How do I delete a core data store?

you can simply delete the file: [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]; then use storeURL to add a new persistent store as usual. Your NSPersistentStoreCoordinator won’t complain if you have a new model and you won’t need any migrations, but your data will be lost, of course.

How do you delete an entity in core data?

3 Answers

1. Highlight the Entity that you want to delete.
2. Press the backspace (delete) key.

How do I delete all records from core data?

NSBatchDeleteRequest is used to delete records in core data. It works very fast and takes less time to delete all records from an entity. It requires NSFetchRequest in argument. If you want to delete all records from an entity, you can use it and it works for me.

What is delete rule in core data?

A delete rule defines what happens when the record that owns the relationship is deleted. A delete rule defines what happens when the record that owns the relationship is deleted. Select the notes relationship of the Category entity and open the Data Model Inspector on the right.

What is relationship in Core Data?

A relationship specifies the entity, or the parent entity, of the objects at the destination. This entity can be the same as the entity at the source (a reflexive relationship). To-one relationships are represented by a reference to the destination object, and to-many relationships are represented by mutable sets.

What is NSManagedObject in Core Data?

An NSManagedObject instance implements the basic behavior required of a Core Data model object. The entity description includes the name of the entity that the object represents and its attributes and relationships. The managed object context represents a scratch pad where you create the managed objects.

Is Core Data a database?

Core Data is not a database. Core Data is a framework for managing an object graph.

What is Core Data used for?

Core Data is a framework that you use to manage the model layer objects in your application. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence.

Where is Core Data stored?

The location that makes the most sense is the Documents directory. This directory is used to store data that is generated by the user and some of that data is most likely stored in the persistent store of your application.

Where is core data stored?

The persistent store should be located in the AppData > Library > Application Support directory. In this example you should see a SQLite database with extension . sqlite. It is possible that you don’t see the persistent store in the Application Support directory.

How to delete a managed object from core data?

If you run the application, the name of a random item record is printed to the console. To delete the item record, we invoke delete (_:) on the managed object context the item record belongs to, passing in the item record as an argument. Remember that every managed object is tied to a managed object context.

Is there a way to remove all core data files?

That recursively removes both the custom sub-directory and all of the Core Data files in it. This only works if you don’t already have your persistent store in the same folder as other, important data. Like the documents directory, which probably has other useful stuff in it.

How do you delete an object from a database?

Like saving data, we first grab the manage object context. The context provides a method called “deleteObject” that allows you to delete the specific object from database. Lastly, we invoke the “save” method to commit the change. Following the removal of the object from database, we also remove the record from the table view.

When to delete all entries in core data?

The programmatic way for iterating through each entity is both slower and prone to error. The use for doing it that way is if you want to delete some entities and not others. However you still need to make sure you retain referential integrity or you won’t be able to persist your changes.