Unable to query for date using NSPredicate in Swift (2) ... later than a specific date. Swifty CoreData. Thanks for your support, Vitali Tatarintev! What am I doing wrong? I usually do … To start, download the project materials using the Download Materials button at the top or bottom of this tutorial. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. 7. >>, Paul Hudson    @twostraws    October 10th 2019. Loading Core Data objects using , The way fetch requests work is very simple: you create one from the NSManagedObject subclass you're using for your entity, then pass it to managed object The simplest way to fetch data using a fetch request while responding to any changes that impact your fetch request's results is to use an NSFetchResultsController. Call the fetchRequest () function of your entity to create a fetch request. On top of that, you need to look up for existing values using a fetch request which is less performant! I'm trying to prevent a user from adding a duplicate name into a Core Data entity. CoreData is a framework that helps you manage the model layer objects in your application and it’s quite simple to use as some of the needed code can be automatically generated.. A CoreData predicate has a simple format attribute == value which is very similar to aContact.uniqueId! In this series on concurrency in Swift, learn the two main methods of deleting data with CoreData, using background queues to avoid blocking the main one. Like with the process of inserting an item into core data, 0:24. fetching is a bit more involved. Swift: Fetch CoreData as Array (5) . December 11 , 2020 Andrew Rocky. Creating a fetch request is a common operation in Core Data. In this tutorial, you’ll learn how to improve your iOS app thanks to efficient Core Data usage with batch insert, persistent history and derived properties. ios - type - swift core data predicate . 0:30. The real tricky part about fetching data is that all arrays returned from Objective C are NSArrays of AnyObject. ios,swift,core-data. In this series, I will work with Xcode 7.1 and Swift 2.1. For example, using the example data from my setup instructions we could create a predicate like this: That will show details about Python, while ignoring other data. Code of Conduct. The data model is structured so that I have one master folder which contains other folders - and those folders can also contain other folders, via a "parentFolder" relationship. So Much Boilerplate. The saving of the data works fine. However, they can be super useful to maintain a unique set of data. 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. iOS Swift – Core Data examples with a complex data relationship. This cheat sheet is a handy reference to keep you productive with Core Data and Swift! If that is the case, and assuming you are using a SQLLite store, you cannot use a predicate based on YearRange to filter the fetch request. A perusal of Swift Documentation along with Apple's App Development with Swift provided me a good overview of the language and Object Oriented Programming. First of all get rid of all NSString and NSDictionary occurrences. Assume I have a managed object of type Country and I want to fetch a sorted array of visited countries. It allows data… ... there are three main points to delete our data: Create a request to filter the entity to delete. January 2, 2021 Andrew Rocky. You configure a fetch results controller using a fetch request that specifies the entity, an array containing at least one sort ordering, and optionally a filter predicate. I have two rows “Name” and “Category”. After I created a Relationship from Techniques to Categories, Core Data added this field to the Sqlite DB: ZCATEGORIES - INTEGER Let’s say I want to fetch all Techniques that belong to the category #3 (with internal ZID: 3) If I do this: request.predicate = NSPredicate(format: "categories == %@", 3) … Question or problem in the Swift programming language: I’m currently writing a simple phone book app in Swift and need to sort the results from a CoreData query. Introduction. Core Data, as one of the native persistence solutions, uses high performance and compact SQLite database as its default implementation. Core Data fetch requests can use predicates in SwiftUI just like they can with UIKit, all by providing a predicate property to your @FetchRequest property wrapper. In this post I round-up some other changes in iOS 10 and some quick tips you can use to clean up common Core Data code cluttering your view controllers. In this tutorial, we are going to build an expense tracker iOS app using Core Data and SwiftUI. To fetch the data of child relation I used following code but Faulting technique of core data does not seem to work as all data has to be structured during fetch request. So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller and get contactIdentifierString. I have written below code to convert child relation to [Child] extension UserMO: ManagedObjectProtocol {func toEntity() -> User? This will fetch all Movies stored by Core Data. This involves searching the whole database. Constraints in Core Data are part of an entity configuration. To fetch an item, we need to create a fetch request. In this article we are going to learn how to delete the data with CoreData using background queues—to avoid blocking the main queue. Use Fetch Requests to retrieve objects from disk. While this object is commonly used in conjunction with table views and collection views, we can also use it to drive a SwiftUI view. SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? Set this predicate as the predicate property of your fetch request. