Hands-On Server-Side Web Development with Swift

Creating a new Model

You can use either struct or class to conform to Model. Since struct is value-typed, a new copy of the struct model will be returned each time you query the database. Class is reference-typed so there won't be a new copy created when the class model is returned as the result for querying the database:

1. A new model looks like the following:

import FluentPostgreSQLimport Vaporfinal class JournalEntry: PostgreSQLModel {    var id: Int?    var title: String    var content: String        init(id: Int? = nil, title: String, content: String) {        self.id = id        self.title = title        self.content = content    }}

The final modifier prevents anyone from subclassing your model.

2. Specify the id field:

var id: Int?

Fluent uses id for the internal indexing ...