When dynamically creating choices for SelectField in WTForms, I get (u'Choice',) rendered in the dropdown list. I suspect its something to do with unicode, but no idea how to get the correct string.
for example
form.group_id_name.choices = [(row, row) for row in db.session.query(entry.group_id_name).distinct()]
In my forms I have
group_id_name = SelectField('group_id_name')
I would like it to render
<select id="group_id_name" name="group_id_name"><option value="Choice1">Choice1</option><option value="Choice2">Choice2</option></select>
Instead I get
<select id="group_id_name" name="group_id_name"><option value="(u'Choice1',)">(u'Choice1',)</option><option value="(u'Choice2',)">(u'Choice2',)</option></select>
答案 0 :(得分：0)
这与Unicode没有任何关系。
query()返回每行的列值序列。对于只包含一列的查询，您将得到一个长度为1的元组。
当您将元组隐式转换为字符串作为模板的一部分时，您将获得元组的Python代码表示，其类似于(somevalue,)。
您希望在模板中包含列本身的字符串值，因此您应该访问序列的第一个元素，例如：
form.group_id_name.choices = [(row[0], row[0]) for row in db.session.query(entry.group_id_name).distinct()]
或使用解包指定：
form.group_id_name.choices = [(name, name) for (name,) in db.session.query(entry.group_id_name).distinct()]