Android - Realm如何通过布尔查询

Question

I have started to use ´Realm´ and I cannot figure out how to get all the results with the value equals to true .

Take a look my code below:

Java Class

@RealmClass
public class Bookmark extends RealmObject {
    private java.lang.String IdBookMark;
    private boolean BookMarkActive;

    public String getIdBookMark() {
        return IdBookMark;
    }

    public void setIdBookMark(String idBookMark) {
        IdBookMark = idBookMark;
    }

    public boolean isBookMarkActive() {
        return BookMarkActive;
    }

    public void setBookMarkActive(boolean bookMarkActive) {
        BookMarkActive = bookMarkActive;
    }
}

Function:

private boolean AnyBookMark (){
    Realm realm = Realm.getInstance(getContext());
    RealmQuery<Bookmark> query = realm.where(Bookmark.class);
    query.contains("BookMarkActive","true");
    RealmResults<Bookmark> userBookmarks = query.findAll();
    return userBookmarks.isEmpty();
}

Error:

FATAL EXCEPTION: main Process: gon250.dublinbikes, PID: 2624 java.lang.IllegalArgumentException: Field 'BookMarkActive': type mismatch. Was STRING, expected BOOLEAN. at io.realm.RealmQuery.getColumnIndices(RealmQuery.java:146) at io.realm.RealmQuery.contains(RealmQuery.java:816) at io.realm.RealmQuery.contains(RealmQuery.java:802) at tabs.Tab2.AnyBookMark(Tab2.java:55) at tabs.Tab2.onCreateView(Tab2.java:33)

Version:

compile 'io.realm:realm-android:0.78.0'

What is the proper way to get all the results with BookMarkActive equals to true .

Answer 1

Instead of query.contains("BookMarkActive","true"); you can do query.equalTo("BookMarkActive", true); .

Btw, 0.78.0 is a really old version. I recommend that you upgrade soon ;-)

Answer 2

Function should be something like this:

private boolean anyBookMark() {
    Realm realm = Realm.getInstance(getContext());
    RealmQuery<Bookmark> query = realm.where(Bookmark.class);
    query.equalTo("BookMarkActive", "true");
    RealmResults<Bookmark> userBookmarks = query.findAll();
    return userBookmarks.isEmpty();
}

BookMarkActive column should be String type. If it is some other type then corresponding value should be passed rather that "true"