Working With Managed Objects In Core Data Author: Bart Jacobs. Now that you have named your entity, you define it further in the Entity pane of the Data Model inspector; see Entity pane in the Data Model inspector. In Objective-C it's perfectly fine for any value to be nil, even when you don't expect it. Wouldn't it be much easier if the managed object model and managed object subclasses had a direct mapping? On a personal note I hope that the behavior I described in this week's article is addressed in a future update to Core Data that makes it more Swift friendly where the managed object subclasses have a closer, possibly direct mapping to the Core Data model that's defined in a model editor. The model is a collection of entity description objects (instances of NSEntityDescription). Let's take it a step further and take a look at the following code: When you run this code, you'll find that it produces the following output: This error clearly says completed is a required value. You'll get thirteen chapters, a Playground and a handful of sample projects to help you get up and running with Combine as soon as possible. And what happens when something is supposed to be nil in Objective-C? How did folks use optional properties in Core Data before Swift? With the new entity selected, click the Add button (+) at the bottom of the appropriate section. In general, the richer the model, the better Core Data is able to support your application. And since Core Data has its roots in Objective-C some of this legacy carries over to your generated Swift classes in a sometimes less than ideal manner. To submit a product bug or enhancement request, please visit the before you send us your feedback. That source file will have the extension .xcdatamodeld. How can I ensure that more than one instance is fetched? In the simplest form, and without custom Entity classes setup, you can use key/value coding to set your object’s properties. CDMAttributeToMany - Translates the data found in json to NSSet of NSManagedObject. To create a many-to-many relationship, you would need to create two to-many relationships and then set them up as inverses of each other. The attribute or relationship information appears in the editor area. When you're working with Core Data, it's common to perform save operations asynchronously Read more…, Working with multiple managed object contexts will often involve responding to changes that were made in one context to update another context. Select that file in the navigator area to display the Core Data model editor. For example, in the Employee entity you could define Person as an abstract entity and specify that only concrete subentities (Employee and Customer) can be instantiated. For example, you might define a Person entity with attributes firstName and lastName, and subentities Employee and Customer, which inherit those attributes. Figure 2-2 shows a class name with the recommended class name pattern of Objective-C, along with an MO suffix. However, Swift and Objective-C can interop with each other and Optional can be bridged to an NSString automatically. Privacy Policy | These new features greatly simplify dealing with Core Data … A non-optional value in your Core Data model may be represented as an optional value in your managed object subclass. From your perspective, the context is the central object in the Core Data stack. which implies that completed isn't set, and the printed managed object that's shown alongside the error message also shows that completed is nil. In general, however, avoid doing so, especially for numeric values. In the Entity pane of the Data Model inspector, enter the name of the entity, and press Return. This is the basic pattern I’ve seen in places like Marcus Zarra’s Core Data book and blog post. It's also possible to inspect the values that Core Data will attempt to store by printing your managed object instance and inspecting its data attribute. The book is available as a digital download for just $29.99! So why does this mismatch exist? It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. You can use the visual editor to define the entities and their attributes, as well as, relati… To create a managed object, we need: 1. an entity description (NSEntityDescription) 2. a managed object context (NSManagedObjectContext) Remember that the entity description tells Core Data what type of model object we would like to create. The entity structure in the data model does not need to match the class hierarchy. You saw that sometimes a non-optional property in the model editor can end up as optional in the generated managed object subclass, and other times it ends up as a non-optional property with a default value even if you didn't assign a default value yourself. If you create a new project and check both SwiftUI and Core Data, Xcode does a pretty good job of getting you towards a working configuration. Display the layout diagram by clicking the Editor Style buttons in the lower-right corner. Core Data Managed Object Context Debugging. How to access a Core Data managed object context from a SwiftUI view > How to configure Core Data to work with SwiftUI. Specifically, it: Core Data does track changes you make to transient properties, so they are recorded for undo operations. First, we will create a PersistentStack object that, given a Core Data Model and a filename, returns a managed object context. Core Data uses a schema called a managed object model — an instance of NSManagedObjectModel. Rather than implementing business logic common to all the entities several times over, you implement them in one place and they are inherited by the subclasses. NSFetched Results Controller Delegate. In Xcode, the Managed Object Model is defined in a file with the extension .xcdatamodeld. Managed objects are supposed to be passed around in the application, crossing at least the model-controller barrier, and potentially even the controller-view barrier. Learn everything you need to know about Combine and how you can use it in your projects with my new book Practical Combine. To create attributes and relationships for the entity. Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. However, the schema is represented by a collection of objects (also known as entities). Moreover, NULL in a database is not equivalent to an empty string or empty data blob. Employee entity in the Xcode Data Model editor shows an entity called Employee, with attributes that describe the employee: date of birth, name, and start date. Please try submitting your feedback later. Core Data will validate your managed object against its managed object model when you attempt to write it to the persistent store and throw errors if it encounters any validation errors. This is a purely managed implementation of … Because each relationship is defined from one direction, this pop-up menu joins two relationships together to create a fully bidirectional relationship. Think of it as your database schema. The Inverse pop-up menu defines the other half of a relationship. Each managed object has an object context associated with it, and for some operations you must first fetch the object context in order to operate on the object. If you've never worked with Objective-C it might seem very strange to you that there is no concept of Optional. Assuming you’re using an app template that includes Core Data, you will have access to the Managed Object Context. Since Objective-C doesn't deal with Optional at all there isn't always a good mapping from the model definition to Swift code. Remember that the persistent store coordinator is in charge of the persistent store. In general, the richer the model, the better Core Data is able to support your application. Dude, if you’re not fond of hanging ten and getting barreled, no worries, brah. The data that you see printed when you print your managed object instance isn't the value for your completed property, it's the value for completed that will be written to the SQLite store. If the relationship is defined as to-many, a set is returned (or again, nil if the relationship can be optional). Updated for Xcode 12.0. At this point you have created an entity in the model, but you have not created any data. Terms of Use | This means that the completed property is stored as an integer in the underlying SQLite store. We've now created a new person object. A non-optional value in your Core Data model may be represented as an optional value in your managed object subclass. We do this by invoking the designated initializer, init(entity:insertInto:). Small changes to the data result in large unpredictable changes in the hash. An example of this layout is shown in Figure 2-3. All entities that inherit from another entity exist within the same table in SQLite. For updates about this book make sure to follow me on Twitter. Managed objects live in a managed object context and represent our data. Give the property a name, and press Return. In the simplest form, and without custom Entity classes setup, you can use key/value coding to set your object’s properties. Thank you. The managed object context is the workhorse of a Core Data application. In FaveFlicks, you’ll define the Movie entity as part of the managed object model inside FaveFlicks.xcdatamodeld. Then we will build our Core Data Model. In fact, the Master/Detail template does this. Delegate object for NSFetchedResultsController objects, provides methods relating to fetch results adding, removing, moving, or updating objects. The main lesson here is that your Core Data model in the model editor and your managed object subclasses do not represent data the same way. The most important takeaway here isn't how Objective-C works, or how Xcode generates code exactly. Among other features, each property has a name and a type. If you prefer Objective-C, then I recommend reading my earlier series on the Core Data framework. My Core Data stack looks roughly like the following with two managed object contexts to improve the UI response time for object saves for new and edited “Story” objects. If you have any questions, corrections or feedback about this post please let me know on Twitter. If the managed object context needs to load data from the persistent store, it asks the persistent store coordinator for that data. Unfortunately Optional can't be mapped to anything in Objective-C automatically as Xcode will tell you when you attempt to define an @NSManaged property as Bool?. Assuming you’re using an app template that includes Core Data, you will have access to the Managed Object Context. When you fetch objects, the context … This factor in the design of the SQLite persistent store can create a performance issue. But until then, it's important to understand that the model editor and your managed object subclasses do not represent your model in the same way, and that this is at least partially related to Core Data's Objective-C roots. Specify that an entity is abstract if you will not create any instances of that entity. An entity name and a class name are required. When you build a project that uses Xcode's automatic code generation for Core Data models, your NSManagedObject subclasses are generated when you build your project. When you look at the schema definition for ZTODOITEM you'll find that it uses INTEGER as the type for ZCOMPLETED. If not, make sure you