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Use a Set rather than an O(n) thing to unique DatabaseObjects.

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This commit is contained in:
Brent Simmons 2024-05-26 12:13:01 -07:00
parent 666f1d9f4a
commit b5d132717d
1 changed files with 6 additions and 18 deletions
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24
Database/Sources/Database/Related Objects/DatabaseLookupTable.swift
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@ -126,7 +126,7 @@ private extension DatabaseLookupTable {
// Save the actual related objects.
let relatedObjectsToSave = uniqueArrayOfRelatedObjects(with: objects)
let relatedObjectsToSave = uniqueRelatedObjects(with: objects)
if relatedObjectsToSave.isEmpty {
assertionFailure("updateRelationships: expected relatedObjectsToSave would not be empty. This should be unreachable.")
return
@ -135,24 +135,12 @@ private extension DatabaseLookupTable {
relatedTable.save(relatedObjectsToSave, in: database)
}
func uniqueArrayOfRelatedObjects(with objects: [DatabaseObject]) -> [DatabaseObject] {
// Can’t create a Set, because we can’t make a Set<DatabaseObject>, because protocol-conforming objects can’t be made Hashable or even Equatable.
// We still want the array to include only one copy of each object, but we have to do it the slow way. Instruments will tell us if this is a performance problem.
func uniqueRelatedObjects(with objects: [DatabaseObject]) -> [DatabaseObject] {
var relatedObjectsUniqueArray = [DatabaseObject]()
for object in objects {
guard let relatedObjects = object.relatedObjectsWithName(relationshipName) else {
assertionFailure("uniqueArrayOfRelatedObjects: expected every object to have related objects.")
continue
}
for relatedObject in relatedObjects {
if !relatedObjectsUniqueArray.includesObjectWithDatabaseID(relatedObject.databaseID) {
relatedObjectsUniqueArray += [relatedObject]
}
}
}
return relatedObjectsUniqueArray
// All of our objects that conform to DatabaseObject are Hashable.
// If that’s ever not true, this will crash when run from Xcode.
let objectSet = Set(objects as! [AnyHashable])
return Array(objectSet) as! [DatabaseObject]
}
func syncRelatedObjectsAndLookupTable(_ object: DatabaseObject, _ lookupTable: RelatedObjectIDsMap, _ database: FMDatabase) {