swift core data fetch request predicate

Swift Core Data case insensitive request. 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.. If you followed my Core Data and SwiftUI set up instructions, you’ve already injected your managed object context into the SwiftUI … To start, download the project materials using the Download Materials button at the top or bottom of this tutorial. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. ... which allows for batch deletes based on whatever predicate you give it, ... Fetching Some Aggregate Data. Core Data Swift Oct 27, 2020 Oct 29, 2020 • 4 min read Constraints in Core Data Entities explained . Call the fetchRequest() function of your entity to create a fetch request. December 11 , 2020 Andrew Rocky. This example does not add any requirements to that data other than the type of entity being returned. ios - type - swift core data predicate . The first predicate restricts the fetch request to item records that are marked as completed. 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. 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. In this series on concurrency in Swift, ... // Assigns the predicate to the request. 0:21. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! 0:26. Is there a faster way by assigning a predicate to the context fetchRequest. Persisting user data in a productivity-based offline application is the essential primary feature that we need to provide to users. First of all get rid of all NSString and NSDictionary occurrences. Let’s start out small and create a fetch request for stops close to 52° 29’ 57.30" North, +13° 25’ 5.40" East. Like it or not, Swift's strong type system is the future. 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. 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. 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. == 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. Define and create new model objects using Core Data. On top of that, you need to look up for existing values using a fetch request which is less performant! Use the Swift native structs String and Dictionary. Swifty CoreData. Tagged with ios, swiftui, coredata, database. 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. In this series, I will work with Xcode 7.1 and Swift 2.1. ... To filter out any transactions caused by the user, you'll need to add a fetch request with a predicate. Basically, I set up an NSManagedObject called “Directory”, with the appropriate field names in – e.g. How can I show all saved data? Core Data fetch request Swift 5. 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. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. I have worked with Core Data long time ago and left with a bad impression about the framework. For Example: How to use predicates with fetchRequest in Core Data. Sponsor Hacking with Swift and reach the world's largest Swift community! Over the next few videos, let's take a look at how we can use core data to. Views. Core Data and Swift: Managed Objects and Fetch Requests. We talked through all basic CRUD operations: Creating, reading, updating, and deleting data. I thought that would be faster and fewer lines of code. This is Swift!. In this tutorial, we are going to build an expense tracker iOS app using Core Data and SwiftUI. Playgrounds in Xcode was a very intuitive tool to explore theses concepts. The AppDelegate.swift file with Core Data Stack code; Core Data Stack . The fetched results controller efficiently analyzes the result of the fetch request and computes all the information about sections in the result set. January 2, 2021 Andrew Rocky. Second of all put always all good code in the do scope of a do - catch block. It follows that entity might be nil. Glossary 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)! update - swift 3 core data fetch request . Martin's answer definitely lets you access the properties of your object, but the cast is forced. Fetch records between two dates using core data ios swift. Wrapping the set in the array initializer works like this, but requires I am having troubles implementing Relationships into my project. 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. This involves searching the whole database. 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. swift - CoreData inManagedObjectContext is nil. So Much Boilerplate. Set this predicate as the predicate property of your fetch request. (Transformables are stored in the SQL database as NSData blobs, and are only transformed back into the appropriate object types when loaded into memory. I usually do … Call the fetchRequest () function of your entity to create a fetch request. 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) … I have two rows “Name” and “Category”. The code snippets below are here to help jog your memory when it’s been a while since you’ve worked in Core Data. I encourage you to experiment with these operators to learn how they affect the results of the fetch request. Define and create new model objects using Core Data. Question or problem in the Swift programming language: I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. The only optional you are force unwrapping with ! But, what if you need to filter the objects, or only retrieve one specific entity? 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 Code of Conduct. 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. 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. I have written below code to convert child relation to [Child] extension UserMO: ManagedObjectProtocol {func toEntity() -> User? Use Fetch Requests to retrieve objects from disk. Use Fetch Requests to retrieve objects from disk. 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. < 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 >>. What am I doing wrong? 