Python 带有多个参数的 Flask url_for()

Flask url_for() with multiple parameters

提问by agconti

The Problem:

问题：

I have an a input button in a form that when its submitted should redirect two parameters , search_valand i, to a more_results()function, (listed below), but I get a type error when wsgi builds.

我有一个表单中的输入按钮，当它提交时应该将两个参数 ,search_val和i,重定向到一个more_results()函数（如下所列），但是在构建 wsgi 时出现类型错误。

The error is: TypeError: more_results() takes exactly 2 arguments (1 given)

错误是： TypeError: more_results() takes exactly 2 arguments (1 given)

html:

html：

 <form action="{{ url_for('more_results', past_val=search_val, ind=i ) }}" method=post>
    <input id='next_hutch' type=submit value="Get the next Hunch!" name='action'>
 </form>

flask function:

烧瓶功能：

@app.route('/results/more_<past_val>_hunches', methods=['POST'])
def more_results(past_val, ind):

    if request.form["action"] == "Get the next Hunch!":
        ind += 1 
        queried_resturants = hf.find_lunch(past_val) #method to generate a list
        queried_resturants = queried_resturants[ind]
        return render_template(
                               'show_entries.html', 
                                queried_resturants=queried_resturants, 
                                search_val=past_val,
                                i=ind 
                               )

Any idea on how to get past the build error?

关于如何克服构建错误的任何想法？

What I've tried:

我试过的：

Creating link to an url of Flask app in jinja2 template

在 jinja2 模板中创建指向 Flask 应用程序 url 的链接

for using multiple paramters with url_for()

用于在 url_for() 中使用多个参数

Build error with variables and url_for in Flask

在 Flask 中使用变量和 url_for 构建错误

similar build erros

类似的构建错误

As side note, the purpose of the function is to iterate through a list when someone hits a "next page" button. I'm passing the variable iso I can have a reference to keep incrementing through the list. Is there a flask / jinja 2 method that would work better? I've looked into the cycling_list feature but it doesn't seem to able to be used to render a page and then re-render it with cycling_list.next().

作为旁注，该函数的目的是在有人点击“下一页”按钮时遍历列表。我正在传递变量，i所以我可以有一个引用来在列表中不断增加。有没有更好的烧瓶/jinja 2 方法？我已经研究了cycling_list 功能，但它似乎无法用于渲染页面，然后使用cycling_list.next().

采纳答案by Amber

Your route doesn't specify how to fill in more than just the one past_valarg. Flask can't magically create a URL that will pass two arguments if you don't give it a two-argument pattern.

您的路线没有指定如何填写不仅仅是一个past_val参数。如果你不给它一个双参数模式，Flask 不能神奇地创建一个将传递两个参数的 URL。

回答by plaes

It's also possible to create routes that support variable number of arguments, by specifying default values to some of the arguments:

通过为某些参数指定默认值，还可以创建支持可变数量参数的路由：

@app.route('/foo/<int:a>')
@app.route('/foo/<int:a>/<int:b>')
@app.route('/foo/<int:a>/<int:b>/<int:c>')
def test(a, b=None, c=None):
   pass