Question

当第二个（子）请求依赖于第一个（父）请求时，我试图弄清楚如何编写FB Graph API请求（FB SDK 4.0和Swift）。具体来说，我想获得一个用户的专辑和每张专辑的封面照片。

me / albums？fields = name，cover_photo＆lt; - 获取用户相册请求
/ 888474748＆lt; - 获取封面照片请求

关于此问题的文档非常含糊，FBSDKGraphRequestConnection的API文档提到了方法 addRequest：completionHandler：batchParameters：可以接受诸如＆＃34; name＆＃34;之类的参数。和＆＃34;依赖＆＃34;。这似乎是我正在寻找的方法，但我可以在Obj-C或Swift中找到它的使用示例。

看起来应该是这样的吗？谢谢！

 let albumRequest = FBSDKGraphRequest(graphPath: "me/albums?fields=name,cover_photo", parameters: nil)
    let albumCoverRequest = FBSDKGraphRequest(graphPath: "cover_photo_id", parameters: nil) //what should this look like? jsonpath?
    let graphConnection = FBSDKGraphRequestConnection()
    graphConnection.addRequest(albumRequest, completionHandler: { (connection:FBSDKGraphRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
        if(error != nil){
            println(error)
        }else{

        }
        },batchParameters: ["name" : "albums"])

    graphConnection.addRequest(albumRequest, completionHandler: { (connection:FBSDKGraphRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
        if(error != nil){
            println(error)
        }else{

        }
        },batchParameters: ["depends_on" : "albums"]) //should this be some jsonpath expression?

Answer 1

弄清楚了。

let albumRequest = FBSDKGraphRequest(graphPath: "me/albums?fields=name,cover_photo", parameters: nil)
    let albumCoverRequest = FBSDKGraphRequest(graphPath: "?ids={result=albums:$.data.*.cover_photo}", parameters: nil) // use jsonpath syntax to "inject" parent results into "child" request
    let graphConnection = FBSDKGraphRequestConnection()
    graphConnection.addRequest(albumRequest, completionHandler: { (connection:FBSDKGraphRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
        if(error != nil){
            println(error)
        }else{
            println(result)
        }
        },batchParameters: ["name" : "albums"]) //Set "parent" batch alias

    graphConnection.addRequest(albumCoverRequest, completionHandler: { (connection:FBSDKGraphRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
        if(error != nil){
            println(error)
        }else{
            println(result)
        }
        },batchParameters: ["depends_on" : "albums"]) //depend on parent batch alias
    graphConnection.start()

Facebook iOS SDK＆amp; Swift - 如何创建依赖批处理请求？

1 个答案: