title: Realm Migration doesn't work
body: <pre><code>    let config = Realm.Configuration(
          // Set the new schema version. This must be greater than the previously used
          // version (if you've never set a schema version before, the version is 0).
          schemaVersion: 1,
  
          // Set the block which will be called automatically when opening a Realm with
          // a schema version lower than the one set above
          migrationBlock: { migration, oldSchemaVersion in
              // We haven’t migrated anything yet, so oldSchemaVersion == 0
              if (oldSchemaVersion &lt; 1) {
                  // Nothing to do!
                  // Realm will automatically detect new properties and removed properties
                  // And will update the schema on disk automatically
              }
      })
  
      // 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()
  </code></pre>
  
  <p>This was put in application(application:didFinishLaunchingWithOptions:)</p>
  
  <p>In my test program, I have changed the fields in my object. I would like to remove everything in the database, and move to the new field types. I've copied the code above from the documentation, but it appears to do nothing. I still get these errors:</p>
  
  <pre><code>fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm Code=0 "Migration is required due to the following errors: 
  - Property types for 'unit' property do not match. Old type 'string', new type 'int'
  - Property 'reps' has been added to latest object model." UserInfo={NSLocalizedDescription=Migration is required due to the following errors: 
  - Property types for 'unit' property do not match. Old type 'string', new type 'int'
  - Property 'reps' has been added to latest object model.}: file   /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-700.1.101.15/src/swift/stdlib/public/core/
  </code></pre>
  
  <p>Any ideas?</p>