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92 lines
2.8 KiB
Swift
92 lines
2.8 KiB
Swift
//
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// Relationship.swift
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// CoreStore
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//
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// Copyright © 2018 John Rommel Estropia
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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import CoreData
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import Foundation
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// MARK: - DynamicObject
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extension DynamicObject where Self: CoreStoreObject {
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/**
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The containing type for relationships. `Relationship`s can be any `CoreStoreObject` subclass.
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```
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class Dog: CoreStoreObject {
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let master = Relationship.ToOne<Person>("master")
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}
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class Person: CoreStoreObject {
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let pets = Relationship.ToManyUnordered<Dog>("pets", inverse: { $0.master })
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}
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```
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- Important: `Relationship` properties are required to be stored properties. Computed properties will be ignored, including `lazy` and `weak` properties.
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*/
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public typealias Relationship = RelationshipContainer<Self>
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}
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// MARK: - RelationshipContainer
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/**
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The containing type for relationships. Use the `DynamicObject.Relationship` typealias instead for shorter syntax.
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```
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class Dog: CoreStoreObject {
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let master = Relationship.ToOne<Person>("master")
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}
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class Person: CoreStoreObject {
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let pets = Relationship.ToManyUnordered<Dog>("pets", inverse: { $0.master })
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}
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```
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*/
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public enum RelationshipContainer<O: CoreStoreObject> {
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// MARK: - DeleteRule
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/**
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These constants define what happens to relationships when an object is deleted.
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*/
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public enum DeleteRule {
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// MARK: Public
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case nullify
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case cascade
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case deny
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// MARK: Internal
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internal var nativeValue: NSDeleteRule {
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switch self {
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case .nullify: return .nullifyDeleteRule
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case .cascade: return .cascadeDeleteRule
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case .deny: return .denyDeleteRule
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}
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}
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}
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}
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