vapor学习教程-Query Parameters

Query Parameters

请求查询参数可以作为字典进行访问，也可以使用extrac进行提取参数值而不是返回可选类型。

Optional Syntax

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可选语法是处理可选查询参数的最简单方法。

drop.get("comments") { request in
    if let rating = request.query?["rating"]?.int {
        return "You requested comments with rating greater than #\(rating)"
    }
    return "You requested all comments"
}

Extract Syntax

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提取语法可能有助于强制查询参数的存在，如果参数不存在则抛出异常。使用这种语法，首先需要确保查询对象存在。

drop.get("comments") { request in
    guard let rating = request.query?["rating"]?.int else {
        throw Abort.custom(status: .preconditionFailed, message: "Please include a rating")
    }
    return "You requested comments with rating greater than #\(rating)"
}

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