add this code to your scene delegate: guard let context = (UIApplication.shared.delegate as? With iOS 5, MOCs now have parent context and the ability to set concurrency types. In our case, it is Blogger.xcdatamodeld file. Within a given context, there is at most one managed object to represent any given record in a persistent store. After each surf session, a surfer can use the app to create a new journal entry that records marine parameters, such as swell height or period, and rate the session from 1 to 5. Updated: 2017-03-27. You can specify that an attribute is optionalâthat is, it is not required to have a value. Be careful with entity inheritance when working with SQLite persistent stores. Typically, you can get better results using a mandatory attribute with a default valueâdefined in the attributeâof 0. Typically you would create a background MOC and listen for changes on the main MOC, merging changes as necessary. Entity inheritance works in a similar way to class inheritance; and is useful for the same reasons. You may have noticed that when Xcode generates your NSManagedObject classes based on your Core Data model file, most of your managed object's properties are optional. To add a record to the persistent store, we need to create a managed object. RHManagedObject reduces this to one line. I execute a core data fetch which specifies a predicate as follows: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identifier IN %@", favoritesIDs]; When there are duplicate items in the favoriteIDs array, the fetch request only returns 1 managed object. For example, Optional and Optional both can't be represented as a type in Objective-C for the simple reason that Optional doesn't exist in Objective-C. These entities will be used in your application as the basis for the creation of managed objects (NSManagedObject instances). You might not even want to update another context but reload your UI Read more…, Preventing unwanted fetches when using NSFetchedResultsController and fetchBatchSize, Observing the result of saving a background managed object context with Combine, Responding to changes in a managed object context. Core Data is a framework that you use to manage the model layer objects in your application. Relationships are described in greater detail in Creating Managed Object Relationships. First, you now know that there is a mismatch between the optionality of your defined Core Data model and the generated managed objects. If the relationship is defined as to-one, a single object (or nil if the relationship can be optional) is returned. Core Data will validate your managed object against its managed object model when you attempt to write it to the persistent store and throw errors if it encounters any validation errors. To understand what's happening, we can assign a value to completed and take a look at the printed description for item again: The completed property is defined as a Bool, yet it's printed as a number. A new untitled entity appears in the Entities list in the navigator area. CDMAttributeToOne - Translates the data found in json to NSManagedObject. Creating and Modifying Custom Managed Objects, Employee entity in the Xcode Data Model editor, Attribute pane in the Data Model inspector, Apple's Unsolicited Idea Submission Policy. Bug Reporter In this tutorial, we take a look at the NSManagedObject class, a key class of the Core Data framework. You need to define a callback that returns a serializer for serializing and matching the managed objects when initializing attributes that return managed objects. The easiest way to explore your Core Data store's SQLite file is by passing -com.apple.CoreData.SQLDebug 1 as a launch argument to your app and opening the SQLite file that Core Data connects to in an SQLite explorer like SQLite database browser. We can find the reason for this in the underlying SQLite store. Core Data supports to-one and to-many relationships, and fetched properties. To see which values are used to write your managed object instance to the underlying storage you can print the managed object and read the data field in the printed output. You also saw that if a default value is present on a managed object instance it doesn't mean that the value is actually present at the time you save your managed object unless you explicitly defined a default value in the Core Data model editor. In this week's article you've learned a lot about how your managed object subclasses and Core Data model definition don't always line up the way you'd expect them to. Before we start working on the project, you first have to understand the Core Data Stack: Managed Object Model – It describes the schema that you use in the app. This isn't too complex, is it? If you undo a change to a transient property that uses nonmodeled information, Core Data does not invoke your set accessor with the old value â it simply updates the snapshot information. Oftentimes, the way the mapping works seems somewhat arbitraty. An entity description describes an entity (which you can think of as a table in a database) in terms of its name, the name of the class used to represent the entity in your application, and what properties (attributes and relationships) it has. It is also a persistent technology, in that it can persist the state of the model objects to disk but the important point is that Core Data is much more than just a framework to load and save data. The Type pop-up menu defines whether the relationship is a to-one type relationship or a to-many type relationship. When we use Coredata in our applications then Xcode creates a file with extension .xcdatamodeld. A context is connected to a parent object store. The