def member_params(params)
      params.inject({}) { |h, (name, value)| h[name] = value if columns_hash[name]; h }
    end
def member_params(params)
      params.inject({}) { |h, (name, value)| h[name] = value if columns_hash[name]; h }
    end
grid doesnt nest attributes inside the resource
 could change this behavior in jqGrid, see grid.postext.js ?
   http://www.trirand.com/jqgridwiki/doku.php?id=wiki:post_data_module