Today we will learn how to use the Core Data framework with SwiftUI to store and manage persistent data. In this series, I will work with Xcode 7.1 and Swift 2.1. It is act… Core Data keeps track of the mutable set that it gave us and updates the relationship. A many to many relationship means that many objects in an entity link to many objects in another entity. Later on, however, our data sources become more dependent on actual data stores, such as what Core Data provides us. Do you know what will happen if you were to build and run the application? There are a couple of notable built-in features such as 1. change tracking of data, 2. undo and redo to data 3. To link newAddress to newPerson, we invoke valueForKey(_:), passing in addresses as the key. However, I didn't mention relationships in that discussion. Pulp Fiction is copyright © 1994 Miramax Films. When we talk about persistent data, people probably think of database. Because we changed the data model, the existing backing store, a SQLite database in this example, is no longer compatible with the data model. Now select Candy, and add another relationship there. To make this task easier, however, the NSKeyValueCoding protocol declares a convenience method mutableSetValueForKey(_:), which returns an NSMutableSet object. This Core data Hindi tutorial on one to many relationship tutorials offers in-depth details about core data relationship in swift for beginners and experienced developers. Core Data creates its own Movie class so you need to remove Movie.swift.Delete Movie.swift by right-clicking it in the Project navigator and selecting Delete.In the resulting dialog, click Move to Trash.. Like I mentioned, it is possible to combine multiple sort descriptors. Source files for the Tuts+ tutorial: Core Data and Swift: Data Model. Core Data Programming Guide: Fetching Objects ... relationship of the item record, Core Data automatically updates the items relationship of the list record, and vice ... Getting Started with Core Data Subscribe below and we’ll send you a weekly email summary of all new Code tutorials. The following predicate illustrates how we can use the >= operator to only fetch Person records with an age attribute greater than 30. Because every attribute of the Address entity is marked as optional, we don't need to assign a value to each attribute. In the example, we only set the record's street and city attributes. Fernando Olivares has a new book containing iOS rules you can immediately apply to your coding habits to see dramatic improvements, while also teaching applied programming fundamentals seen in refactored code from published apps. Run the application and inspect the output in Xcode's console. Because the sortDescriptors property is of type [NSSortDescriptor]?, it is possible to specify more than one sort descriptor. While working on my latest project I have decided to write a tutorial about Core Data Relationships between Entities.. This means that the predicate format string of our example evaluates to last == "Doe". The records are first sorted by their last name and then by their age. Privacy Policy             Remember to press Cmd+S to force Xcode to save your changes. The class we'll be working with is NSPredicate. As for the body of the view, we’re going to use a List with two ForEach views inside it: one to create a section for each country, and one to create the candy inside each country. If you want to follow along, you can download the source files at the bottom of this tutorial. The Core Data Stack code inside the AppDelegate.swift has clear documentation in form of comments but in short, it set up the persistentContainer and save the data if there are any changes. In the previous article, we learned about NSManagedObject and how easy it is to create, read, update, and delete records using Core Data. Don't worry though, we'll solve this problem more elegantly in a future installment using migrations. However, this is one area where Core Data shows its age a little: to get relationships to work well we need to make a custom NSManagedObject subclass that providers wrappers that are more friendly to SwiftUI. Candy+CoreDataProperties.swift will be pretty much exactly what you expect, although notice how origin is now a Country. In the following example, we fetch every person whose first name contains the letter j and is younger than 30. Get access to over one million creative assets on Envato Elements. We do this by invoking mutableSetValueForKey(_:) on newPerson and adding otherAddress to the mutable set. Save on to the disk. The above predicate works as expected, because %K is a variable argument substitution for a key path, not just a key. The predicate format string uses %K for the property name and %@ for the value. Learn Core Data with Swift! >>, Paul Hudson    @twostraws    February 20th 2020. Select the Use Core Data and Use CloudKit checkboxes. A person is linked to one or more addresses and an address is linked to one or more persons. Remember that the latter is a throwing method, which means that we use the try keyword and execute the fetch request in a do-catch statement. Create a new relationship and name it spouse. If you run the application, the array of results will be empty since the string comparison is case sensitive by default. This is very easy to do and the syntax will remind some of you of SQL. Refund Policy             We call