title: GreenDao persistance issue
body: <p>I am using greenDao in my app to persist complex object.</p>
  
  <p>For example</p>
  
  <pre><code>class A{
  id;
  name;
  List&lt;B&gt; list;
  }
  
  class B{
  id;
  name;
  List&lt;C&gt; list;
  }
  
  class c{
  id;
  name;
  }
  </code></pre>
  
  <p>I got the tables with all class fields(for all classes).</p>
  
  <p><strong>Problem:</strong>
  I can see records for table A(for class A), tables B and C are empty(no records).</p>
  
  <p>I am persisting object of class A like:</p>
  
  <pre><code>A toSave = //class generated by GSON
  
  aDao = daoService.getADao();
  aDao.insert(toSave);
  </code></pre>
  
  <p>Can you please  help me to solve this issue?</p>
  
  <p>Also I cannot find in the documentation if is allowed to query dao object and retrieve object of class A with all information/fields automatically?</p>
  
  <p>thanks!</p>