Hello, this is an exception to realm.
I'd like to set a random value of int type randomId to an instance of a model class called Word.
java.lang.IllegalStateException:Cannot modify managed objects outside of a write transaction.
It causes to occur.Why?
I tried to put any number in setRandomId() instead of random, or to use a method (which uses a method called setMeaning but omits the content) to set a value that works fine with other activities, but the same error statement appears.
Due to the stack overflow, there was no information about this exception handling on Android, so I asked you.
private void setRandom(){
mEditor.putBoolean("random", true);
mEditor.apply();
mRealm=Realm.getDefaultInstance();
RealmResults<Word>realmResults=mRealm.where(Word.class).findAll();
intrealmSize=realmResults.size();
mRealm.close();
boolean num[] = new boolean [realmSize]; // for duplicate determination
Random random=new Random(); // Random number
// Keep all duplicate sequences false
for(inti=0;i<realmSize;i++){
num[i] = false;
}
for(inti=0;i<realmSize;){
intp = land.nextInt(realmSize);
if(!num[p]){
Word=mRealm.where(Word.class).equalTo("id", i).findFirst();
word.setRandomId(p);// This is where the crash occurs
num[p] = true;
i++;
mRealm.beginTransaction();
mRealm.copyToRealmOrUpdate(word);
mRealm.commitTransaction();
mRealm.close();
}
}
}
Cannot modify managed objects outside of a write transaction.
The error message is correct.Any changes to the properties of objects stored in Realm (=managed objects) must be made in a transaction.
(Objects before saving to Realm are just objects, not just objects)
The word object in the code below is a Managed object because it was retrieved from Realm in mRealm.where(Word.class).equalTo("id", i).findFirst();.Changes must be made within the transaction.
if(!num[p]){
Word=mRealm.where(Word.class).equalTo("id", i).findFirst();
word.setRandomId(p);// This is where the crash occurs
num[p] = true;
i++;
mRealm.beginTransaction();
mRealm.copyToRealmOrUpdate(word);
mRealm.commitTransaction();
mRealm.close();
}
Expand the scope of the transaction to make it easier:
if(!num[p]){
mRealm.beginTransaction();
Word=mRealm.where(Word.class).equalTo("id", i).findFirst();
word.setRandomId(p);// This is where the crash occurs
num[p] = true;
i++;
mRealm.copyToRealmOrUpdate(word);
mRealm.commitTransaction();
mRealm.close();
}
However, this process is done in the For loop, so if there is no particular reason, it is better to extend the transaction to the outside of the loop.Committing a transaction is a fairly expensive process, so performance will be poor if you start and commit every transaction in the loop.
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