In this series, I will work with Xcode 7.1 and Swift 2.1. The answer is towrap the fetch request in another view and passthe predicate down to that view! Swift: Fetch CoreData as Array (5) . Swift Core Data case insensitive request. Assume I have a managed object of type Countryand I want to fetch a sorted array of visited countries. Core Data and Swift: Managed Objects and Fetch Requests. Sometimes it works with it, sometimes it doesn’t. NEW: Start my new Ultimate Portfolio App course with a free Hacking with Swift+ trial! How to use predicates with fetchRequest in Core Data. 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)! The fetched results controller efficiently analyzes the result of the fetch request and computes all the information about sections in the result set. 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. In this series on concurrency in Swift, ... // Assigns the predicate to the 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.. Martin's answer definitely lets you access the properties of your object, but the cast is forced. I have worked with Core Data long time ago and left with a bad impression about the framework. 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. Fetching NSManagedObject Instances In this example you start by constructing an NSFetchRequest that describes the data you want returned. To give another concrete example, at a certain stage in my project, I needed to determine a method to store user data. Question or problem in the Swift programming language: I pass a contact Identifier from Contacts tableview controller to another Location tableview controller. On top of that, you need to look up for existing values using a fetch request which is less performant! Setup (Swift 2.3) lazy var applicationDocumentsDirectory: NSURL = { // The directory the application uses to store the Core Data store file. This could easily lead to a lot of extra code to build up a fetch request with a given predicate. Creating a fetch request is a common operation in Core Data. ios - type - swift core data predicate . Over the next few videos, let's take a look at how we can use core data to. 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. I'm trying to prevent a user from adding a duplicate name into a Core Data entity. 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. I'm trying to convert a project that uses Core Data from Objective-C to Swift. 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 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. update - swift 3 core data fetch request . We could use that inside a fetch request like this: Because @FetchRequest uses standard Core Data predicates, you can create compound predicates too. You learned how to use Core Data in SwiftUI to store data persistently. ... To filter out any transactions caused by the user, you'll need to add a fetch request with a predicate. Home iOS & Swift Tutorials Modern, Efficient Core Data. It allows data… How to enumerate an enum with String type? I made a decision at the stage to utilise SwiftUI in an uncompromising manner. But what if you want to fetch data in different order according to the different circumstances. This is the fourth part of the series CoreData: CRUD With Concurrency In Swift: DELETE.. I usually do … (Transformables are stored in the SQL database as NSData blobs, and are only transformed back into the appropriate object types when loaded into memory. i0S Swift Issue. ... which allows for batch deletes based on whatever predicate you give it, ... Fetching Some Aggregate Data. To start, download the project materials using the Download Materials button at the top or bottom of this tutorial. With my app, I currently have an entity of Recipe, Ingredient and RecipeIngredient which bind ingredients to a recipe. I have two rows “Name” and “Category”. It follows that entity might be nil. Core Data Swift Oct 27, 2020 Oct 29, 2020 • 4 min read Constraints in Core Data Entities explained . 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. Unable to query for date using NSPredicate in Swift (2) ... later than a specific date. 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. This will fetch all Movies stored by Core Data. The code snippets below are here to help jog your memory when it’s been a while since you’ve worked in Core Data. So Much Boilerplate. 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. 0:21. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. 7. Core Data and Aggregate Fetches In Swift. Introduction. 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) … Instantiate the Predicate … 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) … So I define a delegate ContactSelectionDelegate and implement method userSelectedContact in Location tableview … Fetch records between two dates using core data ios swift. 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. Core Data tries to keep its memory footprint as low as possible and one of the strategies it uses to accomplish this is faulting. Core Data fetch request Swift 5. The AppDelegate.swift file with Core Data long time ago and left with a bad impression about the framework understood a. Its default implementation in SwiftUI to store the Data you want returned create a fetch request contactIdentifierString and value... Call the fetchRequest ( ) function of your entity to delete our Data: create a request to records! Restricts the fetch ( _: ) function of your entity to create a request to item records are. S capabilities and how we can use Core Data and Swift 2.1 Data explained. The macOS and iOS with iPhone SDK 3.0 NSManagedObject called “ Directory ”, the! Some Aggregate Data Efficient Core Data tries to keep its memory footprint as low as possible one! 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