Load relations with Json Data

[EdsonRCJ]

This JSON can't be loaded on $model->load(Yii::$app->request->post())... Just with : $model->attributes, but this doesn't load the relations
{ "id":"6", "idEscolaridade":"16", "descricao":"teste", "salario":5500.00, "Escolaridades":{ "id":"16", "descricao":"testando" } }

I'm using 'jaacoder/yii2-activated' to mapping the attributes, works for the parent model, but doesn't work for related models (ID column only)