Could not build url for endpoint 'xxx'. Did you forget to specify values ['xxx']?

最近在使用Flask的时候报如下错误：

werkzeug.routing.BuildError

出错原因：

未查明。

解决方案：

在网上也没有找到很好的答案，经过不断摸索，终于解决问题。

视图代码：

@manage.route('/admin_edit_classification/<int:classification_id>', methods=['GET', 'POST'])
@login_required
@admin_required
def admin_edit_classification(classification_id):
    # get classification item
    classification_item = MaterialClassification.query.filter_by(id=classification_id).first()
    # 获取当前用户id
    user_id = current_user.id
    # 页面信息
    user_info = User.query.get_or_404(user_id)
    title = '首 页'
    page_name = 'Dashboard'
    page_features = 'dashboard & statistics'
    # get classification tables
    get_classification_material = MaterialClassification.query.all()
    # form
    form = AddClassificationForm()
    form.classification_name.data = classification_item.classification_name
    form.classification_icon.data = classification_item.classification_icon
    form.classification_icon.id = classification_item.id
    return render_template('manage/admin_edit_classification.html', user_info=user_info, name=title,
                           pageName=page_name, description=page_name, pageFeatures=page_features,
                           classification_lists=get_classification_material, form=form,classification_item=classification_item)

这些代码也没有什么问题。

这是一个通过列表，修改内容的页面，通过传递需要修改的Id，到达修改页面。

之后看了一下前端代码：

<form action="{{ url_for('.admin_edit_classification') }}" method="post" role="form" enctype="multipart/form-data"/>
{{ form.csrf_token }}
<div class="form-group">
    {{ form.classification_name.label(class='control-label',for='default') }}
    {{ form.classification_name(class='form-control',placeholder='Placeholder text',id='default') }}
</div>
<div class="form-group">
    {{ form.classification_icon.label(class='control-label',for='default') }}
    <div class="fileinput fileinput-new" data-provides="fileinput">
        <div class="input-group">
            <div class="form-control uneditable-input input-fixed" data-trigger="fileinput">
                <i class="fa fa-file fileinput-exists"></i>&nbsp;
                <span class="fileinput-filename"> </span>
            </div>
            <span class="input-group-addon btn default btn-file">
                        <span class="fileinput-new"> Select file </span>
                        <span class="fileinput-exists"> Change </span>
                    {{ form.classification_icon() }}
                </span>
            <a href="javascript:;" class="input-group-addon btn red fileinput-exists"
               data-dismiss="fileinput"> Remove </a>
        </div>
    </div>
</div>
<div class="form-group">
    {{ form.submit(class='btn green') }}
</div>
</form>

似乎也没有什么问题，之后再看看报错内容：

• File "E:\Python\Material prices\app\templates\manage\admin_edit_classification.html", line 43, in block "content"

  <form action="{{ url_for('.admin_edit_classification') }}" method="post" role="form" enctype="multipart/form-data"/>

• File "E:\Python\Material prices\venv\lib\site-packages\flask\helpers.py", line 356, in url_for

  return appctx.app.handle_url_build_error(error, endpoint, values)

• File "E:\Python\Material prices\venv\lib\site-packages\flask\app.py", line 2061, in handle_url_build_error

  reraise(exc_type, exc_value, tb)

• File "E:\Python\Material prices\venv\lib\site-packages\flask\_compat.py", line 35, in reraise

  raise value

• File "E:\Python\Material prices\venv\lib\site-packages\flask\helpers.py", line 345, in url_for

  force_external=external)

• File "E:\Python\Material prices\venv\lib\site-packages\werkzeug\routing.py", line 1776, in build

  raise BuildError(endpoint, values, method, self)

werkzeug.routing.BuildError: Could not build url for endpoint 'manage.admin_edit_classification'. Did you forget to specify values ['classification_id']?

确定还是上面的form表单存在问题。

经过不断研究，修改代码：

<form action="{{ url_for('.admin_edit_classification',classification_id = form.classification_icon.id) }}" method="post" role="form" enctype="multipart/form-data"/>
{{ form.csrf_token }}
<div class="form-group">
    {{ form.classification_name.label(class='control-label',for='default') }}
    {{ form.classification_name(class='form-control',placeholder='Placeholder text',id='default') }}
</div>
<div class="form-group">
    {{ form.classification_icon.label(class='control-label',for='default') }}
    <div class="fileinput fileinput-new" data-provides="fileinput">
        <div class="input-group">
            <div class="form-control uneditable-input input-fixed" data-trigger="fileinput">
                <i class="fa fa-file fileinput-exists"></i>&nbsp;
                <span class="fileinput-filename"> </span>
            </div>
            <span class="input-group-addon btn default btn-file">
                        <span class="fileinput-new"> Select file </span>
                        <span class="fileinput-exists"> Change </span>
                    {{ form.classification_icon() }}
                </span>
            <a href="javascript:;" class="input-group-addon btn red fileinput-exists"
               data-dismiss="fileinput"> Remove </a>
        </div>
    </div>
</div>
<div class="form-group">
    {{ form.submit(class='btn green') }}
</div>
</form>

更改了form的url，后面加了参数id，最后问题终于解决。

个人感觉应该是需要修改的form表单url有问题，例如：

传过来需要修改的url:http://xxx.com/list/1

修改页面的表单url:http://xxx.com/edit/1，而不能是：http://xxx.com/edit/。

好了，问题解决。

黄兵个人博客原创。

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