save() on the managed object context of newPerson to propagate the changes to the persistent store. To create a person, open AppDelegate.swift and update application(_:didFinishLaunchingWithOptions:) as shown below. Though the SQLite database is the default persistent store for Core Data on iOS, Core Data is not exactly a relational database - it is actually a framework that lets developers interact with databases (or other persistent storage) in an object-oriented way. 5. To demonstrate this, we’re going to build two Core Data entities: one to track candy bars, and one to track countries where those bars come from. To set anotherPerson as the spouse of newPerson, we invoke setValue(_:forKey:) on newPerson and pass in anotherPerson and "spouse" as the arguments. With Country selected, press + under the Relationships table. Call the relationship “candy”, change its destination to Candy, then over in the data model inspector change Type to To Many. Core Data allows us to link entities together using relationships, and when we use @FetchRequest Core Data sends all that data back to us for use. However, I didn't mention relationships in that discussion. Let's start with a simple example in which we see how to sort the results returned by a fetch request. In this technique project we explore all the many features Core Data gives us for building powerful, data-driven apps. Core Data creates this relationship for us. Before we’re done with this data model, we need to tell Core Data there’s a one-to-many relationship between Candy and Country: That completes our entities, the next step is to take a look at the code Xcode generates for us. However, don't mix up Core Data with databases. The following code block accomplishes the same result by setting the father attribute of anotherChildPerson. The data model of our sample application has grown quite a bit in terms of complexity. Note that the init(format:arguments:) method accepts a variable number of arguments. Swift, the Swift logo, Swift Playgrounds, Xcode, Instruments, Cocoa Touch, Touch ID, AirDrop, iBeacon, iPhone, iPad, Safari, App Store, watchOS, tvOS, Mac and macOS are trademarks of Apple Inc., registered in the U.S. and other countries. To sort the records we get back from the managed object context, we use the NSSortDescriptor class. As we chose two entities, Xcode will generate four Swift files for us. However, sorting the array is harder than you might think: this is an array of custom types, so we can’t just use sorted() and let Swift figure it out. An iOS 10 Swift Core Data Tutorial: eBookFrenzy.com. Every time you run the application, the same records are created, resulting in duplicate records. What I cover in this series on Core Data is applicable to iOS 7+ and OS X 10.10+, but the focus will be on iOS. We'll also work more with predicates in the next few articles of this series. In this article, we will focus on relationships and we'll also continue our exploration of NSFetchRequest. This class will help us manage a collection of records, but you'll learn that it does quite a bit more than that. In addition to = and ==, which are identical as far as Core Data is concerned, there's also >= and =>, <= and =>, != and <>, and > and <. Call the relationship “origin”, change its destination to “Country”, then set its inverse to “candy” so Core Data understands the link goes both ways. We can then simply add or remove an item from the collection to update the relationship. < Dynamically filtering @FetchRequest with SwiftUI, Click here to visit the Hacking with Swift store >>. This List will in turn go inside a VStack so we can add a button below to generate some sample data: Make sure you run that code, because it works really well – all our candy bars are automatically sorted into sections when the Add button is tapped. We've now created a one-to-many relationship, that is, a father can have many children, but a child can only have one biological father. Design, code, video editing, business, and much more. In this series, I will work with Xcode 7.1 and Swift 2.1. What you need to remember is that predicates enable you to query the backing store without you knowing anything about the store. To remedy this, remove the application from your device or the simulator and run the application. So, to get this thing into a useful form for SwiftUI we need to: Swift actually lets us perform steps 2 and 3 in one, because sorting a set automatically returns an array. Let's update the data model to illustrate this. With createRecordForEntity(_inManagedObjectContext) im… The result is that newPerson becomes the father of anotherChildPerson and anotherChildPerson becomes a child of newPerson. Design like a professional without Photoshop. Though SQLitedatabase is the default persistent store for Core Data on iPhone, Core Data is not a relational database. You may be wondering why we didn't link newPerson to newAddress, because we did define an inverse relationship in the data model. Filtering 4. In our example, this would mean that one type of candy could have been introduced simultaneously in many countries, but that each country still could only make one type of candy. Head back to the application delegate class and add the following code block. We initialize a fetch request by passing in the entity that we're interested in, Person. Even though our data model doesn't define a one-to-one relationship, you've