我试图用postgreSQL数据库中某列的数据动态填充下拉列表中的选项。当我试图加载我的表单时,我得到:TypeError:'NoneType'对象不可读取。任何帮助将不胜感激。在
File "/usr/lib/python2.7/site-packages/wtforms/widgets/core.py", line 323, in __call__
for val, label, selected in field.iter_choices():
File "/usr/lib/python2.7/site-packages/wtforms/fields/core.py", line 454, in iter_choices
for value, label in self.choices:
TypeError: 'NoneType' object is not iterable
在模型.py在
^{pr2}$在表单.py在
class NewProjForm(Form):
pj_name = StringField('Project Name', validators=[InputRequired(), Length(min=1, max=1000)])
pj_desc = TextAreaField('Project Description', validators=[InputRequired(), Length(min=1, max=3000)])
coi_name = SelectField('COI:', validators=[InputRequired()])
pj_poc_first = StringField('POC First Name', validators=[InputRequired(), Length(min=1, max=500)])
pj_poc_last = StringField('POC Last Name', validators=[InputRequired(), Length(min=1, max=500)])
在应用程序副本在
@app.route('/addProjForm', methods=['GET','POST'])
def addProjForm():
newProj = NewProjForm(request.form)
newProj.coi_name.choices = db.session.query(ReqCriterion).filter(coi_name)
if request.method == 'POST' and newProj.validate():
addProj = Project(request.form['pj_name'], request.form['pj_desc'], request.form['coi_name'], request.form['pj_poc_first'], request.form['pj_poc_last'])
db.session.add(addProj)
db.session.commit()
return redirect(url_for('project_conf', addProj=addProj))
我应该使用QuerySelectField和lambda,并在模型中添加repr。这对我很有效:
在表单.py在
在模型.py在
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