Swift config.preparements.append（modelName.self）使用未解析标识符“modelName”时出错

我已经通过fluent provider的正确方法，使用vapor服务器端和PostgreSQL provider数据库为我的模型Swift建立了关系，我遵循了fluent的一般方法，但我不知道我在扩展模型名准备时犯了什么错误， 下面是我的modelName.swift和main.swift的代码

梅因·斯威夫特

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我认为根本原因是模块分离。 如果将vapor项目创建为vapor new，则main.swift在运行模块中，modelName.swift在应用模块中

当访问其他模块类时，目标类的访问级别为必须使用open或public

请注意，您还必须根据此更改修改其他方法声明

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谢谢。

将modelName.swift移动到运行文件夹中

我将其更改为公共文件夹，但出现了相同的错误，目录main.swift位于运行模块中，modelName.swift位于应用模块内的模型文件夹中。因此，默认情况下，运行模块位于应用模块中。无法解决此错误，

 import Foundation
 import Vapor
import FluentProvider
import PostgreSQLProvider


final class modelName: Model {


    let storage = Storage()
    var id: Node?
    var name:String
    var displayName:String
       public var content: String

    init(content: String, displayName:String, name:String) {

        self.content = content
        self.displayName = displayName
        self.name = name
    }

    func forDataBase() {


        let array:[berichtDataPoint] = [intDataPoint(), boolDataPoint(), doubleDataPoint()]

        let _ = array[0] as! intDataPoint
        let _ = array[1] as! doubleDataPoint


        for point in array {

            switch point {
            case is  intDataPoint:
                print("int")
            case is doubleDataPoint:
                print("double")
            case is boolDataPoint:
                print("bool")
            default:
                print("error")
            }
        }

    }

  func makeRow() throws -> Row {
        var row = Row()
        try row.set("id", idKey)
        try row.set("displayName", displayName)
        try row.set("name", name)
        return row
    }

    init(row: Row) throws {
        content = try row.get("content")
        displayName = try row.get("displayName")
        name = try row.get("name")
    }

    func makeNode(context: Context) throws -> Node {
        return try Node(node: [
            "id": id,
            "content": content,
            "displayName": displayName,
            "name": name
            ])
    }
}


extension modelName: Preparation {
    static func prepare(_ database: Database) throws {
        try database.create(self) { modelName in
            modelName.id()
            modelName.string("displayName")
            modelName.string("name")

        }
    }

    static func revert(_ database: Database) throws {
        try database.delete(self)
    }
}

import App
import Vapor
import FluentProvider
import PostgreSQLProvider

/// We have isolated all of our App's logic into
/// the App module because it makes our app
/// more testable.
///
/// In general, the executable portion of our App
/// shouldn't include much more code than is presented
/// here.
///
/// We simply initialize our Droplet, optionally
/// passing in values if necessary
/// Then, we pass it to our App's setup function
/// this should setup all the routes and special
/// features of our app
///
/// .run() runs the Droplet's commands, 
/// if no command is given, it will default to "serve"
let config = try Config()
config.preparations.append(modelName.self) \\error is here '(Use of 
unresolved identifier 'modelName')

let drop = try Droplet(config)
try drop.setup()

try drop.run()

// Package.swift

let package = Package(
    name: "hello",
    targets: [
        Target(name: "App"),
        Target(name: "Run", dependencies: ["App"]),
    ],

// modelName.swift

public class moduleName: Model {
...