Gson将List 反序列化为realmList

I'm using retrofit with gson to deserialize my json into realm objects. This works very well for the most part. Trouble arises when dealing with

我正在使用gson进行改造,将我的json反序列化为领域对象。这在大多数情况下非常有效。处理时遇到麻烦

RealmList(String(or any other basic data type))

RealmList(String(或任何其他基本数据类型))

Since Realm doesnt support RealmList where E doesnt extend Realm object, I wrapped String in a RealmObject.

由于Realm不支持RealmList,其中E不扩展Realm对象,我将String包装在RealmObject中。

public class RealmString extends RealmObject {
  private String val;

  public String getValue() {
    return val;
  }

  public void setValue(String value) {
    this.val = value;
  }
}

My realm Object is as below

我的领域对象如下

    public class RealmPerson extends RealmObject {
    @PrimaryKey
    private String userId;
    ...
    private RealmList<RealmString> stringStuff;
    private RealmList<SimpleRealmObj> otherStuff;

    <setters and getters>
   }

SimpleRealmObj works fine as it only has String elements

SimpleRealmObj工作正常,因为它只有String元素

    public class SimpleRealmObj extends RealmObject {
    private String foo;
    private String bar;
       ...
    }

How can I deserialize stringStuff? I tried using a gson TypeAdapter

如何反序列化stringStuff?我尝试使用gson TypeAdapter

public class RealmPersonAdapter extends TypeAdapter<RealmPerson> {
    @Override
    public void write(JsonWriter out, RealmPerson value) throws IOException {
        out.beginObject();
        Log.e("DBG " + value.getLastName(), "");
        out.endObject();
    }

    @Override
    public RealmPerson read(JsonReader in) throws IOException {
        QLRealmPerson rList = new RealmPerson();
        in.beginObject();
        while (in.hasNext()) {
            Log.e("DBG " + in.nextString(), "");
        }
        in.endObject();

        return rList;
    }

However I still hit the IllegalStateException

但是我仍然遇到了IllegalStateException

2334-2334/com.qualcomm.qlearn.app E//PersonService.java:71﹕ main com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected a string but was NAME at line 1 column 3 path $.

2334-2334 / com.qualcomm.qlearn.app E // PersonService.java:71:main com.google.gson.JsonSyntaxException:java.lang.IllegalStateException:期望一个字符串但在第1行第3列路径$为NAME。

I tried RealmList, RealmString adapter earlier to no avail. The only workaround I managed to find so far is https://github.com/realm/realm-java/issues/620#issuecomment-66640786 Any better options?

我之前试过RealmList,RealmString适配器无济于事。到目前为止,我设法找到的唯一解决方法是https://github.com/realm/realm-java/issues/620#issuecomment-66640786任何更好的选择?

4 个解决方案

#1

The error message "Expected a string but was NAME" can be solved by retrieving the name of the json object in the JsonReader before the actual json object (which is a String in your case).

错误消息“Expected a string but is NAME”可以通过在实际json对象(在您的情况下为String)之前检索JsonReader中的json对象的名称来解决。

You can take a look at the Android documentation for JsonReader. It has detailed explanation and code snippet. You can also take a look at the readMessage method in the sample code snippet in the documentation.

您可以查看JsonReader的Android文档。它有详细的解释和代码片段。您还可以查看文档中示例代码段中的readMessage方法。

I have modified your read method to what I think it should be. NOTE: I didn't test the code, so there may be some minor errors in it.

我已经将您的读取方法修改为我认为它应该是的。注意:我没有测试代码,因此可能会有一些小错误。

@Override
public RealmPerson read(JsonReader in) throws IOException {
    RealmPerson rList = new RealmPerson();
    in.beginObject();
    String name = "";
    while (in.hasNext()) {
        name = in.nextName();

        if (name.equals("userId")) {
            String userId = in.nextString();
            // update rList here 
        } else if (name.equals("otherStuff")) {
            // since otherStuff is a RealmList of RealmStrings,
            // your json data would be an array
            // You would need to loop through the array to retrieve 
            // the json objects
            in.beginArray();
            while (in.hasNext()) {
                // begin each object in the array
                in.beginObject();
                name = in.nextName();
                // the RealmString object has just one property called "value"
                // (according to the code snippet in your question)
                if (name.equals("val")) {
                    String val = in.nextString();
                     // update rList here 
                } else {
                    in.skipValue();
                }
                in.endObject();
            }
            in.endArray();
        } else {
            in.skipValue();
        }
    }
    in.endObject();


    return rList;
}

Let me know if this helps.

如果这有帮助,请告诉我。

4 个解决方案

#1

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