我一直坚持为我的 Flask 表单创建验证器，我遵循了其他问题/链的说明，但没有一个起作用。
以下是我的表格：
class RegisterForm(FlaskForm):
artist = BooleanField("Are you an artist?", default=False)
organiser = BooleanField("Do you organise events?", default=False)
dj = BooleanField("Are you a DJ?", default=False)
proof_photo = FileField(label="Upload proof photo (artists and/ or organisers, only)", description="Please upload a photo proof", validators=[FileAllowed(['jpg', 'png'], 'JPG or PNG only, please.'))
proof = StringField("Evidence of being artist/ organiser", description="URL to your videos")
submit = SubmitField("Sign me up!")
我想做的是，如果以下三个中的任何一个：艺术家、组织者或dj被勾选为True，那么字段proof_photo和proof将成为必填字段。
我在下面尝试过，但不幸的是它不起作用，我不确定我做错了什么。
def authorisation_check(self):
if not super(RegisterForm, self).validate():
return False
if (self.artist.data == True or self.organiser.data == True or self.dj.data == True) and not (self.proof_photo.data and self.proof.data):
msg = 'Please submit your proof'
self.proof_photo.errors.append(msg)
self.proof.errors.append(msg)
return False
return True
如果有人可以帮助我解决这个问题，我将不胜感激:) 谢谢
在下面的示例中，我编写了两个接受依赖字段名称的自定义验证器。根据指定字段中的输入，执行验证并在必要时抛出错误。
from flask import (
Flask,
render_template
)
from flask_wtf import FlaskForm
from flask_wtf.file import FileField, FileAllowed, FileRequired
from wtforms import BooleanField, StringField, SubmitField
from wtforms.validators import DataRequired
app = Flask(__name__)
app.secret_key = 'your secret here'
class DependentFileRequired(FileRequired):
def __init__(self, fieldnames, message=None):
super().__init__(message)
self.fieldnames = fieldnames
self.field_flags = {}
def __call__(self, form, field):
if any(form[name].data and \
(not isinstance(form[name].data, str) or form[name].data.strip()) \
for name in self.fieldnames
):
super().__call__(form, field)
class DependentDataRequired(DataRequired):
def __init__(self, fieldnames, message=None):
super().__init__(message)
self.fieldnames = fieldnames
self.field_flags = {}
def __call__(self, form, field):
if any(form[name].data and \
(not isinstance(form[name].data, str) or form[name].data.strip()) \
for name in self.fieldnames
):
super().__call__(form, field)
class RegisterForm(FlaskForm):
artist = BooleanField("Are you an artist?", default=False)
organiser = BooleanField("Do you organise events?", default=False)
dj = BooleanField("Are you a DJ?", default=False)
proof_photo = FileField(
label="Upload proof photo (artists and/ or organisers, only)",
description="Please upload a photo proof",
validators=[
DependentFileRequired(fieldnames=['artist', 'organiser', 'dj']),
FileAllowed(['jpg', 'png'], 'JPG or PNG only, please.')
])
proof = StringField(
"Evidence of being artist/ organiser", #
description="URL to your videos",
validators=[
DependentDataRequired(fieldnames=['artist', 'organiser', 'dj'])
]
)
submit = SubmitField("Sign me up!")
@app.route('/register', methods=['GET', 'POST'])
def register():
form = RegisterForm()
if form.validate_on_submit():
print(form.data)
return render_template('register.html', **locals())
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Register</title>
</head>
<body>
<form method="post">
{{ form.hidden_tag() }}
<div>
{{ form.artist.label() }}
{{ form.artist() }}
</div>
<div>
{{ form.organiser.label() }}
{{ form.organiser() }}
</div>
<div>
{{ form.dj.label() }}
{{ form.dj() }}
</div>
<div>
{{ form.proof_photo.label() }}
{{ form.proof_photo() }}
{% if form.proof_photo.errors -%}
<ul>
{% for err in form.proof_photo.errors -%}
<li>{{ err }}</li>
{% endfor -%}
</ul>
{% endif -%}
</div>
<div>
{{ form.proof.label() }}
{{ form.proof() }}
{% if form.proof.errors -%}
<ul>
{% for err in form.proof.errors -%}
<li>{{ err }}</li>
{% endfor -%}
</ul>
{% endif -%}
</div>
{{ form.submit() }}
</form>
</body>
</html>