我正在嘗試在 FLASK 和 html 頁面中創建函式以允許用戶相互評分 - 一個用戶可以給另一個用戶評分，但我收到此錯誤：jinja2.exceptions.UndefinedError: 'to_user' is undefined。有誰知道，請問如何解決？
@app.route('/user/<int:id>/add-rating/', methods=['GET', 'POST'])
def rating(id):
form = RatingForm()
if form.validate_on_submit():
from_user = current_user.id
to_user = Users.query.get_or_404(id)
content = form.content.data
rating = Ratings(from_user = from_user, to_user = to_user, content = content)
db.session.add(rating)
db.session.commit()
flash(' posted')
return render_template('add_rating.html', form=form)
class Ratings(db.Model):
id = db.Column(db.Integer, primary_key=True)
content = db.Column(db.Text)
from_user = db.Column(db.Integer, db.ForeignKey('users.id'))
to_user = db.Column(db.Integer, db.ForeignKey('users.id'))
{% if current_user.is_authenticated %}
<h1>Ohodnotit u?ivatele {{to_user.username}}</h1>
<br/>
<div class="shadow p-3 mb-5 bg-body rounded">
<form method="POST">
{{ form.hidden_tag() }}
{{ form.content.label() }}
{{ form.content(, rows="5") }}
<br/>
{{ form.submit() }}
</form>
</div>
{% else %}
<h1>Abys mohl ohodnotit u?ivatele, musí? byt p?ihá?en</h1>
<h2><a href="{{url_for('login')}}"> P?ihlas se zde</a></h2>
{% endif %}
uj5u.com熱心網友回復：
首先，您需要加載to_user變數并將其傳遞給模板：
@app.route('/user/<int:id>/add-rating/', methods=['GET', 'POST'])
def rating(id):
to_user = Users.query.get_or_404(id)
form = RatingForm()
if form.validate_on_submit():
from_user = current_user.id
content = form.content.data
rating = Ratings(from_user = from_user, to_user = to_user, content = content)
db.session.add(rating)
db.session.commit()
flash(' posted')
return render_template('add_rating.html', form=form, to_user=to_user)
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