Hands-On Server-Side Web Development with Swift

Retrieving all items

Add the getAllHandler(completion:) method to handle the request for retrieving all items in the database:

// retrieve all itemsfunc getAllHandler(completion: @escaping([JournalItem]?, RequestError?) -> Void) {  JournalItem.findAll() { items, error in    guard let items = items else {      return completion(nil, error)    }    completion(items, nil)  }}

In the closure for the findAll() method, the retrieved array optional items is unwrapped. If the items array is a valid object, a completion closure with unwrapped items will be invoked; otherwise, a completion closure with an error will be called.

Since you do not need to render Stencil web pages for API-based web functions, it is convenient to use the curl command-line tool or a web ...