1 回答

TA貢獻1921條經驗 獲得超9個贊
嘗試在 HTML 表單中刪除更改表單的操作。
<form action="" method="post">
{{ form.hidden_tag() }}
{{ form.csrf_token }}
<div class="row">
<div class="form-group col">
{{ form.from_location.label(class="form-control-label") }}
{{ form.from_location(class="form-control form-control-lg") }}
</div>
<div class="form-group col">
{{ form.to_location.label(class="form-control-label") }}
{{ form.to_location(class="form-control form-control-lg") }}
</div>
</div>
<div class="row">
<div class="form-group col">
{{ form.product.label(class="form-control-label") }}
{{ form.product(class="form-control form-control-lg") }}
</div>
<div class="form-group col">
{{ form.quantity.label(class="form-control-label") }}
{{ form.quantity(class="form-control form-control-lg") }}
</div>
</div>
<div class="form-group">
{{ form.add_movement(class="btn btn-outline-info") }}
</div>
</form>
這能解決問題嗎?
此外,我建議您將 Flash 消息添加到 HTML 中,因為我看到一旦提交表單,它就會返回到“add_movements”函數。因此添加:
<div>
{% for msg in get_flashed_messages%}
<h1>{{msg}}</h1>
{% endfor %}
</div>
<form action="" method="post">
{{ form.hidden_tag() }}
{{ form.csrf_token }}
<div class="row">
<div class="form-group col">
{{ form.from_location.label(class="form-control-label") }}
{{ form.from_location(class="form-control form-control-lg") }}
</div>
<div class="form-group col">
{{ form.to_location.label(class="form-control-label") }}
{{ form.to_location(class="form-control form-control-lg") }}
</div>
</div>
<div class="row">
<div class="form-group col">
{{ form.product.label(class="form-control-label") }}
{{ form.product(class="form-control form-control-lg") }}
</div>
<div class="form-group col">
{{ form.quantity.label(class="form-control-label") }}
{{ form.quantity(class="form-control form-control-lg") }}
</div>
</div>
<div class="form-group">
{{ form.add_movement(class="btn btn-outline-info") }}
</div>
#編輯
我注意到一旦強制丟失,產品字段中就缺少了一些東西:
class MovementForm(FlaskForm):
to_location = SelectField('To Location', coerce=int)
from_location = SelectField('From Location', coerce=int)
product = SelectField('Product', coerce=int)
quantity = IntegerField('Quantity')
add_movement = SubmitField('Add Movement')
編輯#2
如果您遇到此類問題(這種情況經常發生),我建議您也添加打印語句和 If/Else 子句。這將極大地幫助您解決問題所在(您發布的問題類型的問題是您“看不到”)并且會給您“眼睛”。
例如,這就是我會做的:
@app.route('/movements',methods=["GET","POST"])
def add_movements():
form = MovementForm()
form.to_location.choices = [(location.id, location.location_name) for
location in Location.query.all()]
form.from_location.choices = [(location.id, location.location_name)
for location in Location.query.all()]
form.product.choices = [(product.id, product.product_name) for product
in Product.query.all()]
form.from_location.choices.insert(0, (0, 'None'))
if form.validate_on_submit():
print('Form Ok') #if you see the 'Form ok' to see if is validated
new_movement = Movement(to_location_id=form.to_location.data,
from_location_id=form.from_location.data,
product_id=form.product.data, quantity=form.quantity.data)
db.session.add(new_movement)
db.session.commit()
flash('Product has been moved!', 'success')
return redirect(url_for('add_movements'))
else:
print('Form Not Ok') #If you see this printed then you see that
#is not validated
return render_template('add_movements.html', form=form)
添加回答
舉報