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Code Issues 95 Packages Projects Releases 10 Wiki Activity

disallow "empty" default values on some ImportableAttributeTypes

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John Rommel Estropia
2017-05-28 10:50:25 +09:00
parent ef0937fec4
commit da9e8c1550
3 changed files with 238 additions and 163 deletions
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41
Sources/Value.swift
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@@ -102,7 +102,7 @@ public enum ValueContainer<O: CoreStoreObject> {
}
```
- parameter keyPath: the permanent attribute name for this property.
- parameter default: the initial value for the property when the object is first created. Defaults to the `ImportableAttributeType`'s empty value if not specified.
- parameter default: the initial value for the property when the object is first created. For types that implement `EmptyableAttributeType`s, this argument may be omitted and the type's "empty" value will be used instead (e.g. `false` for `Bool`, `0` for `Int`, `""` for `String`, etc.)
- parameter isIndexed: `true` if the property should be indexed for searching, otherwise `false`. Defaults to `false` if not specified.
- parameter isTransient: `true` if the property is transient, otherwise `false`. Defaults to `false` if not specified. The transient flag specifies whether or not a property's value is ignored when an object is saved to a persistent store. Transient properties are not saved to the persistent store, but are still managed for undo, redo, validation, and so on.
- parameter versionHashModifier: used to mark or denote a property as being a different "version" than another even if all of the values which affect persistence are equal. (Such a difference is important in cases where the properties are unchanged but the format or content of its data are changed.)
@@ -115,7 +115,7 @@ public enum ValueContainer<O: CoreStoreObject> {
- parameter finalNewValue: the transformed new value
- parameter originalNewValue: the original new value
*/
public init(_ keyPath: KeyPath, `default`: V = V.cs_emptyValue(), isIndexed: Bool = false, isTransient: Bool = false, versionHashModifier: String? = nil, renamingIdentifier: String? = nil, customGetter: @escaping (_ `self`: O, _ getValue: () -> V) -> V = { $1() }, customSetter: @escaping (_ `self`: O, _ setValue: (_ finalNewValue: V) -> Void, _ originalNewValue: V) -> Void = { $1($2) }) {
public init(_ keyPath: KeyPath, `default`: V, isIndexed: Bool = false, isTransient: Bool = false, versionHashModifier: String? = nil, renamingIdentifier: String? = nil, customGetter: @escaping (_ `self`: O, _ getValue: () -> V) -> V = { $1() }, customSetter: @escaping (_ `self`: O, _ setValue: (_ finalNewValue: V) -> Void, _ originalNewValue: V) -> Void = { $1($2) }) {
self.keyPath = keyPath
self.isIndexed = isIndexed
@@ -338,6 +338,43 @@ public enum ValueContainer<O: CoreStoreObject> {
}
}
public extension ValueContainer.Required where V: EmptyableAttributeType {
/**
Initializes the metadata for the property. This convenience initializer uses the `EmptyableAttributeType`'s "empty" value as the initial value for the property when the object is first created (e.g. `false` for `Bool`, `0` for `Int`, `""` for `String`, etc.)
```
class Person: CoreStoreObject {
let title = Value.Required<String>("title") // initial value defaults to empty string
}
```
- parameter keyPath: the permanent attribute name for this property.
- parameter isIndexed: `true` if the property should be indexed for searching, otherwise `false`. Defaults to `false` if not specified.
- parameter isTransient: `true` if the property is transient, otherwise `false`. Defaults to `false` if not specified. The transient flag specifies whether or not a property's value is ignored when an object is saved to a persistent store. Transient properties are not saved to the persistent store, but are still managed for undo, redo, validation, and so on.
- parameter versionHashModifier: used to mark or denote a property as being a different "version" than another even if all of the values which affect persistence are equal. (Such a difference is important in cases where the properties are unchanged but the format or content of its data are changed.)
- 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 to make final transformations to the property's value before returning from the getter.
- parameter self: the `CoreStoreObject`
- parameter getValue: the original getter for the property
- parameter customSetter: use this closure to make final transformations to the new value before assigning to the property.
- parameter setValue: the original setter for the property
- parameter finalNewValue: the transformed new value
- parameter originalNewValue: the original new value
*/
public convenience init(_ keyPath: KeyPath, isIndexed: Bool = false, isTransient: Bool = false, versionHashModifier: String? = nil, renamingIdentifier: String? = nil, customGetter: @escaping (_ `self`: O, _ getValue: () -> V) -> V = { $1() }, customSetter: @escaping (_ `self`: O, _ setValue: (_ finalNewValue: V) -> Void, _ originalNewValue: V) -> Void = { $1($2) }) {
self.init(
keyPath,
default: V.cs_emptyValue(),
isIndexed: isIndexed,
isTransient: isTransient,
versionHashModifier: versionHashModifier,
renamingIdentifier: renamingIdentifier,
customGetter: customGetter,
customSetter: customSetter
)
}
}
// MARK: - TransformableContainer