动态地在extjs中向网格添加行

I have a grid with one column 'name' which is empty in the start. I also have a JSONObject within which there is an array of fields. I now need to add each field name as a row in the grid dynamically (since the JSONObject I am receiving via REST services). Please advice as to how do I do that.I have a grid with one column 'name' which is e