeyPath: keyPath)]
|
|
)
|
|
|
|
propertiesToFetch.append(expressionDescription)
|
|
}
|
|
else {
|
|
|
|
CoreStore.log(
|
|
.Warning,
|
|
message: "The attribute \"\(keyPath)\" does not exist in entity \(cs_typeName(entityDescription.managedObjectClassName)) and will be ignored by \(cs_typeName(owner)) query clause."
|
|
)
|
|
}
|
|
|
|
case ._Identity(let alias, let nativeType):
|
|
let expressionDescription = NSExpressionDescription()
|
|
expressionDescription.name = alias
|
|
if nativeType == .UndefinedAttributeType {
|
|
|
|
expressionDescription.expressionResultType = .ObjectIDAttributeType
|
|
}
|
|
else {
|
|
|
|
expressionDescription.expressionResultType = nativeType
|
|
}
|
|
expressionDescription.expression = NSExpression.expressionForEvaluatedObject()
|
|
|
|
propertiesToFetch.append(expressionDescription)
|
|
}
|
|
}
|
|
|
|
fetchRequest.propertiesToFetch = propertiesToFetch
|
|
}
|
|
|
|
internal func keyPathForFirstSelectTerm() -> KeyPath {
|
|
|
|
switch self.first! {
|
|
|
|
case ._Attribute(let keyPath):
|
|
return keyPath
|
|
|
|
case ._Aggregate(_, _, let alias, _):
|
|
return alias
|
|
|
|
case ._Identity(let alias, _):
|
|
return alias
|
|
}
|
|
}
|
|
}
|