fetchFirst

Author: Gregory Higley

Sources/CoreDataQueryInterface/QueryBuilder+Fetch.swift

@@ -91,6 +91,10 @@ public extension QueryBuilder {
     try dictionaries().fetch(managedObjectContext) as! [[String: Any]]
   }
 
+  func fetchFirst(_ managedObjectContext: NSManagedObjectContext? = nil) throws -> R? {
+    try limit(1).fetch(managedObjectContext).first
+  }
+  
   func count(_ managedObjectContext: NSManagedObjectContext? = nil) throws -> Int {
     guard let moc = self.managedObjectContext ?? managedObjectContext else {
       preconditionFailure("No NSManagedObjectContext instance on which to execute the request.")

Tests/CoreDataQueryInterfaceTests/Store.swift

@@ -47,7 +47,7 @@ enum Store {
       let languageNames = info["ls"] as! [String]
       var languages: Set<Language> = []
       for name in languageNames {
-        let language = try! moc.query(Language.self).filter { $0.name == name }.fetch().first!
+        let language = try! moc.query(Language.self).filter { $0.name == name }.fetchFirst()!
         languages.insert(language)
       }
       let developer = Developer(context: moc)