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More progress on relationships.

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This commit is contained in:
Brent Simmons 2017-08-07 19:37:31 -07:00
parent 4223808c74
commit 7edc76cd6e
2 changed files with 31 additions and 7 deletions
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2
Frameworks/RSDatabase/DatabaseTable.swift
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@ -14,6 +14,8 @@ public protocol DatabaseTable {
var queue: RSDatabaseQueue {get}
init(name: String, queue: RSDatabaseQueue)
func fetchObjectsWithIDs<T>(_ databaseIDs: Set<String>, _ database: FMDatabase) -> [T]
}
public extension DatabaseTable {

38
Frameworks/RSDatabase/RSDatabase/LookupTable.swift
View File

@ -15,7 +15,7 @@ import Foundation
// foreignIDsWithNoRelationship: caches the foreignIDs where it’s known that there’s no relationship.
// lookupsByForeignID: caches the LookupValues for a foreignID.
typealias LookupTableDictionary = [String: Set<LookupValue>] // key is foreignID
public typealias LookupTableDictionary = [String: Set<LookupValue>] // key is foreignID
public final class LookupTable {
@ -64,22 +64,32 @@ public final class LookupTable {
return lookupTableDictionary(with: lookupValues)
}
public func attachRelationships<T,U>(_ objects: [T], idKeyPath: KeyPath<T,String>, relationshipKeyPath: KeyPath<T,[U]>, table: DatabaseTable, lookupTableDictionary: LookupTableDictionary, database: FMDatabase) {
public func attachRelationships<T,U>(to objects: [T], idKeyPath: KeyPath<T,String>, relatedIDKeyPath: KeyPath<U,String>, relationshipKeyPath: KeyPath<T,[U]>, table: DatabaseTable, lookupTableDictionary: LookupTableDictionary, database: FMDatabase) {
let primaryIDs = primaryIDsInLookupTableDictionary(lookupTableDictionary)
let relatedObjects = table.fetchObjectsWithIDs(primaryIDs, database)
if (primaryIDs.isEmpty) {
return
}
let relatedObjects: [U] = table.fetchObjectsWithIDs(primaryIDs, database)
if relatedObjects.isEmpty {
return
}
let relatedObjectsDictionary = createRelatedObjectsDictionary(relatedObjects, idKeyPath: relatedIDKeyPath)
for object in objects {
let identifier = object[keyPath: idKeyPath]
if let lookupValues = lookupTableDictionary[identifier] {
let relatedObjects = lookupValues.flatMap{ (lookupValue) -> U? in
<#code#>
if let lookupValues = lookupTableDictionary[identifier], !lookupValues.isEmpty {
let primaryIDs = lookupValues.primaryIDs()
let oneObjectRelatedObjects = primaryIDs.flatMap{ (primaryID) -> U? in
return relatedObjectsDictionary[primaryID]
}
object[keyPath: relationshipKeyPath] = oneObjectRelatedObjects
}
}
}
}
func primaryIDsInLookupTableDictionary(_ lookupTableDictionary: LookupTableDictionary) -> Set<String> {
var primaryIDs = Set<String>()
@ -109,6 +119,18 @@ public final class LookupTable {
private extension LookupTable {
func createRelatedObjectsDictionary<T>(_ relatedObjects: [T], idKeyPath: KeyPath<T,String>) -> [String: T] {
var d = [String: T]()
for object in relatedObjects {
let identifier = object[keyPath: idKeyPath]
d[identifier] = object
}
return d
}
func addToLookupTableDictionary(_ lookupValues: Set<LookupValue>, _ table: inout LookupTableDictionary) {
for lookupValue in lookupValues {