This method is only available in managed mode

问题

I'm develop an Android app with Realm integrated and I have a problem when I try to search with a query. I try to search a product by its "id" into product list passed by parameter. This method worked perfect but suddenly I got the next exception:

Process: com.singularfactory.ecommerceapp.ecommerceapp, PID: 9372
    io.realm.exceptions.RealmException: This method is only available in managed mode
            at io.realm.RealmList.where(RealmList.java:260)
            at com.singularfactory.ecommerceapp.utility.UtilityDB.findProductIntoChildrenByEntityId(UtilityDB.java:176)
            at com.singularfactory.ecommerceapp.fragment.ProductDetailFragment.setProductRealmToView(ProductDetailFragment.java:378)
            at com.singularfactory.ecommerceapp.fragment.ProductDetailFragment.initializeEnvironment(ProductDetailFragment.java:119)
            at com.singularfactory.ecommerceapp.fragment.ProductDetailFragment.onActivityCreated(ProductDetailFragment.java:96)
            at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1797)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:979)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
            at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:490)
            at com.singularfactory.ecommerceapp.fragment.ListsFragment.openProductDetailFragment(ListsFragment.java:256)
            at com.singularfactory.ecommerceapp.fragment.ListsFragment$5.onClick(ListsFragment.java:193)
            at com.singularfactory.ecommerceapp.adapter.ListsContentAdapter.onClick(ListsContentAdapter.java:78)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

My code:

/**
     * Find a product into Children by entityId
     * @param products
     * @param entityId
     * @return
     */
    public static ProductRealm findProductIntoChildrenByEntityId(RealmList<ProductRealm> products, String entityId) {
        ProductRealm product = null;

        if(products != null) {
            **product = products.where()**  //The problem is here
                    .equalTo("entityId", entityId)
                    .findFirst();
        }

        return product;
    }

My model:

 @RealmClass
public class ProductRealm extends RealmObject implements Serializable {

    private String  catId;                      //Only one category per product. In generic case many category per product
    private String  entityId;
    private String  parentId;
    private String  typeId;                     //"simple" | "configurable"
    private String  sku;
    private String  canaryProduct;
    private String  premium;
    private String  brand;
    private String  dinitosQty;
    private String  name;
    private String  ean;
    private String  description;
    private String  shortDescription;
    private String  weight;
    private String  isSaleable;
    private String  imageUrl;
    private String  unit;
    private String  unitFresh;
    private String  childrenSelected;
    private String  manageStock;
    private float   price;
    private float   minWeight;
    private float   quantityWeight;
    private int     quantity;
    private int     stock;
    private int     typeOfAttribute;            //0: Per units | 1: Per weight | 2: Both
    private int     typeOfChildrenSelected;     //0: Per units | 2: Per weight | -1: Undefined
    private boolean isIntoShoppingCart;         //Flag to indicate if the product is into the Shopping Cart
    private RealmList<AttributeRealm> attributeItems;
    private RealmList<ProductRealm>   children;
    ...
    /* Getters & Setters */

I hope that the question is well detailed.

Thanks in advance :)

回答1:

This is happening because the RealmList you are providing to the findProductIntoChildrenByEntityId method is a standalone one, meaning, not managed by Realm. A standalone RealmList only lives in memory (and not in Realm), which means that it's not possible to query on it.

回答2:

Your public static ProductRealm findProductIntoChildrenByEntityId(RealmList<ProductRealm> products, String entityId) { realmList you provide here must be bound to an existing, open realm instance. The query would run in Realm, and it would run if the objects within the RealmList are copied to Realm.

来源：https://stackoverflow.com/questions/31429239/this-method-is-only-available-in-managed-mode