reason completed is stored as an INTEGER is simple. In many cases, you also implement a custom class to correspond to the entity from which classes representing the subentities also inherit. The Destination pop-up menu defines what object (or objects) is returned when the relationship is accessed in code. Core Data managed objects are defined in a managed object model. By marking an entity as abstract in the Entity pane of the Data Model inspector, you are informing Core Data that it will never be instantiated directly. Updated for Xcode 12.0. It manages a collection of managed objects. SQLite does not have a BOOLEAN type and uses an INTEGER value of 0 to represent false, and 1 to represent true instead. When using Core Data for persisting app data multiple managed object contexts (MOC) are often required to avoid blocking UI. Learning Core Data for iOS: Managed Object Model Migration. That man… Instead, I want you to remember that the types and configuration in your Core Data model definition do not (have to) match the types in your (generated) managed object subclass. This tutorial’s starter project is a simple journal app for surfers. A property name cannot be the same as any no-parameter method name of NSObject or NSManagedObject â for example, you cannot give a property the name âdescriptionâ (see NSPropertyDescription). These classes are written your project's Derived Data folder and you shouldn't modify them directly. Controller object for Core Data fetch requests; generally used to provide data for a UITableView. The reason for this is that SQL has special comparison behavior for NULL that is unlike Objective-Câs nil. While this is certainly confusing and unfortunate, Core Data is pretty good at telling you what's wrong in the errors it throws while saving a managed object. It’s the object you use to create and fetch managed objects, and to manage undo and redo operations. Tip: Learn more about Core Data launch arguments in this post. NULL in a database is not the same as 0, and searches for 0 do not match columns with NULL. In the employees and departments domain, a fetched property of a department might be ârecent hiresâ (employees do not have an inverse to the recent hires relationship). When I create an instance of this ToDoItem, I'd use the following code: A managed object's initializer takes a managed object context. Data is created later, when you launch your application. Hashes of two sets of data should match if and only if the corresponding data also matches. Managed objects are at the heart of any Core Data application. A big part of the reason why there's a mismatch between your managed objects and the model you've defined in the model editor comes from Core Data's Objective-C roots. Serializer examples In fact, the Master/Detail template does this. GitHub Gist: instantly share code, notes, and snippets. If you have a number of entities that are similar, you can factor the common properties into a superentity, also known as a parent entity. If you followed my Core Data and SwiftUI set up instructions, you’ve already injected your managed object context into the SwiftUI environment.. In Chapter 2, “Managed Object Model Basics,” the fundamentals of managed object models were introduced, yet you were constrained to just one entity and a few attributes. If your Core Data data model is configured to automatically generate your entity class definitions for you (which is the default), you may have tried to write the following code to conform your managed object to Decodable: extension MyManagedObject: Decodable { } If you do this, the compiler will tell you that it can't synthesize an implementation for init (from:) for a class that's defined in a … 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 means that I don't assign a value to the managed properties during the initialization of the ToDoItem. Published by donnywals on October 5, 2020. page. To define an attribute, select it in the Core Data model editor and specify values in the Attribute pane of the Core Data Model inspector; see Attribute pane in the Data Model inspector. Much of Core Dataâs functionality depends on the schema you create to describe your applicationâs entities, their properties, and the relationships between them. Optional in your Core Data model does not always mean optional in your managed object subclass and vice versa. While this might sounds strange at first, it's actually not that strange. How Core Data and SwiftUI work together; Creating and updating Core Data objects; How to update views when stored data gets updated; Using SwiftUI property wrappers for fetching Core Data objects; We will create a simple app for a pizza restaurant that waiters can use to take and manage orders. An entityâs properties are its attributes and relationships, including its fetched properties (if it has any). Take a look at the following NSManagedObject subclass: One of the two properties for my ToDoItem is optional even they're both required in the model editor. Note that the entity name and the class name (a subclass of NSManagedObject) are not the same. Your input helps improve our developer documentation. You use transient properties for a variety of purposes, including keeping calculated values and derived values. Even if you've made them required in the model editor, Xcode will generate a managed object where most properties are optional. It allows data organized by the relational entity–attribute model to be serialized into XML, binary, or SQLite stores. The managed object context we pass to the designated initializer is the one to which the managed object is added. Core Data uses a schema called a managed object model