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47 lines
1.1 KiB
Swift
47 lines
1.1 KiB
Swift
//
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// RelatedObjectsMap.swift
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// RSDatabase
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//
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// Created by Brent Simmons on 9/10/17.
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// Copyright © 2017 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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// Map objectID to [DatabaseObject] (related objects).
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// It’s used as the return value for DatabaseLookupTable.fetchRelatedObjects.
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public struct RelatedObjectsMap {
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private let dictionary: [String: [DatabaseObject]] // objectID: relatedObjects
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init(relatedObjects: [DatabaseObject], relatedObjectIDsMap: RelatedObjectIDsMap) {
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var d = [String: [DatabaseObject]]()
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let relatedObjectsDictionary = relatedObjects.dictionary()
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for objectID in relatedObjectIDsMap.objectIDs() {
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if let relatedObjectIDs = relatedObjectIDsMap[objectID] {
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let relatedObjects = relatedObjectIDs.compactMap{ relatedObjectsDictionary[$0] }
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if !relatedObjects.isEmpty {
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d[objectID] = relatedObjects
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}
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}
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}
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self.dictionary = d
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}
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public func objectIDs() -> Set<String> {
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return Set(dictionary.keys)
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}
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public subscript(_ objectID: String) -> [DatabaseObject]? {
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get {
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return dictionary[objectID]
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}
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}
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}
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