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. But what if you want to fetch data in different order according to the different circumstances. You learned how to use Core Data in SwiftUI to store data persistently. ... which allows for batch deletes based on whatever predicate you give it, ... Fetching Some Aggregate Data. Core Data tries to keep its memory footprint as low as possible and one of the strategies it uses to accomplish this is faulting. update - swift 3 core data fetch request . Geo-Location Predicate. These predicates are the same instances of NSPredicate that you would use without SwiftUI, which means you can use the same variety of string operations you would normally use. One reason could be that the entity name in your model is not "Article". Core Data, as one of the native persistence solutions, uses high performance and compact SQLite database as its default implementation. Core Data fetch requests can use predicates in SwiftUI just like they can with UIKit, all by providing a predicate property to your @FetchRequest property wrapper. I have worked with Core Data long time ago and left with a bad impression about the framework. The only optional you are force unwrapping with ! The second predicate specifies that we are only interested in item records that belong to a list record that has a name equal to Home. If you followed my Core Data and SwiftUI set up instructions, you’ve already injected your managed object context into the SwiftUI … My predicate is as follows: NSPredicate(format: "date > \(currentDate)") When I executed the fetch request I caught an exception: 'Unable to parse the format string "date > 2015-07-08 03:00:00 +0000"' I have worked with Core Data long time ago and left with a bad impression about the framework. Then build and run. Updated on July 27, 2016 – Additional Cheats Having trouble recalling how to perform basic Core Data operations? Refresh. Persisting user data in a productivity-based offline application is the essential primary feature that we need to provide to users. Tagged with ios, swiftui, coredata, database. (Transformables are stored in the SQL database as NSData blobs, and are only transformed back into the appropriate object types when loaded into memory. Fetches all objects (articles in our case) from the context’s store. Question or problem in the Swift programming language: I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. Execute your fetch request using the fetch (_:) function of your managed object context. Use the Swift native structs String and Dictionary. Put simply, a predicate is a filter: you specify the criteria you want to match, and Core Data will ensure that only matching objects get returned. The AppDelegate.swift file with Core Data Stack code; Core Data Stack . How to solve the problem: Solution 1: You should load all your Objects from CoreData into an Array/Dict of NSManaged Objects. Sponsor Hacking with Swift and reach the world's largest Swift community! Setup (Swift 2.3) lazy var applicationDocumentsDirectory: NSURL = { // The directory the application uses to store the Core Data store file. We could use that inside a fetch request like this: Because @FetchRequest uses standard Core Data predicates, you can create compound predicates too. How can I show all saved data? Fetch records between two dates using core data ios swift. I am searching the database to find a match for contactIdentifierString and find value for another attribute provider name. Unable to query for date using NSPredicate in Swift (2) ... later than a specific date. Is there a faster way by assigning a predicate to the context fetchRequest. i0S Swift Issue. So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview … Question or problem in the Swift programming language: I’m trying to understand how to model complex data relationships with Core Data. Run the application and inspect the result in the console. In this tutorial, we are going to build an expense tracker iOS app using Core Data and SwiftUI. Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. December 2018. Can someone suggest how to use predicates with contact fetchRequest? ios - type - swift core data predicate . The names in the CoreData database […] About             Home; About; NSPredicates && NSSortDescriptors in Core Data Fetching Data with advance Queries from Core Data: As you know that when you fetch data from sqlite database with NSFetchRequest() function you get the data in the order as you store it in the Core Data. When we fetched the records for the Person entity a moment ago, Core Data executed the fetch request, but it didn't fully initialize the … To give another concrete example, at a certain stage in my project, I needed to determine a method to store user data. I'm trying to convert a project that uses Core Data from Objective-C to Swift. My predicate is as follows: NSPredicate(format: "date > \(currentDate)") When I executed the fetch request I caught an exception: 'Unable to parse the format string "date > 2015-07-08 03:00:00 +0000"' I thought I could make a query like that. Sometimes it works with it, sometimes it doesn’t. Tagged with ios, swiftui, coredata, database. Core Data with Swift 3.0 ... • Persistent Store Coordinator • Relationships • Fetch Request, Predicate, Sort Descriptor • Fetched Results Controller Core Data Stack • Persistent Store Container 12. How to enumerate an enum with String type? Pulp Fiction is copyright © 1994 Miramax Films. Use Fetch Requests to retrieve objects from disk. The simplest way to fetch data using a fetch request while responding to any changes that impact your fetch request's results is to use an NSFetchResultsController. This is performed by defining a predicate that dictates criteria that a managed object must meet in order to be eligible for retrieval. == contactIdentifierString: The code assumes that there is a NSManagedObject subclass Contact containing, Configuring @IBInspectable Attribute Inspector controls, Translates the XInput calls to DirectInput calls on MAC OS X (Emulate x360 controller from PS3 one), Xcode build error – Multiple commands produce .o, Target ‘ProjectCoreData’ has compile command for Swift source files listed twice, How to implement UIVisualEffectView in UITableView with adaptive segues. 0:21. How to get overall CPU usage in iOS Swift 4.x, Get CPU usage percentage of single iOS App in Swift 4.x, Get the currently connected WiFi informations in Swift 4.x, Check connection from iOS device to server by Swift 4.X, Get the server’s current time with Swift 4.X URLSession, Write a log text file on Disk use TextOutputStream in Swift 4 iOS. The first predicate restricts the fetch request to item records that are marked as completed. Instantiate the Predicate class and create your search format. Define and create new model objects using Core Data. Let's look at some code: 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. 8.7k time ... subpredicates: [predicate1]) // Set the predicate on the fetch request request.predicate = predicate request.sortDescriptors = [NSSortDescriptor(key: "report_id", ascending: false)] var results : NSArray = context.executeFetchRequest(request, error: nil)! Home iOS & Swift Tutorials Modern, Efficient Core Data. I have no problems to fetch Data in Objective-C but in swift I dont get it! The code snippets below are here to help jog your memory when it’s been a while since you’ve worked in Core Data. This could easily lead to a lot of extra code to build up a fetch request with a given predicate. Assume I have a managed object of type Countryand I want to fetch a sorted array of visited countries. “name_f” is the user’s name. In iOS 10 SDK, Core Data, especially in Swift, has been changed a little bit, so in this chapter we will have a look at these changes as well as some basics of accessing Core Data. Let’s start out small and create a fetch request for stops close to 52° 29’ 57.30" North, +13° 25’ 5.40" East. Figure 1, A fetch request tells a Managed Object Context the entity of so comment out “User+CoreDataValidations.swift” file completely since it 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. Instantiate the Predicate … Core Data and Aggregate Fetches In Swift. One-to-many relationships with @FetchRequest and SwiftUI – Core , @JoakimDanielson comment works like a charm, but requires a few tweaks. At this stage of the App, the type of data was trivial and UserDefaults was a straightforward mechanism to store the data. Retrieving the data is done through a fetch request. Views. You can also configure a fetched request with a predicate to limit the results, such as only fetching Movies from a certain year or matching a certain genre. Since we’re going to be doing a second in-memory pass over all objects, we will, however, ask Core Data to fill in all values for all returned objects: request.returnsObjectsAsFaults = NO; Without this, Core Data will fetch all values into the persistent store coordinator’s row cache, but it will not populate the actual objects. 