How to use the koa-swagger-decorator.path function in koa-swagger-decorator

// return BAD REQUEST status code and email already exists error
            ctx.status = 400;
            ctx.body = 'The specified e-mail address already exists';
        } else {
            // save the user contained in the PUT body
            const user = await userRepository.save(userToBeUpdated);
            // return CREATED status code and updated user
            ctx.status = 201;
            ctx.body = user;
        }

    }

    @request('delete', '/users/{id}')
    @summary('Delete user by id')
    @path({
        id: { type: 'number', required: true, description: 'id of user' }
    })
    public static async deleteUser(ctx: BaseContext) {

        // get a user repository to perform operations with user
        const userRepository = getManager().getRepository(User);

        // find the user by specified id
        const userToRemove: User = await userRepository.findOne(+ctx.params.id || 0);
        if (!userToRemove) {
            // return a BAD REQUEST status code and error message
            ctx.status = 400;
            ctx.body = 'The user you are trying to delete doesn\'t exist in the db';
        } else if (+ctx.state.user.id !== userToRemove.id) {
            // check user's token id and user id are the same
            // if not, return a FORBIDDEN status code and error message

} else if (await userRepository.findOne({ email: userToBeSaved.email })) {
            // return BAD REQUEST status code and email already exists error
            ctx.status = 400;
            ctx.body = 'The specified e-mail address already exists';
        } else {
            // save the user contained in the POST body
            const user = await userRepository.save(userToBeSaved);
            // return CREATED status code and updated user
            ctx.status = 201;
            ctx.body = user;
        }
    }

    @request('put', '/users/{id}')
    @summary('Update a user')
    @path({
        id: { type: 'number', required: true, description: 'id of user' }
    })
    @body(userSchema)
    public static async updateUser(ctx: BaseContext) {

        // get a user repository to perform operations with user
        const userRepository: Repository = getManager().getRepository(User);

        // update the user by specified id
        // build up entity user to be updated
        const userToBeUpdated: User = new User();
        userToBeUpdated.id = +ctx.params.id || 0; // will always have a number, this will avoid errors
        userToBeUpdated.name = ctx.request.body.name;
        userToBeUpdated.email = ctx.request.body.email;

        // validate user entity

public static async getUsers(ctx: BaseContext) {

        // get a user repository to perform operations with user
        const userRepository: Repository = getManager().getRepository(User);

        // load all users
        const users: User[] = await userRepository.find();

        // return OK status code and loaded users array
        ctx.status = 200;
        ctx.body = users;
    }

    @request('get', '/users/{id}')
    @summary('Find user by id')
    @path({
        id: { type: 'number', required: true, description: 'id of user' }
    })
    public static async getUser(ctx: BaseContext) {

        // get a user repository to perform operations with user
        const userRepository: Repository = getManager().getRepository(User);

        // load user by id
        const user: User = await userRepository.findOne(+ctx.params.id || 0);

        if (user) {
            // return OK status code and loaded user object
            ctx.status = 200;
            ctx.body = user;
        } else {
            // return a BAD REQUEST status code and error message