Python 从数据库或会话数据填充字段的正确方法是什么?
当用户登录时,我将在会话中存储一些变量,以便稍后用于填充字段Python 从数据库或会话数据填充字段的正确方法是什么?,python,session,flask,wtforms,Python,Session,Flask,Wtforms,当用户登录时,我将在会话中存储一些变量,以便稍后用于填充字段 from flask_wtf import Form from wtforms import SelectField from flask import session class InstitutionForm(Form): city = session['city'] city_tuples = [(x, x) for x in city] organisation = SelectField(
from flask_wtf import Form
from wtforms import SelectField
from flask import session
class InstitutionForm(Form):
city = session['city']
city_tuples = [(x, x) for x in city]
organisation = SelectField(
'organisation',
choices=city_tuples
)
class Institution(View):
methods = ['POST']
def dispatch_request(self):
form = InstitutionForm()
return render_template(
'form/institution.html',
form=form)
当我运行应用程序时,我收到错误“在请求上下文之外工作”。从会话数据填充此字段的正确方法是什么?类定义中的代码在导入时执行,而不是在实例化类时执行。您需要将对
会话
的访问移动到\uuuu init\uuuu
方法,以便在视图函数中创建表单时可以访问该方法
class Institution(Form):
organization = SelectField()
def __init__(self, *args, **kwargs):
self.organization.kwargs['choices'] = [(x, x) for x in session.get('city', ('not set',))]
super().__init__(*args, **kwargs)
这适用于需要应用程序或请求上下文的任何内容,例如数据库查询,而不仅仅是会话