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Field.Coded implementations for transformable attributes

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John Estropia
2020-01-18 16:22:06 +09:00
parent 43f61359da
commit bcc2d9def3
22 changed files with 1505 additions and 101 deletions
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12
Sources/Field.Computed.swift
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@@ -79,14 +79,12 @@ extension FieldContainer {
}
```
- parameter keyPath: the permanent attribute name for this property.
- parameter renamingIdentifier: used to resolve naming conflicts between models. When creating an entity mapping between entities in two managed object models, a source entity property and a destination entity property that share the same identifier indicate that a property mapping should be configured to migrate from the source to the destination. If unset, the identifier will be the property's name.
- parameter customGetter: use this closure as an "override" for the default property getter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.primitiveValue(for:)` instead of `PartialObject<O>.value(for:)`, which would unintentionally execute the same closure again recursively.
- parameter customSetter: use this closure as an "override" for the default property setter. The closure receives a `PartialObject<O>`, which acts as a fast, type-safe KVC interface for `CoreStoreObject`. The reason a `CoreStoreObject` instance is not passed directly is because the Core Data runtime is not aware of `CoreStoreObject` properties' static typing, and so loading those info everytime KVO invokes this accessor method incurs a cumulative performance hit (especially in KVO-heavy operations such as `ListMonitor` observing.) When accessing the property value from `PartialObject<O>`, make sure to use `PartialObject<O>.setPrimitiveValue(_:for:)` instead of `PartialObject<O>.setValue(_:for:)`, which would unintentionally execute the same closure again recursively.
- parameter affectedByKeyPaths: a set of key paths for properties whose values affect the value of the receiver. This is similar to `NSManagedObject.keyPathsForValuesAffectingValue(forKey:)`.
*/
public init(
_ keyPath: KeyPathString,
renamingIdentifier: @autoclosure @escaping () -> String? = nil,
customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
@@ -94,7 +92,6 @@ extension FieldContainer {
self.init(
keyPath: keyPath,
isOptional: false,
renamingIdentifier: renamingIdentifier,
customGetter: customGetter,
customSetter: customSetter,
affectedByKeyPaths: affectedByKeyPaths
@@ -102,14 +99,13 @@ extension FieldContainer {
}
/**
Overload for compiler message only
Overload for compiler error message only
*/
@available(*, unavailable, message: "Field.Computed properties are not allowed to have default values.")
@available(*, unavailable, message: "Field.Computed properties are not allowed to have initial values, including `nil`.")
public init(
wrappedValue initial: @autoclosure @escaping () -> V,
_ keyPath: KeyPathString,
versionHashModifier: @autoclosure @escaping () -> String? = nil,
renamingIdentifier: @autoclosure @escaping () -> String? = nil,
customGetter: ((_ partialObject: PartialObject<O>) -> V)? = nil,
customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? = nil,
affectedByKeyPaths: @autoclosure @escaping () -> Set<KeyPathString> = []) {
@@ -274,7 +270,6 @@ extension FieldContainer {
fileprivate init(
keyPath: KeyPathString,
isOptional: Bool,
renamingIdentifier: @escaping () -> String?,
customGetter: ((_ partialObject: PartialObject<O>) -> V)?,
customSetter: ((_ partialObject: PartialObject<O>, _ newValue: V) -> Void)? ,
affectedByKeyPaths: @escaping () -> Set<KeyPathString>) {
@@ -287,7 +282,8 @@ extension FieldContainer {
isTransient: true,
allowsExternalBinaryDataStorage: false,
versionHashModifier: nil,
renamingIdentifier: renamingIdentifier(),
renamingIdentifier: nil,
valueTransformer: nil,
affectedByKeyPaths: affectedByKeyPaths(),
defaultValue: nil
)