對PostBack Event中的字串進行處理，由於這個參數僅能放入字串，所以可以套用網頁Query的方式進行參數傳遞

實作PostBack Action參數傳遞

先替之前的Rich Menu加上功能，將上方選單的三個按鈕，改成PostBackAction，data="action=ShowProductList?pcid={餐點類別ID}}"

def init_default_rich_menu(line_bot_api:LineBotApi, yes=False):
    if(not yes):yes = askyes()
    if(not yes):return False
    areas = [RichMenuArea(
                bounds=RichMenuBounds(x=0, y=0, width=512, height=512),
                action=PostbackAction(
                    label="顯示購物車內容",
                    data="action=ShowProductList?pcid=16",
                    display_text="查詢早餐"
                )
            ),
            RichMenuArea(
                bounds=RichMenuBounds(x=512, y=0, width=512, height=512),
                action=PostbackAction(
                    label="顯示購物車內容",
                    data="action=ShowProductList?pcid=17",
                    display_text="查詢午餐"
                )
            ),
            RichMenuArea(
                bounds=RichMenuBounds(x=1024, y=0, width=512, height=512),
                action=PostbackAction(
                    label="顯示購物車內容",
                    data="action=ShowProductList?pcid=10",
                    display_text="查詢飲料"
                )
            ),
            RichMenuArea(
                bounds=RichMenuBounds(x=0, y=512, width=512, height=512),
                action=MessageAction(label="按下問號按鈕", text="顯示操作說明")
            ),
            RichMenuArea(
                bounds=RichMenuBounds(x=512, y=512, width=512, height=512),
                action=PostbackAction(
                    label="顯示購物車內容",
                    data="action=ShowShoppingCartContents",
                    display_text="我的購物車內有什麼"
                )
            ),
            RichMenuArea(
                bounds=RichMenuBounds(x=1024, y=512, width=512, height=512),
                action=PostbackAction(
                    label="查詢訂單",
                    data="action=ShowOrderStatus",
                    display_text="查詢訂單"
                )            
            )
        ]
    richmenuid = linecc.Create_Rich_Menu(line_bot_api, 1536, 1024, "default_Rich_Menu", "主選單", areas)
    print(f"rich_menu_id :{richmenuid}")
    if(richmenuid):return True
    else:return False

修改Server.py，以urllib.parse將data拆解為path與Value，如:

data:action=ShowProductList?pcid=16
data.path = action=ShowProductList, datavalue = {'pcid': ['16']}

記得加上找不到產品類別的意外處理

@handler.add(PostbackEvent)
def handler_postback(event):
    prof = line_bot_api.get_profile(event.source.user_id)
    data = event.postback.data
    # app.logger.debug(f"data:{data}")
    if(data == 'action=ShowShoppingCartContents'):
        cart_info, cart_amount = dbpm.QUY_Shopping_Cart_info_by_uid(event.source.user_id)
        app.logger.debug(f"{prof.display_name} 查詢購物車, uid:{event.source.user_id}, {cart_info}")
        replay_text = '\n'.join(str(v) for v in cart_info) + f"\n總共:{cart_amount}元"
        line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text=replay_text)
        )
    else:
        from urllib.parse import urlparse, parse_qs
        datapath = urlparse(data).path
        datavalue = parse_qs(urlparse(data).query)
        if(datapath == "action=ShowProductList"):
            pcid = datavalue.get('pcid')[0] or None
            if(not pcid):
                app.logger.error(f"錯誤:找不到pcid:{pcid}")
                line_bot_api.reply_message(
                    event.reply_token,
                    TextSendMessage(text=f"發生錯誤，請聯絡客服取得協助, 錯誤訊息:找不到pcid:{pcid}")
                )
            else:
                replay_text = Handler.ShowProductListHandler(pcid) or "錯誤:action=ShowProductList Return None"
                line_bot_api.reply_message(
                    event.reply_token,
                    TextSendMessage(text=replay_text)
                )

從資料庫中拉出product_name, product_decp, quantity, price, pid等欄位，並轉成List

    def QUY_Products_info_by_pcid(self, pcid):
        cur = self.conn.cursor()
        query = sql.SQL("SELECT product_name, product_decp, quantity, price, pid FROM {} WHERE categoryid = %s").format(sql.Identifier('products'))
        cur.execute(query, (pcid,))
        prods = cur.fetchall()
        cur.close()

        if(prods):
            return list(map(list, prods))
        return None

Sample:

prod_list:[['原味蛋餅', '手工餅皮，原味蛋餅', 9999, 30, 27], ['起司蛋餅', '手工餅皮，起司蛋餅', 9999, 40, 28], ['培根蛋餅', '手工餅皮，培根蛋餅', 9999, 40, 29], [' 培根蛋三明治', '台式培根蛋三明治', 9999, 40, 30], ['鮪魚蛋三明治\n', '台式鮪魚蛋三明治', 9999, 40, 31], ['卡拉雞腿堡', '卡拉雞腿堡，含荷包蛋', 9999, 60, 32]]

加上可讀性

OrderHandlier.py

def ShowProductListHandler(pcid):
    prod_list = dbpm.QUY_Products_info_by_pcid(pcid=pcid)
    if(not prod_list):return None

    info_list = []
    for prod in prod_list:
        info_list.append(f"【{prod[0]}】 餐點說明↓\n\n{prod[1]}\n\n庫存:{prod[2]}\t售價:{prod[3]}\t訂購代號:{prod[4]}\n")

    return '\n'.join(str(v) for v in info_list)

Sample:

d27總結

應該還要加個產品有效期限檢查的，但今天有點急，明天做從Line進行放入購物車，購物車品項調整的功能，再看看還有沒有要加上去