Question

我有一个问题。我正在使用flask创建搜索结果。它工作正常，但是当我尝试使用页面导航导航到下一页，它显示错误：

'TypeError：视图函数未返回有效响应。该函数返回None或不返回return语句而结束。我究竟做错了什么？代码如下所示：

@main.route("/filter", methods=['GET', 'POST'])
def filter():  

    if request.method == 'GET':
        #page = request.args.get('page', 1, type=int) 

        search_value = request.args.get('search')
        filter0 = "%{0}%".format(search_value)
        filter1 = request.args.get('myselect')
        filter2 = request.args.get('myselect2')
        if filter1 == 'new':

            if filter2 == "All":
                page = request.args.get('page', 1, type=int) 
                posts = Post.query.filter(Post.course_name.like(filter0)).filter_by().order_by(Post.timestamp.desc()).paginate(page=page, per_page=10)
            return render_template('home.html', posts=posts, filter1 = filter1, filter2 = filter2)

        {% for page_num in posts.iter_pages(left_edge=1, right_edge=1, left_current=1, right_current=2) %}
          {% if page_num %}
            {% if posts.page == page_num %}
              <a class="btn btn-info mb-4" href="{{ url_for('main.filter', page=page_num) }}">{{ page_num }}</a>
            {% else %}
              <a class="btn btn-outline-info mb-4" href="{{ url_for('main.filter', page=page_num) }}">{{ page_num }}</a>
            {% endif %}
          {% else %}
            ...
          {% endif %}
        {% endfor %}

Answer 1

if filter1 != 'new'，视图函数什么也不返回，

以下代码可以解决此问题

@main.route("/filter", methods=['GET', 'POST'])
def filter():  

    if request.method == 'GET':
        pass
        if filter1 == 'new':
            if filter2 == "All":
               pass
            return render_template('home.html', posts=posts, filter1 = filter1, filter2 = filter2)
    return 'something'

使用烧瓶问题分页搜索结果

1 个答案: