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Code Issues 95 Packages Projects Releases 10 Wiki Activity

FetchableSource and QueryableSource protocols

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This commit is contained in:
John Estropia
2016-11-15 18:00:39 +09:00
parent 33a5c123aa
commit b230ed6400
21 changed files with 967 additions and 566 deletions
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Sources/Fetching and Querying/DataStack+Querying.swift
+21 -19
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@@ -29,7 +29,9 @@ import CoreData
// MARK: - DataStack
public extension DataStack {
extension DataStack: FetchableSource, QueryableSource {
// MARK: FetchableSource
/**
Fetches the `NSManagedObject` instance in the `DataStack`'s context from a reference created from a transaction or from a different managed object context.
@@ -39,14 +41,7 @@ public extension DataStack {
*/
public func fetchExisting<T: NSManagedObject>(_ object: T) -> T? {
do {
return (try self.mainContext.existingObject(with: object.objectID) as! T)
}
catch _ {
return nil
}
return self.mainContext.fetchExisting(object)
}
/**
@@ -57,14 +52,7 @@ public extension DataStack {
*/
public func fetchExisting<T: NSManagedObject>(_ objectID: NSManagedObjectID) -> T? {
do {
return (try self.mainContext.existingObject(with: objectID) as! T)
}
catch _ {
return nil
}
return self.mainContext.fetchExisting(objectID)
}
/**
@@ -75,7 +63,7 @@ public extension DataStack {
*/
public func fetchExisting<T: NSManagedObject, S: Sequence>(_ objects: S) -> [T] where S.Iterator.Element == T {
return objects.flatMap { (try? self.mainContext.existingObject(with: $0.objectID)) as? T }
return self.mainContext.fetchExisting(objects)
}
/**
@@ -86,7 +74,7 @@ public extension DataStack {
*/
public func fetchExisting<T: NSManagedObject, S: Sequence>(_ objectIDs: S) -> [T] where S.Iterator.Element == NSManagedObjectID {
return objectIDs.flatMap { (try? self.mainContext.existingObject(with: $0)) as? T }
return self.mainContext.fetchExisting(objectIDs)
}
/**
@@ -249,6 +237,9 @@ public extension DataStack {
return self.mainContext.fetchObjectIDs(from, fetchClauses)
}
// MARK: QueryableSource
/**
Queries aggregate values as specified by the `QueryClause`s. Requires at least a `Select` clause, and optional `Where`, `OrderBy`, `GroupBy`, and `Tweak` clauses.
@@ -324,4 +315,15 @@ public extension DataStack {
)
return self.mainContext.queryAttributes(from, selectClause, queryClauses)
}
// MARK: FetchableSource, QueryableSource
/**
The internal `NSManagedObjectContext` managed by this instance. Using this context directly should typically be avoided, and is provided by CoreStore only for extremely specialized cases.
*/
public func internalContext() -> NSManagedObjectContext {
return self.mainContext
}
}