オブジェクトモデルの変更 - Swift SDK

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
@interface Person : RLMObject
@property NSString *firstName;
@property NSString *lastName;
@property int age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"firstName", @"lastName", @"age"];
}
@end

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    @Persisted var age = 0
}

// In a new version, you add a property
// on the Person model.
@interface Person : RLMObject
@property NSString *firstName;
@property NSString *lastName;
// Add a new "email" property.
@property NSString *email;
// New properties can be migrated
// automatically, but must update the schema version.
@property int age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"firstName", @"lastName", @"email", @"age"];
}
@end

// In a new version, you add a property
// on the Person model.
class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    // Add a new "email" property.
    @Persisted var email: String?
    // New properties can be migrated
    // automatically, but must update the schema version.
    @Persisted var age = 0
}

// When you open the realm, specify that the schema
// is now using a newer version.
RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
// Set the new schema version
config.schemaVersion = 2;
// Use this configuration when opening realms
[RLMRealmConfiguration setDefaultConfiguration:config];
RLMRealm *realm = [RLMRealm defaultRealm];

// When you open the realm, specify that the schema
// is now using a newer version.
let config = Realm.Configuration(
    schemaVersion: 2)
// Use this configuration when opening realms
Realm.Configuration.defaultConfiguration = config
let realm = try! Realm()

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
@interface Person : RLMObject
@property NSString *firstName;
@property NSString *lastName;
@property int age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"firstName", @"lastName", @"age"];
}
@end

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    @Persisted var age = 0
}

// In a new version, you remove a property
// on the Person model.
@interface Person : RLMObject
@property NSString *firstName;
@property NSString *lastName;
// Remove the "age" property.
// @property int age;
// Removed properties can be migrated
// automatically, but must update the schema version.
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"firstName", @"lastName"];
}
@end

// In a new version, you remove a property
// on the Person model.
class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    // Remove the "age" property.
    // @Persisted var age = 0
    // Removed properties can be migrated
    // automatically, but must update the schema version.
}

// When you open the realm, specify that the schema
// is now using a newer version.
RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
// Set the new schema version
config.schemaVersion = 2;
// Use this configuration when opening realms
[RLMRealmConfiguration setDefaultConfiguration:config];
RLMRealm *realm = [RLMRealm defaultRealm];

// When you open the realm, specify that the schema
// is now using a newer version.
let config = Realm.Configuration(
    schemaVersion: 2)
// Use this configuration when opening realms
Realm.Configuration.defaultConfiguration = config
let realm = try! Realm()

RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
config.schemaVersion = 2;
config.migrationBlock = ^(RLMMigration * _Nonnull migration, uint64_t oldSchemaVersion) {
    if (oldSchemaVersion < 2) {
        // Rename the "age" property to "yearsSinceBirth".
        // The renaming operation should be done outside of calls to `enumerateObjects(ofType: _:)`.
        [migration renamePropertyForClass:[Person className] oldName:@"age" newName:@"yearsSinceBirth"];
    }
};

let config = Realm.Configuration(
    schemaVersion: 2,
    migrationBlock: { migration, oldSchemaVersion in
        if oldSchemaVersion < 2 {
            // Rename the "age" property to "yearsSinceBirth".
            // The renaming operation should be done outside of calls to `enumerateObjects(ofType: _:)`.
            migration.renameProperty(onType: Person.className(), from: "age", to: "yearsSinceBirth")
        }
    })

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
@interface Person : RLMObject
@property NSString *firstName;
@property NSString *lastName;
@property int age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"firstName", @"lastName", @"age"];
}
@end

// In the first version of the app, the Person model
// has separate fields for first and last names,
// and an age property.
class Person: Object {
    @Persisted var firstName = ""
    @Persisted var lastName = ""
    @Persisted var age = 0
}

// In version 2, the Person model has one
// combined field for the full name and age as a Int. 
// A manual migration will be required to convert from 
// version 1 to this version.
@interface Person : RLMObject
@property NSString *fullName;
@property int age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"fullName", @"age"];
}
@end

RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
// Set the new schema version
config.schemaVersion = 2;
config.migrationBlock = ^(RLMMigration * _Nonnull migration, uint64_t oldSchemaVersion) {
    if (oldSchemaVersion < 2) {
        // Iterate over every 'Person' object stored in the Realm file to
        // apply the migration
        [migration enumerateObjects:[Person className]
                            block:^(RLMObject * _Nullable oldObject, RLMObject * _Nullable newObject) {
            // Combine name fields into a single field
            newObject[@"fullName"] = [NSString stringWithFormat:@"%@ %@",
                                        oldObject[@"firstName"],
                                        oldObject[@"lastName"]];
        }];
    }
};
// Tell Realm to use this new configuration object for the default Realm
[RLMRealmConfiguration setDefaultConfiguration:config];
// Now that we've told Realm how to handle the schema change, opening the realm
// will automatically perform the migration
RLMRealm *realm = [RLMRealm defaultRealm];

// In version 2, the Person model has one
// combined field for the full name and age as a Int. 
// A manual migration will be required to convert from 
// version 1 to this version.
class Person: Object {
    @Persisted var fullName = ""
    @Persisted var age = 0
}

// In application(_:didFinishLaunchingWithOptions:)
let config = Realm.Configuration(
    schemaVersion: 2, // Set the new schema version.
    migrationBlock: { migration, oldSchemaVersion in
        if oldSchemaVersion < 2 {
            // The enumerateObjects(ofType:_:) method iterates over
            // every Person object stored in the Realm file to apply the migration
            migration.enumerateObjects(ofType: Person.className()) { oldObject, newObject in
                // combine name fields into a single field
                let firstName = oldObject!["firstName"] as? String
                let lastName = oldObject!["lastName"] as? String
                newObject!["fullName"] = "\(firstName!) \(lastName!)"
            }
        }
    }
)
// Tell Realm to use this new configuration object for the default Realm
Realm.Configuration.defaultConfiguration = config
// Now that we've told Realm how to handle the schema change, opening the file
// will automatically perform the migration
let realm = try! Realm()

// In version 3, the Person model has one
// combined field for the full name and age as a String. 
// A manual migration will be required to convert from 
// version 2 to this version.
@interface Person : RLMObject
@property NSString *fullName;
@property NSString *age;
@end
@implementation Person
+ (NSArray<NSString *> *)requiredProperties {
    return @[@"fullName", @"age"];
}
@end

RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
// Set the new schema version
config.schemaVersion = 3;
config.migrationBlock = ^(RLMMigration * _Nonnull migration, uint64_t oldSchemaVersion) {
    if (oldSchemaVersion < 2) {
        // Previous Migration.
        [migration enumerateObjects:[Person className]
                            block:^(RLMObject * _Nullable oldObject, RLMObject * _Nullable newObject) {
            newObject[@"fullName"] = [NSString stringWithFormat:@"%@ %@",
                                        oldObject[@"firstName"],
                                        oldObject[@"lastName"]];
        }];
    }
    if (oldSchemaVersion < 3) {
        // New Migration
        [migration enumerateObjects:[Person className]
                            block:^(RLMObject * _Nullable oldObject, RLMObject * _Nullable newObject) {
            // Make age a String instead of an Int
            newObject[@"age"] = [oldObject[@"age"] stringValue];
        }];
    }
};
// Tell Realm to use this new configuration object for the default Realm
[RLMRealmConfiguration setDefaultConfiguration:config];
// Now that we've told Realm how to handle the schema change, opening the realm
// will automatically perform the migration
RLMRealm *realm = [RLMRealm defaultRealm];

// In version 3, the Person model has one
// combined field for the full name and age as a String. 
// A manual migration will be required to convert from 
// version 2 to this version.
 class Person: Object {
    @Persisted var fullName = ""
    @Persisted var age = "0"
 }

// In application(_:didFinishLaunchingWithOptions:)
let config = Realm.Configuration(
    schemaVersion: 3, // Set the new schema version.
    migrationBlock: { migration, oldSchemaVersion in
        if oldSchemaVersion < 2 {
            // Previous Migration.
            migration.enumerateObjects(ofType: Person.className()) { oldObject, newObject in
                let firstName = oldObject!["firstName"] as? String
                let lastName = oldObject!["lastName"] as? String
                newObject!["fullName"] = "\(firstName!) \(lastName!)"
            }
        }
        if oldSchemaVersion < 3 {
            // New Migration.
            migration.enumerateObjects(ofType: Person.className()) { oldObject, newObject in
                // Make age a String instead of an Int
                newObject!["age"] = "\(oldObject!["age"] ?? 0)"
            }
        }
    }
)
// Tell Realm to use this new configuration object for the default Realm
Realm.Configuration.defaultConfiguration = config
// Now that we've told Realm how to handle the schema change, opening the file
// will automatically perform the migration
let realm = try! Realm()