diff --git a/nop-biz/src/main/java/io/nop/biz/crud/CrudBizModel.java b/nop-biz/src/main/java/io/nop/biz/crud/CrudBizModel.java
index 43018c04ef3cf4d12b3b1bc0d4306c54cd4b9123..6c4c76bd992aa36792412af7222eeb51cdbfcc2f 100644
--- a/nop-biz/src/main/java/io/nop/biz/crud/CrudBizModel.java
+++ b/nop-biz/src/main/java/io/nop/biz/crud/CrudBizModel.java
@@ -200,6 +200,10 @@ public abstract class CrudBizModel<T extends IOrmEntity> implements IBizModelImp
         return daoProvider;
     }
 
+    public IBizObjectManager bizObjectManager() {
+        return bizObjectManager;
+    }
+
     @Inject
     public void setDaoProvider(IDaoProvider daoProvider) {
         this.daoProvider = daoProvider;
diff --git a/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLEngine.java b/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLEngine.java
index 12a4ce5dd3a6d2fee390a67d834aea2fd5593f1f..d380328bba6677b65d6db7bd743b3383d3551d4a 100644
--- a/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLEngine.java
+++ b/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLEngine.java
@@ -402,7 +402,7 @@ public class GraphQLEngine implements IGraphQLEngine {
         field.setFieldDefinition(action);
     }
 
-    private GraphQLFieldSelection initForReturnType(IGraphQLExecutionContext context,
+    public GraphQLFieldSelection initForReturnType(IGraphQLExecutionContext context,
                                                     GraphQLOperationType operationType, String operationName, Object request,
                                                     GraphQLType returnType, FieldSelectionBean selectionBean) {
         GraphQLDocument doc = new GraphQLDocument();
diff --git a/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLExecutor.java b/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLExecutor.java
index c492b1385d9f70adea6eca3ff5b551a63811655a..2b4fb5d89746fd375eeddf2a5134dd92cd0eaa71 100644
--- a/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLExecutor.java
+++ b/nop-graphql/nop-graphql-core/src/main/java/io/nop/graphql/core/engine/GraphQLExecutor.java
@@ -277,7 +277,7 @@ public class GraphQLExecutor implements IGraphQLExecutor {
         return FutureHelper.waitAll(promises);
     }
 
-    private Object fetchSelections(Object source, GraphQLSelectionSet selectionSet, DataFetchingEnvironment env) {
+    protected Object fetchSelections(Object source, GraphQLSelectionSet selectionSet, DataFetchingEnvironment env) {
         Map<String, Object> ret = new LinkedHashMap<>();
 
         List<CompletionStage<?>> promises = _fetchSelections(null, ret, source, selectionSet, env);
@@ -399,7 +399,7 @@ public class GraphQLExecutor implements IGraphQLExecutor {
     // return env;
     // }
 
-    private Object fetchNext(Object value, DataFetchingEnvironment env) {
+    protected Object fetchNext(Object value, DataFetchingEnvironment env) {
         if (isEmpty(value))
             return value;
 
@@ -423,7 +423,7 @@ public class GraphQLExecutor implements IGraphQLExecutor {
         return false;
     }
 
-    private Object fetchList(Collection<?> c, GraphQLSelectionSet selectionSet, DataFetchingEnvironment env) {
+    protected Object fetchList(Collection<?> c, GraphQLSelectionSet selectionSet, DataFetchingEnvironment env) {
         List<Object> list = new ArrayList<>(c.size());
         List<CompletionStage<?>> promises = null;