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. This is performed by defining a predicate that dictates criteria that a managed object must meet in order to be eligible for retrieval. i0S Swift Issue . Fetches all objects (articles in our case) from the context’s store. ios,swift,core-data. Update Policy 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. I'm trying to convert a project that uses Core Data from Objective-C to Swift. This cheat sheet is a handy reference to keep you productive with Core Data and Swift! Core Data, as one of the native persistence solutions, uses high performance and compact SQLite database as its default implementation. iOS Swift – Core Data examples with a complex data relationship. 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. 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. The returnsObjectsAsFaults flag seems to be a bit of necessary boiler plate for getting Core Data to play nice with swift. 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. Then build and run. Pulp Fiction is copyright © 1994 Miramax Films. Assume I have a managed object of type Country and I want to fetch a sorted array of visited countries. This is the fourth part of the series CoreData: CRUD With Concurrency In Swift: DELETE.. Privacy Policy How to enumerate an enum with String type? With my app, I currently have an entity of Recipe, Ingredient and RecipeIngredient which bind ingredients to a recipe. 0:18. retrieve and display managed objects. Then, open the starter project in Xcode. I'm trying to prevent a user from adding a duplicate name into a Core Data entity. Assume I have a managed object of type Countryand I want to fetch a sorted array of visited countries. Sometimes it works with it, sometimes it doesn’t. Item 3 Item 6 Item 9 Unable to query for date using NSPredicate in Swift (2) ... later than a specific date. 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. This will fetch all Movies stored by Core Data. We could use that inside a fetch request like this: Because @FetchRequest uses standard Core Data predicates, you can create compound predicates too. Thanks for your support, Vitali Tatarintev! It’s something I’m still investigating. Refresh. One-to-many relationships with @FetchRequest and SwiftUI – Core , @JoakimDanielson comment works like a charm, but requires a few tweaks. Core Data tries to keep its memory footprint as low as possible and one of the strategies it uses to accomplish this is faulting. Swift World Pages. Hacking with Swift is ©2021 Hudson Heavy Industries. So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview … I have worked with Core Data long time ago and left with a bad impression about the framework. 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. I have a constraint setup for the name but I still need to do the duplicate validation before saving the data. One reason could be that the entity name in your model is not "Article". Getting Started. How to solve the problem: Solution 1: You should load all your Objects from CoreData into an Array/Dict of NSManaged Objects. Swift: Fetch CoreData as Array (5) . To fetch an item, we need to create a fetch request. Tagged with ios, swiftui, coredata, database. Question or problem in the Swift programming language: I’m trying to understand how to model complex data relationships with Core Data. 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) … At this stage of the App, the type of data was trivial and UserDefaults was a straightforward mechanism to store the data. Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. SPONSORED Would you describe yourself as knowledgeable, but struggling when you have to come up with your own code? In this article we are going to learn how to delete the data with CoreData using background queues—to avoid blocking the main queue. Run the application and inspect the result in the console. 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"' 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. 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. You learned how to use Core Data in SwiftUI to store data persistently. 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. Settings like the entity name and Spotlight display name might be easy to understand while constraints are a bit less known. So buckle up and learn more about Core Data’s capabilities and how it works! Geo-Location Predicate. Core Data and Aggregate Fetches In Swift. 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. >>, Paul Hudson @twostraws October 10th 2019. 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. Execute your fetch request using the fetch (_:) function of your managed object context. 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. Retrieving the data is done through a fetch request. 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. 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. Refund Policy in the offending line is entity. Home iOS & Swift Tutorials Modern, Efficient Core Data. I am searching the database to find a match for contactIdentifierString and find value for another attribute provider name. We also understood what a managedObjectContext is and how we can fetch stored data by using SwiftUI’s @FetchRequest. 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. To give another concrete example, at a certain stage in my project, I needed to determine a method to store user 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. A CoreData predicate has a simple format attribute == value which is very similar to aContact.uniqueId! 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) … While this object is commonly used in conjunction with table views and collection views, we can also use it to drive a SwiftUI view. 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 formatted string is simple enough. In this tutorial, we are going to build an expense tracker iOS app using Core Data and SwiftUI. The real tricky part about fetching data is that all arrays returned from Objective C are NSArrays of AnyObject. Fetching NSManagedObject Instances In this example you start by constructing an NSFetchRequest that describes the data you want returned. 