core data constraints
But you may be wondering which option, or options, to use in your application. To help Core Data perform the migration, though, you may have to provide information about how to map from one version of the model to another. For example, CloudKit does not support unique constraints, undefined attributes or required relationships. For a simple data model with common constraints, the options the data model offers may be sufficient. If you'd like to use an Attribute to add Unique Keys to your Entity Framework Core … Apps that use Core Data can move to CloudKit as long as the persistent store is an NSSQLiteStoreType store, and the data model is compatible with CloudKit limitations. By convention, when targeting a relational database, foreign key constraints are named FK_
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