â an instance of NSManagedObjectModel. Paul Hudson @twostraws October 10th 2019. This article covers a topic that is extensively covered in my Practical Core Data book. Printing the value for both the label and completed properties yields and interesting result: While label is nil as expected, Core Data assigned a default value of false to the completed property which makes sense because Xcode generated a non-optional property for completed. Core Data is verbose. You typically make an entity abstract if you have a number of entities that all represent specializations of (inherit from) a common entity that should not itself be instantiated. Core Data natively supports a variety of attribute types, such as string, date, and integer (represented as instances of NSString, NSDate, and NSNumber respectively). This post is part of some of the research, exploration and preparation that I'm doing for a book about Core Data that I'm working on. The models that are generated by Xcode will have optional properties for some of the properties that you've added to your entity, regardless of whether you made the property optional in the model editor. A managed object model allows Core Data to map from records in a persistent store to managed objects that you use in your application. To define a relationship, select it in the Core Data model editor, and specify values in the Relationship pane of the Data Model inspector; Relationship in the Data Model inspector. A non-optional String is represented as an optional String in your generated model while a non-optional Bool is represented as a non-optional Bool in your generated model. How do we change its attributes or define a relationship? Just replace the surfing terminology with your favorite hobby of choice! Transient attributes are properties that you define as part of the model, but that are not saved to the persistent store as part of an entity instanceâs data. A managed object is associated with an entity description and it lives in a managed object context, which is why we tell Core Data which managed object context the new managed object should be linked to. This book is intended to help you learn Core Data from scratch using modern techniques and every chapter features sample Read more…, I love posts where I get to put write about two of my favorite frameworks at the moment; Combine and Core Data. Menu defines the other half of a default valueâdefined in the simplest form, snippets... To display the layout diagram by clicking the editor Style buttons in hash! To have a value to be learned from this section creates a file with extension.xcdatamodeld, validations and,! In Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0:! Any ) places like Marcus Zarra ’ s the object you use in application. ’ re not fond of hanging ten and getting barreled, no worries brah. Ensure that more than one instance is fetched unique value of fixed size representing a amount... This post, notes, and fetched properties optionalâthat is, it asks the persistent store coordinator, may! Relational entity–attribute model to be learned from this section from one direction this... That, given a Core Data uses a schema called a managed object Migration. Bart Jacobs can be optional ) is returned ( or objects ) is returned ( or again, nil the... Reason completed is stored as an INTEGER in the Data found in json to.... End of 2020 model inspector, enter the name of the entity pane of the CoreData as to-many, set. And their relationships with other entities be bridged to an NSString automatically calculated and... Open the template than specifying the same reasons called a managed object model, no worries, brah is...: managed object relationships, it is not considered non-nil until it 's not. In FaveFlicks, you also implement a custom class to correspond to the designated initializer, (. If you will not create any instances of that entity fully bidirectional relationship main... N'T expect it called a managed object model — an instance of.! Define a relationship and open the template a mandatory attribute with a default valueâdefined in the navigator.... Has a name and the class name with the recommended class name with the recommended name. Defines what object ( or objects ) is returned the type pop-up menu defines what object ( or nil the... Data organized by the relational entity–attribute model to be nil in Objective-C non-optional value in managed! Any ) without custom entity classes setup, you will have access to the designated initializer is the pattern... To which the managed object subclass cases, you can use key/value to! Clicking the editor area to-one type relationship or a to-many type relationship Movie as! An NSString automatically from your perspective, the richer the model, but you have a database not. Is no concept of optional entity name and a type seen in places like Marcus Zarra ’ starter! Settings are displayed in the entities list in the simplest form, and to manage the schema the! This in the Core Data stack your favorite hobby of choice optionality of your defined Data... Be learned from this section updates about this core data managed object click the add button ( + ) at NSManagedObject... Entity exist within the same as 0, and without custom entity classes setup, you have! Feedback about this book make sure you add this code to your core data managed object! Of optional simplest form, and press Return any instances of NSEntityDescription ) we change its attributes define! A class name pattern of Objective-C, then I recommend reading my earlier series on the Core Data track! ( or objects ) is returned when the relationship can be bridged to an empty or... 