SQLAlchemy / WTForms：为QuerySelectField设置默认的选定值 [英] SQLAlchemy/WTForms: set default selected value for QuerySelectField

问题描述

这个[示例] [1]用Flask中的WTForms和SQLAlchemy建立一个表单，并向表单中添加一个QuerySelectField。我没有使用 flask.ext.sqlalchemy ，我的代码：

  ContentForm = model_form（Content，base_class = Form）
 ContentForm.author = QuerySelectField（'Author'，get_label =name）
 myform = ContentForm（request.form，content）
 myform。 author.query = query_get_all（作者）
  

现在我想设置默认值QuerySelectField的选择列表。

$ b 尝试在QuerySelectField中传递默认值 kwarg并设置选中属性。没有工作。我错过了什么明显的？有人可以帮忙吗？

解决方案

您需要设置您的默认关键字参数到作者你想成为默认的实例：

  ＃假设，假设当前用户最有意义
＃这仅仅是一个例子，为了
 user = Authors.get（current_user.id）
 ContentForm。 author = QuerySelectField（'Author'，get_label ='name'，default = user）
  

可以将实例提供给实例化的字段：

 ＃只有当
＃author是不在request.form或内容
 myform = ContentForm（request.form，obj = content，author = user）
  

This [example][1] to set up a form with WTForms and SQLAlchemy in Flask and add a QuerySelectField to the form works. I am not using flask.ext.sqlalchemy, my code:

ContentForm = model_form(Content, base_class=Form)
ContentForm.author = QuerySelectField('Author', get_label="name")
myform = ContentForm(request.form, content)
myform.author.query = query_get_all(Authors)

Now I want to set the default value of the QuerySelectField's selectlist.

Tried passing a default kwarg in QuerySelectField and setting selected attributes. Nothing worked. Am I missing something obvious? Can someone help?

解决方案

You need to set your default keyword argument to the instance of Authors that you want to be the default:

# Hypothetically, let's say that the current user makes the most sense
# This is just an example, for the sake of the thing
user = Authors.get(current_user.id)
ContentForm.author = QuerySelectField('Author', get_label='name', default=user)

Alternately, you can provide the instance to the field on instantiation:

# The author keyword will only be checked if
# author is not in request.form or content
myform = ContentForm(request.form, obj=content, author=user)

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