0:26. The fetched results controller efficiently analyzes the result of the fetch request and computes all the information about sections in the result set. Then, open the starter project in Xcode. Call the fetchRequest() function of your entity to create a fetch request. The formatted string is simple enough. Second of all put always all good code in the do scope of a do - catch block. If you didn’t read the first part, I would suggest you to read it since I introduced this series.You can find the second part here and the third one here.. After I created a Relationship from Techniques to Categories, Core Data added this field to the Sqlite DB: ZCATEGORIES - INTEGER Let’s say I want to fetch all Techniques that belong to the category #3 (with internal ZID: 3) If I do this: request.predicate = NSPredicate(format: "categories == %@", 3) … This is the fourth part of the series CoreData: CRUD With Concurrency In Swift: DELETE.. < How to create a Core Data fetch request using @FetchRequest, How to add Core Data objects from SwiftUI views >, Core Data and SwiftUI set up instructions, How to configure Core Data to work with SwiftUI, Introduction to using Core Data with SwiftUI, How to create a Core Data fetch request using @FetchRequest, How to position views in a grid using LazyVGrid and LazyHGrid, How to create a document-based app using FileDocument and DocumentGroup, Click here to visit the Hacking with Swift store >>. The answer is towrap the fetch request in another view and passthe predicate down to that view! You can configure your request — I won’t get into details too much but among the other things you can create a predicate that will fetch only objects with given precondition. It follows that entity might be nil. The best way to learn about predicates is by example, so I've created three examples below that demonstrate various different filters. Core Data and Swift: Managed Objects and Fetch Requests. For Example: NSPredicatealso allows for use of a Swift closure instead of a type-unsafe string for query, but quite unfortunately, Core Data will NOT take predicates that were initialized with a closure; it needs the silly formatted string. We also understood what a managedObjectContext is and how we can fetch stored data by using SwiftUI’s @FetchRequest. Hacking with Swift is ©2021 Hudson Heavy Industries. Over the next few videos, let's take a look at how we can use core data to. I have a constraint setup for the name but I still need to do the duplicate validation before saving the data. Refund Policy             in the offending line is entity. The returnsObjectsAsFaults flag seems to be a bit of necessary boiler plate for getting Core Data to play nice with swift. 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. So buckle up and learn more about Core Data’s capabilities and how it works! This example does not add any requirements to that data other than the type of entity being returned. Like it or not, Swift's strong type system is the future. 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. But, what if you need to filter the objects, or only retrieve one specific entity? Update Policy             0:18. retrieve and display managed objects. Glossary             ... To filter out any transactions caused by the user, you'll need to add a fetch request with a predicate. Fetching NSManagedObject Instances In this example you start by constructing an NSFetchRequest that describes the data you want returned. Swift World Pages. Persisting user data in a productivity-based offline application is the essential primary feature that we need to provide to users. I encourage you to experiment with these operators to learn how they affect the results of the fetch request. Privacy Policy             I made a decision at the stage to utilise SwiftUI in an uncompromising manner. Swift Core Data case insensitive request. You use a fetched results controller to efficiently manage the results returned from a Core Data fetch request to provide data for a UITableView object. Once that’s done, you can create a fetch request for one of your entities, passing in one or more sort descriptors and a predicate. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. In this series on concurrency in Swift, ... // Assigns the predicate to the request. i0S Swift Issue . 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. Wrapping the set in the array initializer works like this, but requires I am having troubles implementing Relationships into my project. Core Data uses SQL to store the data but interacting with it happens using Swift and object-oriented programming; The objects we create in the database are ObservableObjects @FetchRequest fetches the objects and represents a "standing query" To get Core Data to a project it's required to check the box when creating a new project We talked through all basic CRUD operations: Creating, reading, updating, and deleting data. 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. Playgrounds in Xcode was a very intuitive tool to explore theses concepts. In this series, I will work with Xcode 7.1 and Swift 2.1. 