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aquaibm

public func routes(_ router: Router) throws {
    
    let uCtrller = UserController()
    let usersRouter = router.grouped("api","users")
    usersRouter.get("subscribetopics",Int.parameter, use: uCtrller.getSubscribeTopics)
    usersRouter.post(SiblingPair.self, at: "subscribe", use: uCtrller.subscribe)  
  
    let tpCtrller = TopicController()
    let topicsRouter = router.grouped("api","topics")
    topicsRouter.get("subscribers",String.parameter, use: tpCtrller.getTopicSubscriber)

aquaibm

struct TopicController {
    func getTopicSubscriber(_ req: Request) throws -> Future<[User]> {
        let name = try req.parameters.next(String.self)
        guard let convert = name.removingPercentEncoding else {
            throw Abort(.expectationFailed, reason: "主题名称无效", identifier: nil)
        }
        
        return Topic.query(on: req).filter(\.name ~= convert).first().flatMap({ (topic) in
            guard let topic = topic else {
                throw Abort(.badRequest, reason: "主题不存在", identifier: nil)

aquaibm

struct UserController {
    func getSubscribeTopics(request: Request) throws -> Future<[Topic]> {
        let id = try request.parameters.next(Int.self)
        return User.query(on: request).filter(\.id == id).first().flatMap({ (user) in
            guard let user = user else {
                throw Abort(.notFound, reason: "没有此用户", identifier: nil)
            }
            return try user.subscribeTopics.query(on: request).all()
        })
    }

aquaibm

struct UserTopicPivot: SQLitePivot {
    var id: Int?
    var userID: Int
    var topicID: Int
    
    typealias Left = User
    typealias Right = Topic
    static let leftIDKey: LeftIDKey = \.userID
    static let rightIDKey: RightIDKey = \.topicID
}