Moshi can't deserialize Map with List of values, returns LinkedHashTreeMap instead of value&#03-CodePudding

Can't deserialize json to this structure: Map<String, List<SomeClass>>

I can deserialize to Map<String, SomeClass> like this:

ParameterizedType type = Types.newParameterizedType(Map.class, String.class, SomeClass.class);
JsonAdapter<Map<String, SomeClass>> adapter = moshi.adapter(type);

But when there are two collections nested, for example, Map<String, List<SomeClass>>, the next code

ParameterizedType type = Types.newParameterizedType(Map.class, String.class, List.class, SomeClass.class);
JsonAdapter<Map<String, List<SomeClass>>> adapter = moshi.adapter(type);

returns Map<String, List<LinkedHashTreeMap>>, LinkedHashTreeMap has properties of SomeClass as keys and their values as values, and "type"="SomeClass".

How can I solve this, so that deserialization runs okay, as in the first example?

CodePudding user response：

It seems that to deserialize nested collections we have to pass nested parametrized types to the adapter. After changing this

ParameterizedType type = Types.newParameterizedType(Map.class, String.class, List.class, baseType);

to this

ParameterizedType type = Types.newParameterizedType(Map.class, String.class, Types.newParameterizedType(List.class, baseType));

I now have a working solution - I get a Map with List<SomeClass> values not LinkedHashTreeMaps.