当行里出现行的信息时，tree视图无法展示。
即可用下面数据格式来

line_info = fields.Html(u'行信息', compute='compute_get_line_info')

@api.multi
def compute_get_line_info(self):
    for order in self:
        html_str = ""
        index =0for line in order.order_line:if index >2:
                html_str +=''%('..........')break
            html_str +='
 
        
              
%s
  
                 
%s
%s
%s
' % (line.product_id.display_name, line.product_qty)
            index += 1
        html_str += '
'
        else:
            html_str = ''
        order.line_info = html_str
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当大于2行时，其余的用…代替