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import unique objects in the same order as the array of import sources

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This commit is contained in:
Andrii Chernenko
2016-10-08 23:14:22 +02:00
parent 1a6fbad3d4
commit 32a388e0ca
1 changed files with 32 additions and 35 deletions
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67
Sources/Importing/BaseDataTransaction+Importing.swift
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@@ -183,8 +183,9 @@ public extension BaseDataTransaction {
}
/**
Updates existing `ImportableUniqueObject`s or creates them by importing from the specified array of import sources.
- Warning: While the array returned from `importUniqueObjects(...)` correctly maps to the order of `sourceArray`, the order of objects called with `ImportableUniqueObject` methods is arbitrary. Do not make assumptions that any particular object will be imported ahead or after another object.
Updates existing `ImportableUniqueObject`s or creates them by importing from the specified array of import sources.
Objects are called with `ImportableUniqueObject` methods in the same order as in import sources array.
The array returned from `importUniqueObjects(...)` correctly maps to the order of `sourceArray`.
- parameter into: an `Into` clause specifying the entity type
- parameter sourceArray: the array of objects to import values from
@@ -206,7 +207,8 @@ public extension BaseDataTransaction {
let entityType = into.entityClass as! T.Type
var mapping = Dictionary<T.UniqueIDType, T.ImportSource>()
var importSourceByID = Dictionary<T.UniqueIDType, T.ImportSource>()
let sortedIDs = try autoreleasepool {
return try sourceArray.flatMap { (source) -> T.UniqueIDType? in
@@ -216,49 +218,44 @@ public extension BaseDataTransaction {
return nil
}
mapping[uniqueIDValue] = source
importSourceByID[uniqueIDValue] = source
return uniqueIDValue
}
}
mapping = try autoreleasepool { try preProcess(mapping) }
var objects = Dictionary<T.UniqueIDType, T>()
for object in self.fetchAll(From(entityType), Where(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs)) ?? [] {
importSourceByID = try autoreleasepool { try preProcess(importSourceByID) }
var existingObjectsByID = Dictionary<T.UniqueIDType, T>()
self.fetchAll(From(entityType), Where(entityType.uniqueIDKeyPath, isMemberOf: sortedIDs))?
.forEach { existingObjectsByID[$0.uniqueIDValue] = $0 }
var insertedObjectsByID = Dictionary<T.UniqueIDType, T>()
for objectID in sortedIDs {
try autoreleasepool {
let uniqueIDValue = object.uniqueIDValue
guard let source = mapping.removeValue(forKey: uniqueIDValue),
entityType.shouldUpdate(from: source, in: self) else {
return
guard let source = importSourceByID[objectID] else { return }
if let object = existingObjectsByID[objectID] {
guard entityType.shouldUpdate(from: source, in: self) else { return }
try object.update(from: source, in: self)
}
try object.update(from: source, in: self)
objects[uniqueIDValue] = object
}
}
for (uniqueIDValue, source) in mapping {
try autoreleasepool {
guard entityType.shouldInsert(from: source, in: self) else {
else if entityType.shouldInsert(from: source, in: self) {
let object = self.create(into)
object.uniqueIDValue = objectID
try object.didInsert(from: source, in: self)
return
insertedObjectsByID[objectID] = object
}
let object = self.create(into)
object.uniqueIDValue = uniqueIDValue
try object.didInsert(from: source, in: self)
objects[uniqueIDValue] = object
}
}
return sortedIDs.flatMap { objects[$0] }
return sortedIDs.flatMap { existingObjectsByID[$0] ?? insertedObjectsByID[$0] }
}
}
}