Question

我看了一遍，但我找不到这个问题的答案。

我正在将播客及其相关剧集保存到Parse，但以下代码仅保存1集和播客（我想在for循环中找到的每个条目都会重置currentP并且只保存找到的最后一个值）。

 let currentP = PFObject(className: self.podcastClass)
    currentP["user"] = PFUser.currentUser()
    currentP["name"] = name
    currentP["artist"] = artist
    currentP["summary"] = summary
    currentP["feedURL"] = feedURL
    currentP["artworkURL"] = artworkURL
    currentP["artwork"] = artwork
    currentP["date"] = date

 let episodesToParse = PFObject(className: self.episodesClass)
    for episode in episodes {
    episodesToParse["showDate"] = episode.date
    episodesToParse["title"] = episode.title          
    episodesToParse["downloadURL"] =  episode.enclosures[0].valueForKey("url") as? String
    episodesToParse["showNotes"] = episode.summary
    episodesToParse["localPath"] = ""
    episodesToParse["isDownloaded"] = "no"
    episodesToParse["parent"] = currentP
}
 episodesToParse.saveInBackground()

如果我使用episodesToParse.addObject(episode.date, forKey: "showDate")之类的内容，则会返回以下错误：

[Error]: invalid type for key showDate, expected date, but got array (Code: 111, Version: 1.8.1)

我不知道该怎么办。我想要的是currentP被保存，它的所有剧集都保存在与其父级（Podcast）有关系的不同类中。如果你一次添加一集而不是一大堆（我希望能够一次保存500个episodesToParse个实例，我发现了很多方法可以做到这一点。

感谢您的帮助。

Answer 1

问题是，你在循环后保存episodesToParse。您必须在循环内移动episodesToParse.saveInBackground()，以便每次循环设置剧集的属性时剧集都会更新：

for episode in episodes {
    episodesToParse["showDate"] = episode.date
    episodesToParse["title"] = episode.title          
    episodesToParse["downloadURL"] =  episode.enclosures[0].valueForKey("url") as? String
    episodesToParse["showNotes"] = episode.summary
    episodesToParse["localPath"] = ""
    episodesToParse["isDownloaded"] = "no"
    episodesToParse["parent"] = currentP

    //Inside
    episodesToParse.saveInBackground()
}

或者您可以使用PFObject.saveAllInBackground保存所有对象：

var episodesToSave[PFObject] = []

for episode in episodes {
    var episodeToParse
    episodeToParse["showDate"] = episode.date
    episodeToParse["title"] = episode.title          
    episodeToParse["downloadURL"] =  episode.enclosures[0].valueForKey("url") as? String
    episodeToParse["showNotes"] = episode.summary
    episodeToParse["localPath"] = ""
    episodeToParse["isDownloaded"] = "no"
    episodeToParse["parent"] = currentP

    //Add to episode-array
    episodesToSave.append(episodesToParse)
}

//Save all objects in the array
PFObject.saveAllInBackground(episodesToSave)

一对多关系Parse

1 个答案: