flask wtforms selectfield选项未更新 [英] flask wtforms selectfield choices not update

问题描述

class ArticleForm(Form):
    type = SelectField('type', choices=[(h.id, h.name) for h in ArticleType.query.all()], coerce=int)

下面是我如何在视图中使用ArticleForm

below is how I use the ArticleForm in views

@admin.route('/article/add',methods=['get','post'])
def article_create():
    article_form = ArticleForm()

我的问题是，每次我访问/article/add时，selectField都不会读取db

my problem is that the selectField is not read the db each time I visit /article/add

如果我在ArticleType中添加了新类型，则在重新启动服务器之前，selectField的选择将不会更新该选择.

If I add a new type in the ArticleType the choice of the selectField will not update the choice until I restart the server.

但是如果我像下面这样使用

but If I use like below

@admin.route('/article/add',methods=['get','post'])
def article_create():
    article_form = ArticleForm()
    article_form.type.choices = [(h.id, h.name) for h in ArticleType.query.all()]

articleType得到更新. 那么这是什么问题...

the articleType get updated.. so what's the problem with this...

推荐答案

当我遇到此问题时，我会通过填充__init__我的Form方法中的选项来解决它

When I met this problem I resolve it with populating choices in __init__ method of my Form

class ArticleForm(Form):
    type = SelectField()

    def __init__(self, *args, **kwargs):
        form = super(ArticleForm, self).__init__(*args, **kwargs)
        form.type.choices = [(h.id, h.name) for h in ArticleType.query.all()]
        return form

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