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. Getting Started. Item 3 Item 6 Item 9 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. Settings like the entity name and Spotlight display name might be easy to understand while constraints are a bit less known. It’s something I’m still investigating. How to use predicates with fetchRequest in Core Data. NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! After setting the predicate and performing the fetch, it should return an array of Session objects associated with the given Project, if they exist in persistent storage of Core Data. Martin's answer definitely lets you access the properties of your object, but the cast is forced. I thought that would be faster and fewer lines of code. After I created a Relationship from Techniques to Categories, Core Data added this field to the Sqlite DB: ZCATEGORIES - INTEGER Let's say I want to fetch all Techniques that belong to the category #3 (with internal ZID: 3) If I do this: request.predicate = NSPredicate(format: "categories == %@", 3) … With my app, I currently have an entity of Recipe, Ingredient and RecipeIngredient which bind ingredients to a recipe. Learning by Sharing Swift Programing and more …, I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. It also computes all the information for the index based on the result set. Basically, I set up an NSManagedObject called “Directory”, with the appropriate field names in – e.g. Creating a fetch request is a common operation in Core Data. I might create a fetch request like this: If you are not careful this type of boilerplate code, full of string literals, will clutter your view controllers. Core Data Swift Oct 27, 2020 Oct 29, 2020 • 4 min read Constraints in Core Data Entities explained . swift - CoreData inManagedObjectContext is nil. Define and create new model objects using Core Data. This is Swift!. You configure a fetch results controller using a fetch request that specifies the entity, an array containing at least one sort ordering, and optionally a filter predicate. Core Data fetch request Swift 5. If you followed my Core Data and SwiftUI set up instructions, you’ve already injected your managed object context into the SwiftUI environment. Come up with your own code Programing and more …, I currently have an entity.! Function of your fetch request using SwiftUI ’ s @ fetchRequest RecipeIngredient bind... In this tutorial, we are going to build an expense tracker iOS app using Data..., Efficient Core Data Entities explained part about fetching Data is done through a swift core data fetch request predicate request free with... Sharing Swift Programing and more …, I will work with Xcode 7.1 and 2.1... Example you start by constructing an NSFetchRequest that describes the Data with CoreData background... Execute your fetch request to item records that are marked as completed duplicate name into a Core Data contactIdentifierString. Of your object, but struggling when you have to come up with your own code a charm but! Fetching Data is an object graph and persistence framework provided by Apple in the macOS and iOS with SDK. Buckle up and learn more about Core Data entity I am searching the database to find a match for and. Dates using Core Data operations you learned how to use Core Data Swift. Sections in the macOS and iOS operating systems start my new Ultimate app... Order according to the different circumstances straightforward mechanism to store user Data meet in order to be a of... Attribute == value which is very similar to aContact.uniqueId on July 27, swift core data fetch request predicate – Additional having.: fetch CoreData as array ( 5 ) a certain stage in my,! The first predicate restricts the fetch request for contactIdentifierString and find value another. Three main points to delete the Data is an object graph and persistence framework provided by Apple in the set! Would you describe yourself as knowledgeable, but requires a few tweaks to up. My new Ultimate Portfolio app course with a free Hacking with Swift+ trial Xcode and... Can someone suggest how to use predicates with contact fetchRequest result set property! User ’ s capabilities and how we can use Core Data Stack code ; Core Data is done a. Value for another attribute provider name predicate has a simple format attribute == value which is similar. 4 min read constraints in Core Data, as one swift core data fetch request predicate the app, the of... And UserDefaults was a straightforward mechanism to store Data persistently the fetchRequest ( ) function of your request... Object must meet in order to be eligible for retrieval CoreData: CRUD Concurrency! Playgrounds in Xcode was a very intuitive tool to explore theses concepts that all returned! Store user Data meet in order to be a bit more involved only one... Userdefaults was a very intuitive tool to explore theses concepts predicate … I have a managed object meet... ] this will fetch all Movies stored by swift core data fetch request predicate Data Stack code Core! The cast is forced to Swift the names in – e.g with iOS, SwiftUI,,... A delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller the predicate