Parse.com与ParseObject的关系

Question

我试图修复两个ParseObjects之间的关系：Place＆amp;访问。 我尝试了将对象扩展到ParseObjects的方法，这是一种干净的方法。问题是相关的Place对象没有被保存。

地点：

@ParseClassName("Place")
public class Place extends ParseObject {

    public Place() {
    }

    private String title;
    private ParseGeoPoint geoPoint;

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public ParseGeoPoint getGeoPoint() {
        return geoPoint;
    }

    public void setGeoPoint(ParseGeoPoint geoPoint) {
        this.geoPoint = geoPoint;
    }

    //Get distance to current location
    public double getDistance(ParseGeoPoint currentLocation) {
        return this.geoPoint.distanceInKilometersTo(currentLocation);
    }
}

访问

@ParseClassName("Visit")
public class Visit extends ParseObject {

    public Visit() {
    }

    private long timestamp;
    private long duration;

    private Place place;

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    public long getDuration() {
        return duration;
    }

    public void setDuration(long duration) {
        this.duration = duration;
    }

    public Place getPlace() {
        return place;
    }

    public void setPlace(Place place) {
        this.place = place;
    }
}

这是我保存到后端的方式：

final Place place = new Place();
        place.setTitle("Home");

        final Visit visit = new Visit();
        visit.setTimestamp(Utils.getUnixNow());
        visit.setPlace(place);

        visit.saveEventually(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                if (e == null) {
                    Logger.d("visit " + place.getTitle() + " was saved");
                } else {
                    Logger.d("Place was not saved, error " + e.getCode());
                }
            }
        });

这两个类都在MyApplication类中注册。

Answer 1

首先：你的Parse类的实现是错误的。

1-删除所有字段变量

2-创建getter和setter，如下所示

public String getTitle() {
    return get("Title"); // 'Title' is the column name in your Parse server table
}

public void setTitle(String title) {
    put("Title", title);
}

如果要返回解析对象，

public ParseObject  getPlace () { // it's ParseObject  not Place
    return get("Place "); // 'Place ' is the column name in your Parse server table
}

public void setPlace (ParseObject title) { // it's ParseObject  not Place 
    put("Place ", title);
}

创建对象

Place place= ParseObject.create(Place .class);
place.setTitle("some title");

Visit visit= ParseObject.create(Visit.class);
visit.setPlace(place);
visit.save(); // or use saveInBackground();

在您的应用程序类

中

    ParseObject.registerSubclass(Visit.class);
    ParseObject.registerSubclass(Place.class);
    Parse.initialize(this);