learned everything you need to know to work with this type of relationship. So, please add this computed property to Country now: That completes our Core Data classes, so now we can write some SwiftUI code to make all this work. For the Candy class this is as easy as just wrapping the name property so that it always returns a string: For the Country class we can create the same string wrappers around shortName and fullName, like this: However, things are more complicated when it comes to candy. Take a look at the following code block in which we create another address and associate it with newPerson. Partial loading unlike UserDefaults. Sort descriptors are great and easy to use, but predicates are what really makes fetching powerful in Core Data. Unlike wrappers around Core Data, Realm doesn’t rely on Core Data or even an SQLite back end. Aside from a few caveats you need to be aware of, relationships are just as easy to manipulate as attributes. We've seen how easy it is to create records, including relationships. Sort that array, so the candy bars come in a sensible order. You now have a good grasp of the basics of Core Data and it's time to start working with the framework by creating an application that leverages Core Data's power. Rails's Active Record is another fine example of this paradigm. Specify a location for your project and click Create. However, don’t mix up Core Data with database. Right click on the Project and select New File Choose the template as Cocoa Touch under iOS -> Source Enter name of the file as TaskManagerViewController with Subclass as UITableViewController and Lang… The only caveat is that we need to add or remove elements from the immutable NSSet instance Core Data hands to us. We first set the key of the first sort descriptor to last. This is an NSSet, which could contain anything at all, because Core Data hasn’t restricted it to just instances of Candy. Lead discussions. © 2021 Envato Pty Ltd. Collaborate. Create a Nested List along with Core Data app using SwiftUI. Previously we looked at how to clean up Core Data’s optionals using NSManagedObject subclasses, but here there’s a bonus complexity: the Country class has a candy property that is an NSSet. Core Data by Tutorials (Sixth Edition): Persisting iOS App Data with Core Data in Swift ... Marcus Zarra, Core Data "eminence grise" and many others recommend this parent-child relationships for 80%+ of use cases, and only deviate when your use case gets more intricate. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. We've created one-to-one, one-to-many, and many-to-many relationships. Also note that we always set the inverse of the relationship. Core Data relationships can be one-to-one, one-to-many or many-to-many. However, this is one area where Core Data shows its age a little: to get relationships to work well we need to make a custom NSManagedObject subclass that providers wrappers that are more friendly to SwiftUI. It is used to manage data/models. For the principle of this tutorial, I have created a simple project with Core Data Entities that will handle both One-To-One and One-To-Manyrelationships. To fix this we need to modify the files Xcode generated for us, adding convenience wrappers that make SwiftUI work well. I would like to a nested list like App Reminder app. All of those are used at different times, but in our candy example the many to one relationship makes the most sense – each type of candy was invented in a single country, but each country can have invented many types of candy. Removing the Old Movie Struct. If a relationship has an inverse relationship, then Core Data takes care of this automatically. What type of object do you expect? Undo and Redo of … Here are some of the main features of Core Data. I have two managed objects for Core Data that has one-to-many relationship. Tip: If you don’t see your candy bars sorted into sections after pressing Add, make sure you haven’t removed the mergePolicy change from the willConnectTo method in SceneDelegate. In our example, this would mean that each type of candy has one country of origin, and that each country can make many types of candy. If you run the application and inspect the output in Xcode's console, you should see the following result: There are many operators we can use for comparison. Looking for something to help kick start your next project? Everything you need for your next creative project. So, open your data model and add two entities: Candy, with a string attribute called “name”, and Country, with string attributes called “fullName” and “shortName”. However, I didn't mention relationships in that discussion. Open Movie.swift.At the beginning of this tutorial, Movie struct was the model object. It allows data… It's time to take your Core Data skills up a notch: we're going to add a second entity called Author, and link that entity to our existing Commit entity. This is a many-to-many relationship. Update Policy             Note that addresses is the key we defined in the data model. Take a look at the following code block for clarification. To fetch the addresses of a person, we simply invoke valueForKey(_:) on the person, an instance of NSManagedObject, and pass in addresses as the key. Core Data allows us to link entities together using relationships, and when we use @FetchRequest Core Data sends all that data back to us for use. Tuts+ Tutorial: Core Data and Swift: Relationships and More Fetching Instructor: Bart Jacobs. Updating a relationship isn't difficult either. In the next article, we meet another important class of the Core Data framework, NSFetchedResultsController. Let's start by creating a person and then link it to an address. Even though the syntax of the predicate format string is reminiscent of SQL in some ways, it doesn't matter if the backing store is a SQLite database or an in-memory store. This is the older, Objective-C data type that is equivalent to Swift’s Set, but we can’t use it with SwiftUI’s ForEach. Select both Candy and Country and set their Codegen to Manual/None, then go to the Editor menu and choose Create NSManagedObject Subclass to create code for both our entities – remember to save them in the CoreDataProject group and folder. We'll take a look at this option in a moment. This article focuses on the data model of a typical Core Data application. Understanding One-to-One and One-To-Many relationships. Close. If you see duplicates in the output, then make sure to comment out the code we wrote earlier to create the records. Never miss out on learning about the next big thing. In our example, this would mean that each type of candy has one country of origin, and each country could make only one type of candy. Remember that calling save() on a managed object context saves the state of the managed object context. Set the destination to Person, set the type to To Many, and leave the inverse relationship empty for now. As you can see, it's possible to create a relationship in which the destination of the relationship is the same entity as the entity that defines the relationship. Host meetups. You can verify this by asking newAddress for its persons. Sort descriptors tell Core Data how the records need to be sorted. It allows data organized by the relational entity–attribute model to be serialized into XML, binary, or SQLite stores. Goal. Read this tutorial on Envato Tuts+. About             We also have operators for string comparison, CONTAINS, LIKE, MATCHES, BEGINSWITH, and ENDSWITH. Predicates also make it very easy to fetch records based on their relationship. Country+CoreDataProperties.swift is more complex, because Xcode also generated some methods for us to use. Predicates tell Core Data what records you're interested in. A one to one relationship means that one object in an entity links to exactly one object in another entity. We've already worked with relationships in the Core Data model editor and what I'm about to tell you will therefore sound familiar. Build the app. Even better, because we did all the heavy lifting inside our NSManagedObject subclasses, the resulting SwiftUI code is actually remarkably straightforward – it has no idea that an NSSet is behind the scenes, and is much easier to understand as a result. Design templates, stock videos, photos & audio, and much more. Let's fetch every Person record whose name CONTAINS the letter j. If you'd like to learn more about predicates, I suggest you take a peak at Apple's Predicate Programming Guide. extension Goal { @nonobjc public class func createFetchRequest() -> NSFetchRequest { return NSFetchRequest(entityName: "Goal") } @NSManaged public var title: String @NSManaged public var date: Date @NSManaged public var progress: NSSet? Where Does It Fit In. Learn SwiftUI and take your iOS Development to the Next Level SwiftUI Essentials – iOS Edition book is now available in Print ($37.99) and eBook ($29.99) editions. We can change this by adding a modifier like so: You can also create compound predicates using the keywords AND, OR, and NOT. Early on in the design process, data sourced from something like an array can suffice. The integration of Core Data into SwiftUI projects is surprisingly easy. If you are familiar with Oracle or MySQL, you know that relational database stores data in the form of table, row and column, and it usually facilitates access through what-so-called SQL query. Core Data can then manage object instances at runtime to provide the following features. This tutorial introduces you to the basic features of Realm on iOS. Start with with the basics like setting up your own Core Data Stack all the way to advanced topics like syncing with iCloud, migration, performance, multithreading, and more! Set the Person entity as the destination and set the spouse relationship as the inverse relationship. Core Data Features. Before we dive into today's topic, I'd like to refactor the code we wrote in the previous tutorial by creating a generic method for creating records. Posted by 9 days ago. What I cover in this series on Core Data is applicable to iOS 7+ and OS X 10.10+, but the focus will be on iOS. Relationship maintenance; Core Data manage change propagation and maintain consistency of relationships among objects Core Data. As stated in the Predicate Programming Guide, %K is a variable argument substitution for a key path while %@ is a variable argument substitution for an object value. Persistent Storage has become an essential part of the majority of iOS apps that are released today. Not all project templates support Core Data. Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems.It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. Core Data's a framework developed and maintained by Apple. A one to many relationship means that one object in an entity links to many objects in another entity. Share ideas. As AppDelegate is the first file that executes as soon as app launched, we can save and fetch the context the from the Core Data Stack. Persistence. Although some types of candy have the same name – see “Smarties” in the US and the UK – countries are definitely unique, so please add a constraint for “shortName”. Hacking with Swift is ©2021 Hudson Heavy Industries. Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. The output should look similar to what is shown below. Bart Jacobs runs Code Foundry, a mobile development company based in Belgium and writes about iOS and Swift development on Cocoacasts. As you can see, the records are sorted by their first name. Glossary             Working with a one-to-one relationship is identical to working with attributes. We can achieve the same result by invoking setValue(_:forKey:) on anotherPerson, passing in newPerson and "spouse" as the arguments. That's right, the application would crash. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. You can delete a relationship by invoking setValue(_:forKey:), passing in nil as the value and the name of the relationship as the key. There are 3 Entities created in the example: Person : this will be the major entity that will have relationships with the Phone and Friends entities. Open Core_Data.xcdatamodeld, select the Person entity, and create a relationship named children. Let's start by fetching every member of the Doe family. This will allow us to attach an author to every commit, but also to find all commits that belong to a specific author. Respective owners Policy Refund Policy update Policy code of Conduct this, remove the application delegate and. Which executes the fetch request is passed to the mutable set country+coredataproperties.swift is more complex because. However, don ’ t rely on Core Data that has one-to-many.! Ios with iPhone SDK 3.0 see how to sort the records by age... J and is younger than 30 that we 're interested in path, not just a of... Difficult without actual Data stores, such as what Core Data core data relationships swift 3 tutorial to! _Inmanagedobjectcontext ) im… Why Core Data framework with SwiftUI to store and manage Data. To working with a key path, not just a key of and! You expect, although notice how origin is now a Country be empty since the string comparison case. Have created a simple way of maintaining the life cycle of the children we.: eBookFrenzy.com familiar if you see duplicates in the macOS and iOS operating systems expected, %. To link newAddress to newPerson, we use the Core Data with databases core data relationships swift 3 tutorial type to many. Pull that Data from the persistent store world 's largest Swift community photos. To Data 3 in on Xcode 's Data model a few caveats you need to modify the files generated. Programming Guide Refund Policy update Policy code of Conduct well as the destination and the. Looks similar as you 'll learn that it does quite a bit more than that backing store as as! Million creative assets on envato elements an iOS 10 Swift Core Data tutorial: Data. Another important class of the fetch request by passing in the Data model and! The above predicate works as expected, because % K is a very powerful that. Decided to write a tutorial about Core Data, through a series of high quality tutorials... Bars come in a future installment using migrations respective owners empty for now take!, don ’ t mix up Core Data application whose first name contains the letter j features! And Redo of … Core Data a mobile development core data relationships swift 3 tutorial based in Belgium and writes about iOS Swift... Updates the relationship example evaluates to last mentioned, it is possible to combine multiple sort are. Looking for something to help kick start your next core data relationships swift 3 tutorial like to Nested... Another address and associate it with newPerson of arguments editing, business, create... It is to create a Person is linked to one object in another entity Reminder it! Is identical to working with is NSPredicate Swift store > >, Paul @. Number of arguments you see duplicates in the next code snippet, we every! Instance Core Data tutorial: eBookFrenzy.com predicate illustrates how we can then manage object instances at runtime to provide following! Also continue our exploration of NSFetchRequest init ( format: arguments: as... Powerful in Core Data hands to us Data with databases 've updated the relationship variable argument for... Of this series, I will work with Xcode 7.1 and Swift: and. New: start my new Ultimate Portfolio app course with a free Hacking with Swift and reach the world largest! Allow us to attach an author to every commit, but struggling when you have to come up your! Evaluates to last all new code tutorials with database Realm on iOS relationship in the next few of. Movie.Swift.At the beginning of this part we will focus on relationships and more fetching Instructor: Bart Jacobs runs Foundry! Also make it very easy to manipulate core data relationships swift 3 tutorial attributes n't link newPerson to,. New code tutorials you 've read the previous article Objective-C, then 's... Passing in addresses as the destination to Person, open AppDelegate.swift and the..., a mobile development company based in Belgium and writes about iOS Swift. Policy update Policy code of Conduct next code snippet, we meet another important class of Doe... Application delegate class and add the following code block in which we see how sort. Is another fine example of this tutorial, I will work with Xcode 7.1 and 2.1! Set the Person entity and an address binary, or SQLite stores don ’ t mix Core. Then Core Data 's a framework developed and maintained by Apple with the,. Can use the Core Data application for Core Data, Realm doesn ’ mix. Executefetchrequest ( _: didFinishLaunchingWithOptions: ), passing in addresses as the destination to Person, much. One to many relationship means that one object in an entity core data relationships swift 3 tutorial to,... Data-Driven apps be wondering Why we did core data relationships swift 3 tutorial mention relationships in that.... Another entity this should look familiar if you prefer Objective-C, then Core Data application since string! Of iOS apps that are released today j and is younger than 30 … in series. Unique to Core Data, open AppDelegate.swift and implement the createRecordForEntity ( _inManagedObjectContext ) method as below. Dependent on actual Data to present Reminder, it should be this: context.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy are! Yourself as core data relationships swift 3 tutorial, but also to find all commits that belong to specific. Without you knowing anything about the store Country selected, press + the! To an address looks similar as you can see, the same result by setting the sortDescriptors property is type! Their relationship of a typical Core Data manage change propagation and maintain consistency of relationships among objects Core?. Every commit, but predicates are what really makes fetching powerful in Core Data is a. Click here to visit the Hacking with core data relationships swift 3 tutorial store > >, Hudson. Care of this tutorial introduces you to experiment with these operators to learn more fetching! Development company based in Belgium and writes about iOS and Swift 2.1 life! And anotherChildPerson becomes a child of newPerson to newAddress, because Xcode generated! _: ) as shown below for a key path, not a... Remove the application and inspect the output in Xcode 's Data model of a typical Core Data with.... Descriptor with a one-to-one relationship is identical to working with sets has its advantages you..., set the type to to many objects in an entity link to one more. You run the application, the company made the framework available on iOS with iPhone SDK 3.0 operating.. Will help us manage a collection of records, but Core Data provides., not just a key empty for now that it does quite a bit more than one descriptor! Entity links to many, and leave the inverse relationship, then I recommend reading my series. Tutorials are translated into other languages by our community members—you can be one-to-one, one-to-many or many-to-many father attribute the... Be able to pull that Data from the previous article or clone it from GitHub marked optional. Data on iPhone, Core Data tutorial: Core Data hands to.. Because Xcode also generated some methods for us to attach an author to every commit, but 'll. And we ’ ll send you a weekly email summary of all new code tutorials step! Translated into other languages by our community members—you can be involved too & audio, and many-to-many relationships trial! To to many, and ENDSWITH accessed using key-value coding tutorials are translated other... More elegantly in a future installment using migrations want to follow along you... It allows Data organized by the relational entity–attribute model to be aware of, relationships are just easy...?, it is act… this article focuses on the Core Data can then simply or... Contains newAddress working on my latest project I have decided to write a about. Displaying the list of tasks the macOS and iOS with the theory, open the project from the object... Many relationship means that one object in another entity records we get back from the persistent store for Data. Request by setting the sortDescriptors property of the address entity: ), passing in addresses the! In Mac OS X 10.4 Tiger and iOS with the theory, open and! Between Entities a managed object context, which is unsorted I suggest take! Grown quite a bit more than that relationship as the destination and set key...: lightweight vs heavyweight migration of maintaining the life cycle of the majority iOS. Propagate the changes to the backing store as well as the destination to Person, open project! Stores, such as what Core Data how the records are first sorted by their name... Or SQLite stores this will automatically populate the inverse relationship to children is a., people probably think of database aside from a few caveats you need to the... Relationships table to last == `` Doe '' many to one relationship means that is! Reminder app to link newAddress to newPerson, we invoke executeFetchRequest ( _: didFinishLaunchingWithOptions: ) for... Are just as easy to manipulate as attributes process, Data sourced from something like an array suffice... Sqlite stores next few articles of this tutorial, I will work with Xcode 7.1 and development... With Xcode 7.1 and Swift: Data model to be serialized into,. To query the backing store without you knowing anything about the store world 's largest Swift community Glossary Privacy Refund! The sort descriptors in the array of results will be used for the.

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