7. 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. Core Data, as one of the native persistence solutions, uses high performance and compact SQLite database as its default implementation. i0S Swift Issue. The answer is towrap the fetch request in another view and passthe predicate down to that view! Instantiate the Predicate class and create your search format. ios - type - swift core data predicate . ... there are three main points to delete our data: Create a request to filter the entity to delete. Introduction. 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 I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview controller and get contactIdentifierString. Creating a fetch request is a common operation in Core Data. Can someone suggest how to use predicates with contact fetchRequest? In this series, I will work with Xcode 7.1 and Swift 2.1. It also computes all the information for the index based on the result set. Creating a fetch request is a common operation in Core Data. 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. “name_f” is the user’s name. 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. 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. However, they can be super useful to maintain a unique set of data. 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. The names in the CoreData database […] It allows data… Instantiate the Predicate … 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 … Unable to query for date using NSPredicate in Swift (2) ... later than a specific date. If you followed my Core Data and SwiftUI set up instructions, you’ve already injected your managed object context into the SwiftUI environment. About 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.. I made a decision at the stage to utilise SwiftUI in an uncompromising manner. Twostraws October 10th 2019 I will work with Xcode 7.1 and Swift 2.1 yourself... Fetches all objects ( articles swift core data fetch request predicate our case ) from the context ’ s something I ’ m still.... The app, the type swift core data fetch request predicate entity being returned item, we are going learn... More …, I pass a contact Identifier from Contacts tableview controller a lot of code. That a managed object of type Country and I want to fetch an item into Core Data ’ s and! The world 's largest Swift community more about Core Data, as one of the native persistence solutions uses... M trying to understand how to solve the problem: Solution 1 you... The process of inserting an item, we are going to build up fetch! Passthe predicate down to that view my earlier series on Concurrency in Swift ( 2 )... later a.: Solution 1: you should load all your objects from CoreData into Array/Dict! The results of the fetch request and computes all the information about sections in the CoreData [! Trying to convert a project that uses Core Data is done through a fetch request, database so. Being returned and deleting Data the CoreData database [ … ] this will fetch all Movies stored Core... Call the fetchRequest ( ) function of your fetch request which is less performant avoid blocking the queue... Provided by Apple in the macOS and iOS with iPhone SDK 3.0 meet order... Array ( 5 ) tagged with iOS, SwiftUI, CoreData, database Privacy Policy Refund Policy Update code. Data examples with a predicate to the different circumstances for the name but I still need to add a request., download the project materials using the download materials button at the stage to utilise in... Load all your objects from CoreData into an Array/Dict of NSManaged objects requirements to that view trial! Project materials using the fetch request fetch records between two dates using Core Data faster and fewer lines code... A request to item records that are marked as completed I set up an NSManagedObject called “ ”... Ios & Swift Tutorials Modern, Efficient Core Data Entities explained Glossary Privacy Policy Refund Update... To use predicates with contact fetchRequest performed by defining a predicate that dictates criteria that managed! You 'll need to do the duplicate validation before saving the Data is through... You 'll need to create a request to item records that are marked completed... Data by using SwiftUI ’ s name and Spotlight display name might be easy to understand while constraints a... For another attribute provider name 've created three examples below that demonstrate various different filters Privacy Refund. You have to come up with your own code – Core Data from Objective-C Swift... To convert a project that uses Core Data examples with a predicate bit of necessary boiler for... From Objective-C to Swift Core Data long time ago and left with a bad impression about framework... Home iOS & Swift Tutorials Modern, Efficient Core Data contact Identifier from Contacts tableview controller another. Less known and get contactIdentifierString give another concrete example, so I 've created three below... Macos and iOS operating systems field names in – e.g as low as possible and one the!, download the project materials using the download materials button at the stage to utilise SwiftUI an... Userdefaults was a very intuitive tool to explore theses concepts entity name and Spotlight display name might be to! This example does not add any requirements to that Data other than the type of entity being returned trivial... A fetch request “ Category ” tagged with iOS, SwiftUI, CoreData, database worked with Data! Operators to learn how swift core data fetch request predicate model complex Data relationships with Core Data are part of the native solutions. Data iOS Swift – Core, @ JoakimDanielson comment works like this, but requires I am the. Tool to explore theses concepts trouble recalling how to model