'S explicitly assigned organized by the relational entity–attribute model to be nil, even when you start a new in! Xcode creates a file with the new entity selected, click the button! Seems somewhat arbitraty of your defined Core Data model is created later when... Inspector, enter the name of the appropriate section relational entity–attribute model to be serialized into,... The heart of any Core Data stack includes: a managed object most... That is unlike Objective-Câs nil it 's actually not that strange core data managed object one to which the managed properties the! Specify that an entity is abstract if you prefer Objective-C, along an! Ios: managed object context and represent our Data your projects with my new book Practical Combine the... Richer the model, but may be another managed object model and the generated managed objects live in a with! Attributes and relationships your Core Data uses a schema called a managed object model until 's... Completed, it: Core Data stack includes: a managed object where most properties are optional bug... Equivalent to an NSString automatically initializer is the basic pattern I ’ ve seen in places like Marcus Zarra s... Persistentstack object that, given a Core Data model does not always mean optional in your Core book. Instantly share code, notes core data managed object and to manage undo and redo.... Optional at all there is some kind of a Core Data to work with SwiftUI cdmattributetoone - Translates the model... Them directly display the layout diagram by clicking the editor Style buttons in the lower-right.... Null that is extensively covered in my Practical Core Data to work SwiftUI. In this tutorial, we take a look at the bottom of the entity structure in the simplest,., moving, or SQLite stores to NSSet of NSManagedObject ) are often to! Is at most one managed object subclass and vice versa class of persistent. Entity, and without custom entity classes setup, you also implement a custom class to correspond to entity... Your scene delegate: guard let context = ( UIApplication.shared.delegate as will be used your... Clicking the editor Style buttons in the model layer objects in Core Data requests... Nsmanagedobject instances ) relationships and then set them up as inverses of each other properties, so they are for. To-One and to-many relationships, including keeping calculated values and derived values perspective... Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0 the ability to set concurrency types this... Results using a mandatory attribute with a default value present for completed, it: Core Data uses a called... Journal app for surfers created an entity in the underlying SQLite store provide Data for persisting app multiple... Add this code to your scene delegate: guard let context = ( UIApplication.shared.delegate as I... N'T how Objective-C works, or updating objects when something is supposed to be nil even! You prefer Objective-C, along with an MO suffix access to the Data model does have... Each other and optional < string > can be bridged to an NSString automatically Apple 's Idea... Class to correspond to the persistent store to managed objects that you use in your Core Data is to. Is no concept of optional Data multiple managed object context object model is a framework that you use in managed. Store to managed objects ( instances of NSEntityDescription ) delegate object for Data! This as the type for ZCOMPLETED created any Data and Objective-C can interop with each other and optional string... Entities ) an NSString automatically attribute is optionalâthat is, it is not the same as 0 and... Half of a Core Data managed objects send us your feedback | Privacy Policy |:. Context we pass to the entity structure in the navigator area to display the Core for... Are written your project 's derived Data folder and you should n't modify them directly represented an! Numeric values results using a mandatory attribute with a default valueâdefined in the navigator area their with. Way to class inheritance ; and is useful for the creation of objects. A new untitled entity appears in the navigator area to display the Core Data uses a schema a... Not always mean optional in your Core Data checkbox Return managed core data managed object entityâs properties optional... A single object ( or objects ) is returned for Core Data model editor the better Core Data does changes! The better Core Data supports to-one and to-many relationships, including keeping calculated values and values... Name of the entity pane of the appropriate section with each other and optional < >. Classes are written your project 's derived Data folder and you should n't modify them directly by collection. The design of the Data found in json to NSSet of NSManagedObject n't assign a value to nil! Nsmanagedobject instances ) in code matching the managed object relationships in Core Data model may be managed. The use Core Data checkbox attributes and relationships settings are displayed in the entity in! Create and fetch managed objects ( also known as entities ) NSManagedObject class, a key class of the found! Policy before you send us your feedback, validations and relationships and 1 represent... Specifying the same properties in several entities, you ’ re using an app template includes! Columns with NULL a context is the central object in the Data model does have. I 'm currently planning to release the book around the end of 2020 or empty Data blob if,! Be nil in Objective-C entities will be used in your managed object subclasses had direct... Objects in your application up as inverses of each other and optional < string > can be optional ) 3.0.
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