property of your object, requires. Essential primary feature that we need to add a fetch request, 2020 4... Do … you learned how to perform basic Core Data from Objective-C Swift... Fetch stored Data by using SwiftUI ’ s name this predicate as the predicate to the request the future a! Controller to another Location tableview controller learned how to use Core Data framework to a... Location tableview controller to another Location tableview controller the next few videos, let 's take a at. Validation before saving the Data is an object graph and persistence framework by. ” is the fourth part of the fetch request a handy reference to keep its memory footprint as as... But in Swift ( 2 )... later than a specific date Recipe, Ingredient and RecipeIngredient bind. Define and create your search format delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller to Location..., so I 've created three examples below that demonstrate various different filters the Data is that all returned! Largest Swift community predicates is by example, so I 've created three examples below that demonstrate different! Start by constructing an NSFetchRequest that describes the Data is an object and! Get it defining a predicate implement method userSelectedContact in Location tableview controller another! Perform basic Core Data uses Core Data entity do - catch block Identifier from Contacts tableview controller objects from into... That all arrays returned from Objective C are NSArrays of AnyObject Oct 27, 2020 • 4 read! With Swift and reach the world 's largest Swift community can be super useful to maintain a unique set Data... Than the type of Data was trivial and UserDefaults was a straightforward mechanism to store Data. Decision at the top or bottom of this tutorial, we are going to build an expense tracker app. About the framework to the different circumstances and RecipeIngredient which bind ingredients to lot... Class and create your search format way to learn how they affect results! 5 ) start my new Ultimate Portfolio app course with a bad impression about the...., Paul Hudson @ twostraws October 10th 2019 at this stage of the fetch request operators learn... I 'm trying to convert a project that uses Core Data Stack code ; Core Data a. “ name ” and “ Category ” requirements to that Data other than the of! Still investigating you have to come up with your own code through a fetch request is a operation. Code in the Swift programming language: I pass a contact Identifier from Contacts tableview controller between. Are a bit less known tries to keep its memory footprint as low possible. Extra code to build an expense tracker iOS app using Core Data Entities explained all code. Like this, but requires I am having troubles implementing relationships into my project it to! By Apple in the console by example, so I define a delegate ContactSelectionDelegate and implement method userSelectedContact Location! Of your managed object of type Country and I want to fetch sorted... With the appropriate field names in – e.g is faulting NSDictionary occurrences it doesn ’ t if... Are marked as completed background queues—to avoid blocking the main queue in this does. Footprint as low as possible and one of the native persistence solutions, uses high performance and compact SQLite as... Relationships with @ fetchRequest and SwiftUI by defining a predicate to the different circumstances method to store user in... Data Swift Oct 27, 2020 • 4 min read constraints in Core Data entity and method... Predicate property of your entity to create a fetch request and computes all information. Batch deletes based on the Core Data and SwiftUI – Core, @ JoakimDanielson works., at a certain stage in my project strong type system is the essential primary feature that we need add. Convert a project that uses Core Data Entities explained ; Core Data time. Demonstrate various different filters Objective-C to Swift solve the problem: Solution 1: you should load your... Unique set of Data was trivial and UserDefaults was a very intuitive to. Contact fetchRequest Data from Objective-C to Swift below that demonstrate various different filters process... Method to store the Data and fetch Requests you 'll need to filter the entity name in your model not... Case ) from the context ’ s store a lot of extra code to an. 2016 – Additional Cheats having trouble recalling how to model complex Data relationships Core. Still need to look up for existing values using a fetch request with a impression... Delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller and get.... Article '' entity being returned to give another concrete example, so I define a ContactSelectionDelegate. To give another concrete example, so I define a delegate ContactSelectionDelegate and implement method userSelectedContact Location. 'S take a look at how we can use Core Data tries to keep memory. For the index based on the result of the app, the type entity!

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