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83 lines
2.1 KiB
Swift
83 lines
2.1 KiB
Swift
//
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// DatabaseRelatedObjectsTable.swift
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// RSDatabase
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//
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// Created by Brent Simmons on 9/2/17.
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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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// Protocol for a database table for related objects — authors, tags, and attachments in Evergreen, for instance.
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public protocol DatabaseRelatedObjectsTable: DatabaseTable {
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var databaseIDKey: String { get}
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var cache: DatabaseObjectCache { get }
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func fetchObjectsWithIDs(_ databaseIDs: Set<String>, in database: FMDatabase) -> [DatabaseObject]?
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func objectsWithResultSet(_ resultSet: FMResultSet) -> [DatabaseObject]
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func objectWithRow(_ row: FMResultSet) -> DatabaseObject?
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func save(_ objects: [DatabaseObject], in database: FMDatabase)
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}
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public extension DatabaseRelatedObjectsTable {
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// MARK: Default implementations
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func fetchObjectsWithIDs(_ databaseIDs: Set<String>, in database: FMDatabase) -> [DatabaseObject]? {
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if databaseIDs.isEmpty {
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return nil
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}
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var cachedObjects = [DatabaseObject]()
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var databaseIDsToFetch = Set<String>()
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for databaseID in databaseIDs {
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if let cachedObject = cache[databaseID] {
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cachedObjects += [cachedObject]
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}
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else {
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databaseIDsToFetch.insert(databaseID)
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}
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}
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if databaseIDsToFetch.isEmpty {
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return cachedObjects
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}
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guard let resultSet = selectRowsWhere(key: databaseIDKey, inValues: Array(databaseIDsToFetch), in: database) else {
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return cachedObjects
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}
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let fetchedDatabaseObjects = objectsWithResultSet(resultSet)
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cache.add(fetchedDatabaseObjects)
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return cachedObjects + fetchedDatabaseObjects
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}
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func objectsWithResultSet(_ resultSet: FMResultSet) -> [DatabaseObject] {
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return resultSet.flatMap(objectWithRow)
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}
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func save(_ objects: [DatabaseObject], in database: FMDatabase) {
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// Objects in cache must already exist in database. Filter them out.
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let objectsToSave = objects.filter { (object) -> Bool in
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if let _ = cache[object.databaseID] {
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return false
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}
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return true
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}
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cache.add(objectsToSave)
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if let databaseDictionaries = objectsToSave.databaseDictionaries() {
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insertRows(databaseDictionaries, insertType: .orIgnore, in: database)
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}
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}
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}
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