Python Flask 中路由函數中的參數問題

Question

我的 tabort 函數中需要有兩個參數，但它一直說缺少 1 個必需的位置參數。 我不知道如何處理它，我在那里有兩個，但它仍然說缺少一個。 有人可以幫我解決這個問題嗎？

@app.route('/tabort/<int:id>', methods=['GET', 'POST'])
def tabort(id,username):
    """
    Delete the item in the database that matches the specified
    id in the URL
    """
    qry = db_session.query(Matrial).filter(
        Matrial.id==id)
    matrial = qry.first()

    if matrial:
        form = MatrialForm(formdata=request.form, obj=matrial)
        if request.method == 'POST' and form.validate():
            # delete the item from the database
            db_session.delete(matrial)
            db_session.commit()

            flash('Artikel togs bort!')
            return redirect(url_for("user_home", username=username))
        return render_template('tabort_artikel.html', form=form)
    else:
        return 'Något gick fel #{id}'.format(id=id)

Traceback (most recent call last)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\_compat.py", line 35, in reraise
raise value
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\xzenon\AppData\Local\Programs\Python\Python37-32\lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
TypeError: tabort() missing 1 required positional argument: 'username'

Answer 1

@app.route('/tabort/<int:id>', methods=['GET', 'POST'])
def tabort(id,username):

您的路徑中有<int: id> 。 因此，flask 將從路徑中解析一個 id 整數並將其傳遞給您的函數。 但是你的函數正在尋找兩個參數，id 和 username，而路由器只傳遞一個。 從您的參數列表中刪除username ，或將<username>添加到路徑中的某處。

Answer 2

在您的代碼中，您正在構建如下 URL：

@app.route('/tabort/<int:id>', methods=['GET', 'POST'])
def tabort(id,username):

URL 只接受一個參數，但該方法需要兩個參數，你就錯了。

為了向方法發送兩個參數，您還需要向 URL 發送 2 個參數，如下所示：

@app.route('/tabort/<int:id>/<string:username', methods=['GET', 'POST'])
def tabort(id,username):

我希望這有幫助。