访问模板内的字典并管理其变量

Question

我需要创建一组带有 int 值的下拉框（例如：1-3），它们在 mongodb 中保存并正确读取。第一次会话后，我想将他们存储的值放在下拉列表中

server.py 上的函数：

@get('/my_url')

def form():

   #get the last entry in database, the most updated one

   for my_document in db.mydb.find():

    pass

   return template('asset_form',**my_document)

asset_form.tpl（部分）：

<h1>My site</h1>     

<hr>

<h3>Asset:   <input name="name1" type="text" value="Mail Server" input disabled /> </h3>

           {{dic_field1}}

           {{dic_field2}}

           {{my_document}}

            <table style="width:100%">

            <tr>

            <th>Col1</th>

            <th>Col2</th>

            <th>Col3</th>  

            <th>Col4</tj>

            </tr>

            <td>

                  <form method="POST" action="/the_post_url">

            <br/>

            Number of day(s):<select name = dic_field1>

              %if{{dic_field1}} == 1:

                <option value="1" selected >1</option>

              %else: 

                <option value="1">1</option>

              %end

              %if {{dic_field1}} == 2:

                <option value="2" selected >2</option>

              %else: 

                <option value="2">2</option>

              %end

              %if {{dic_field1}} == 3:

                 <option value="3" selected>3</option>

              %else: 

                 <option value="3">3</option>

              %end

我可以在 python 服务器中获取值（正确打印它们）。my_document 字典有字段：dic_field1 和 dic_field2，

在模板中，变量“{{my_document}}”输出错误：

NameError("name 'my_document' 未定义",)

其中 dic_field1 和 dic_field2 输出正确。

拥有变量是不够的，因为在“if”中使用它们时，输出如下：

TypeError("不可散列的类型：'set'",)

Answer 1

看来您并不真正了解变量在瓶子中的工作原理。运行原始 python 代码时，不需要大括号。只有在将数据值注入 html 时才需要它们。也只需将结果发送到模板并在模板内处理它们。这样您就不必弄乱源代码，而只需专注于您的模板。@get('/my_url')def form():&nbsp; &nbsp;#get the last entry in database, the most updated one&nbsp; &nbsp;my_document = db.mydb.find()&nbsp; &nbsp;return template('asset_form', mydocument = my_document)资产%dic_field1 = mydocument['dic_field1']%dic_field1 = mydocument['dic_field2']%dic_field1 = mydocument['dic_field3']<h1>My site</h1>&nbsp; &nbsp; &nbsp;<hr><h3>Asset:&nbsp; &nbsp;<input name="name1" type="text" value="Mail Server" input disabled /> </h3>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{{dic_field1}}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{{dic_field2}}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{{dic_field3}}&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <table style="width:100%">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <tr>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <th>Col1</th>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <th>Col2</th>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <th>Col3</th>&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <th>Col4</tj>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </tr>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <td>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <form method="POST" action="/the_post_url">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Number of day(s):<select name = {{dic_field1}}>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %if dic_field1 == 1:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <option value="1" selected >1</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %else:&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <option value="1">1</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %end&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %if dic_field1 == 2:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <option value="2" selected >2</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %else:&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <option value="2">2</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %end&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %if dic_field1 == 3:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<option value="3" selected>3</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %else:&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<option value="3">3</option>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; %end