Model- Association is one of the beautiful features of extjs4. Sencha documentation has plenty of examples on 'how to read association' but it doesn't have official documentation on 'how to update model along with its association' which is also a required feature most of the times.
Copy following code snippet in a javascript file and include it in your JSP/html page after extjs framework file inclusion.
<script type="text/javascript" src="extjs4/ext-all-dev.js"></script>
<script type="text/javascript" src="ext-model-assoc-override.js"></script>
Source : sencha forum topic.
Detailed example : http://stackoverflow.com/questions/9871440/extjs-store-hasmany-belongsto-and-update-process-howto
Note: Following code only works for has many associations. We need to extend this for has one, in case if we want it for has one associations.
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