问题描述
我试图删除一个对象存储在解析一个数组（如[USER1]，[USER2]，[用户3]，我是更改为[USER1]，[用户3]）。我有一个存储模块上的不同的学生，当用户删除我想从存储在学生数组中删除自己的用户ID解析阵列模块，一个模块类
I am trying to remove one object for an array stored in parse (e.g [user1],[user2],[user3], I was to change to [user1],[user3]). I have a module class which stores the different students on the module, when the user removes the module I want to remove their userID from the array stored in the students parse array.
如果这是不可能的，我怎么可以检索整个阵列到本地的ArrayList，编辑它，然后把它放回去？
If that is not possible, how can I retrieve the whole array into a local arraylist, edit it, then put it back?
我已经尝试了一些东西，但至今没有工作过。这是我目前的code这将删除整行，而不仅仅是数组：
I have attempted a few things but none has worked so far. this is my current code which deletes the whole row and not just the array:
moduleDeleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final View temp = v;
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Module");
query.whereEqualTo("moduleCode", getItem(position).getModuleCode());
query.findInBackground(new FindCallback<ParseObject>() {
public void done(List<ParseObject> module, ParseException e) {
if (e == null) {
for (ParseObject delete : module) {
delete.remove(currentUser.getObjectId());
delete.deleteInBackground();
}
Toast.makeText(temp.getContext(), "Deleted", Toast.LENGTH_LONG).show();
} else {
Log.e("Error", e.getMessage());
Toast.makeText(temp.getContext(), "Error deleting", Toast.LENGTH_LONG).show();
}
}
});
}
});
感谢您的帮助！
推荐答案
我找到了一种方法做这需要数组并将其存储在本地，更改它，然后将它发送回来解析。没有最好看的方式，但它的工作！
I found a way to do it which takes the array and stores it locally, changes it, then sends it back to parse. Not the best looking way but it worked!
moduleDeleteButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
students = new ArrayList<String>();
final View temp = v;
ParseQuery<ParseObject> query = ParseQuery.getQuery("Module");
query.whereEqualTo("moduleCode",getItem(position).getModuleCode());
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> list, ParseException e) {
if (e==null) {
if (list.size()>0) {
ParseObject s = list.get(0);
if (s.getList("students")!=null)
{
students = s.getList("students");
}
else
{
students = null;
}
if (students!=null) {
if (students.contains(currentUser.getObjectId())) {
students.remove(currentUser.getObjectId());
s.put("students",students);
s.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException arg0) {
Toast.makeText(temp.getContext(), "Deleted", Toast.LENGTH_LONG).show();
}
});
}
}
}
}
}
});
}
});
这篇关于从Parse.com阵列中删除一个对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！