使用 Vapor 时，当模型是类时，Xcode 不会停止索引

Question

当遵从 Vapor 中的类的模型协议时，我想出了这样一个类：

import Foundation
import Vapor
import Fluent

struct Intubation: Model {
    var exists: Bool = false
    var id: Node?
    var intubationID: String
    var residentName: String
    var residentSpec: String
    var date: String
    var attending: String
    var PGY: String
    var medical: String?
    var technique: String
    var reason: String
    var dlifOverall: String
    var dsfOverall: String
    var dpfOverall: String
    var dvfOverall: String
    var dsafOverall: String
    var lowOxySatBefore: Int
    var lowOxySatDuring: Int
    var lowOxySatAfter: Int
    var lowSysBpBefore: Int
    var lowSysBpDuring: Int
    var lowSysBpAfter: Int
    var intubationOverall: String
    var comments: String


init(intubationID: String, date: String, residentName: String, residentSpec: String, attending: String, PGY: String, medical: String? = nil, technique: String, reason: String, dlifOverall: String, dsfOverall: String, dpfOverall: String, dvfOverall: String, dsafOverall: String, intubationOverall: String, comments: String, lowOxySatBefore: Int, lowOxySatDuring: Int, lowOxySatAfter: Int, lowSysBpBefore: Int, lowSysBpDuring: Int, lowSysBpAfter: Int) {

    self.intubationID = intubationID
    self.date = date
    self.residentName = residentName
    self.residentSpec = residentSpec
    self.attending = attending
    self.PGY = PGY
    self.medical = medical
    self.technique = technique
    self.reason = reason
    self.dlifOverall = dlifOverall
    self.dsfOverall = dsfOverall
    self.dpfOverall = dpfOverall
    self.dvfOverall = dvfOverall
    self.dsafOverall = dsafOverall
    self.intubationOverall = intubationOverall
    self.comments = comments
    self.lowSysBpAfter = lowSysBpAfter
    self.lowOxySatAfter = lowOxySatAfter
    self.lowSysBpBefore = lowSysBpBefore
    self.lowOxySatBefore = lowOxySatBefore
    self.lowSysBpDuring = lowSysBpDuring
    self.lowOxySatDuring = lowOxySatDuring
}

init(node: Node, in context: Context) throws {
    id = try node.extract("id")
    intubationID = try node.extract("intubationID")
    date = try node.extract("date")
    residentName = try node.extract("residentName")
    residentSpec = try node.extract("residentSpec")
    attending = try node.extract("attending")
    PGY = try node.extract("PGY")
    medical = try node.extract("medical")
    technique = try node.extract("technique")
    reason = try node.extract("reason")
    dlifOverall = try node.extract("dlifOverall")
    dsfOverall = try node.extract("dsfOverall")
    dpfOverall = try node.extract("dpfOverall")
    dvfOverall = try node.extract("dvfOverall")
    dsafOverall = try node.extract("dsafOverall")
    intubationOverall = try node.extract("intubationOverall")
    comments = try node.extract("comments")
    lowSysBpAfter = try node.extract("lowSysBpAfter")
    lowOxySatAfter = try node.extract("lowOxySatAfter")
    lowSysBpBefore = try node.extract("lowSysBpBefore")
    lowOxySatBefore = try node.extract("lowOxySatBefore")
    lowSysBpDuring = try node.extract("lowSysBpDuring")
    lowOxySatDuring = try node.extract("lowOxySatDuring")
}


func makeNode(context: Context) throws -> Node {
    return try Node(node: ["id": id,
                           "intubationID": intubationID,
                           "residentName": residentName,
                           "residentSpec": residentSpec,
                           "attending": attending,
                           "PGY": PGY,
                           "medical": medical,
                           "technique": technique,
                           "reason": reason,
                           "dlifOverall": dlifOverall,
                           "dsfOverall": dsfOverall,
                           "dpfOverall": dpfOverall,
                           "dvfOverall": dvfOverall,
                           "dsafOverall": dsafOverall,
                           "intubationOverall": intubationOverall,
                           "comments": comments,
                           "lowSysBpAfter": lowSysBpAfter,
                           "lowOxySatAfter": lowOxySatAfter,
                           "lowSysBpBefore": lowSysBpBefore,
                           "lowOxySatBefore": lowOxySatBefore,
                           "lowSysBpDuring": lowSysBpDuring,
                           "lowOxySatDuring": lowOxySatDuring])
}

static func prepare(_ database: Database) throws {
    try database.create("intubations") { intubations in
        intubations.id()
        intubations.string("intubationID")
        intubations.string("residentName")
        intubations.string("residentSpec")
        intubations.string("attending")
        intubations.string("PGY")
        intubations.string("medical")
        intubations.string("technique")
        intubations.string("reason")
        intubations.string("dlifOverall")
        intubations.string("dsfOverall")
        intubations.string("dpfOverall")
        intubations.string("dvfOverall")
        intubations.string("dsafOverall")
        intubations.string("intubationOverall")
        intubations.string("comments")
        intubations.int("lowSysBpAfter")
        intubations.int("lowOxySatAfter")
        intubations.int("lowSysBpBefore")
        intubations.int("lowOxySatBefore")
        intubations.int("lowSysBpDuring")
        intubations.int("lowOxySatDuring")
    }
}

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


}

此代码不允许 Xcode 完成索引。它卡住了，没有完成，也没有编译，因为它正忙于尝试索引。 但是！如果它被标记为 struct 而不是 class 它会编译并且 Xcode 完成索引

Answer 1

这是不时出现的问题，我会尽力解释。

node 之所以能够以这种方式使用字典文字，是因为大量的泛型重载和推理。不幸的是，这会以指数方式增加编译时间，以至于有时会导致无法编译。

在 Vapor 2（目前处于 alpha 阶段）中，我们做了一些工作来加强这一点，并使用户更清楚。现在，让我们解决手头的问题。

如下分解你的makeNode函数：

var node = Node.object([:])
node["key"] = try value.makeNode()
// .. continue
return node

这个格式有点长，但对编译器有很大帮助

蒸汽 2

它还没有发布，但是当我在这里时，答案不会过时。 （上面的代码仍然可以工作！）

var node = Node([:])
try node.set("key.path", value)
// ... continue
return node