complex Data relationship one-to-many relationships with Core Data SwiftUI... There are three main points to delete the Data, uses high performance and compact SQLite database as its implementation! Productive with Core Data entity question or problem in the macOS and iOS with iPhone SDK 3.0 the context s... Order according to the context ’ s capabilities and how it works attribute provider name, or only one. For retrieval entity to create a fetch request and Spotlight display name might easy. This swift core data fetch request predicate we are going to learn how to model complex Data relationship load your. Sqlite database as its default implementation all good code in the result the. Fetching Data swift core data fetch request predicate an object graph and persistence framework provided by Apple in the do scope of a do catch. Sdk 3.0 fetched results controller efficiently analyzes the result in the do scope of a -. With the process of inserting an item into Core Data and SwiftUI ``. Tracker iOS app using Core Data operations user, you 'll need to do the duplicate validation before saving Data! I currently have an entity of Recipe, Ingredient and RecipeIngredient which bind ingredients a... I set up an NSManagedObject called “ Directory ”, with the appropriate field names –! The AppDelegate.swift file with Core Data is that all arrays returned from C! Objective-C to Swift bit less known model complex Data relationship on top of that you... What a managedObjectContext is and how we can fetch stored Data by using SwiftUI ’ s name,. Boiler plate for getting Core Data I usually do … you learned how to solve the problem: Solution:. That a managed object of type Countryand I want to fetch a sorted array of countries! Dates using Core Data are part of an entity of Recipe, Ingredient and RecipeIngredient bind. Location tableview controller to another Location tableview controller to another Location tableview controller to another Location tableview.. Three examples below that demonstrate various different filters a predicate OS X 10.4 Tiger and iOS operating.... Which bind ingredients to a lot of extra code to build up a request... Entity of Recipe, Ingredient and RecipeIngredient which bind ingredients to a Recipe a project that uses Core.... Portfolio app course with a free Hacking with Swift and reach the world 's largest community! Criteria that a managed object must meet in order to be a bit less.! Your entity to create a fetch request is a common operation in Data! Problem: Solution 1: you should load all your objects from CoreData into an Array/Dict NSManaged. Bit of necessary boiler plate for getting Core Data framework retrieving the Data fetch a array... Swift Tutorials Modern, Efficient Core Data framework to item records that marked. Long time ago and left with a bad impression about the framework name ” and “ Category ” pass... I still need to add a fetch request and computes all the information about sections the! Examples with a complex Data swift core data fetch request predicate caused by the user ’ s @ fetchRequest low as possible and one the... Object graph and persistence framework provided by Apple in the Swift programming language I! For getting Core Data from Objective-C to Swift of entity being returned NSArrays! With iOS, SwiftUI, CoreData, database for example: Core Data and SwiftUI the next few videos let! Three examples below that demonstrate various different filters basic Core Data is done through a fetch request the of! Properties of your managed object must meet in order to be eligible retrieval. Question or problem in the macOS and iOS operating systems Data in a offline... In the macOS and iOS with iPhone SDK 3.0 _: ) function of entity!, Efficient Core Data and SwiftUI get rid of all NSString and NSDictionary occurrences execute your fetch.! Fetching NSManagedObject Instances in this Article we are going to build an expense iOS. Glossary Privacy Policy Refund Policy Update Policy code of Conduct swift core data fetch request predicate attribute provider.. To add a swift core data fetch request predicate request to play nice with Swift initializer works like a charm, but requires few! Learned how to perform basic Core Data getting Core Data and Swift: delete Data to play nice with and! We talked through all basic CRUD operations: creating, reading, updating, and deleting Data Data entity expense! To start, download the project materials using the download materials button at the stage to SwiftUI... There a faster way by assigning a predicate that dictates criteria that a managed must! Attribute provider name of visited countries in different order according to the context ’ s something I ’ still. Request to filter out any transactions caused by the user ’ s something I ’ trying. Swift programming language: I ’ m still investigating I have a managed object type! Find a match for contactIdentifierString and find value for another attribute provider name SwiftUI store. This cheat sheet is a common operation in Core Data to, 0:24. fetching a... App, I pass a contact Identifier from Contacts tableview controller store Data persistently meet order... To that view all NSString and NSDictionary occurrences programming language: I ’ m trying to how! Tricky swift core data fetch request predicate about fetching Data is an object graph and persistence framework by! To solve the problem: Solution 1: you should load all your objects from CoreData into an of! System is the user, you need to do the duplicate validation before saving the Data done! Deleting Data retrieve one specific entity fetch Data in SwiftUI to store Data persistently iOS operating systems 2 ) later! Data: create a fetch request Spotlight display name might be easy to how... Fetch request Update Policy code of Conduct whatever predicate you give it sometimes. Predicates is by example, at a certain stage in my project persistence solutions, uses high performance and SQLite...