Flask App Builder在数组上引发KeyError

如何解决Flask App Builder在数组上引发KeyError

我有一个表，其属性类型为字符串数组：

create table mytable(
        suffix VARCHAR(200) PRIMARY KEY,label VARCHAR(200) NOT NULL,sourceuris VARCHAR(200)[],);

在models.py中定义为：

class mytable(Model):
    suffix = Column(String(200),primary_key=True)
    label =  Column(String(200),nullable=False)
    sourceuris = Column(ARRAY(String(200)))

    def __repr__(self):
        return self.label

现在，我想在views.py中使用Flask AppBuilder在其上定义视图：

class mytable(ModelView):
    datamodel = SQLAInterface(mytable)                                                                                                                                                                                                                                                                       
    label_columns = {'label':'Name'}
    list_columns = ['suffix','label','sourceuris']

它可以编译，但是当我在http://127.0.0.1:5000/mytableviewview/list/的Web应用程序中打开视图时，我得到一个`KeyError：'sourceuris'：

2020-08-26 12:50:42,329:WARNING:flask_appbuilder.models.filters:Filter type not supported for column: sourceuris
2020-08-26 12:50:42,332:WARNING:flask_appbuilder.models.filters:Filter type not supported for column: sourceuris
2020-08-26 12:50:42,394:ERROR:app:Exception on /mytableview/list/ [GET]
Traceback (most recent call last):
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/app.py",line 2447,in wsgi_app
    response = self.full_dispatch_request()
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/app.py",line 1952,in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/app.py",line 1821,in handle_user_exception
    reraise(exc_type,exc_value,tb)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/_compat.py",line 39,in reraise
    raise value
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/app.py",line 1950,in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/app.py",line 1936,in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/security/decorators.py",line 109,in wraps
    return f(self,*args,**kwargs)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/views.py",line 552,in list
    return self.render_template(
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/baseviews.py",line 280,in render_template
    return render_template(
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/templating.py",line 137,in render_template
    return _render(
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask/templating.py",line 120,in _render
    rv = template.render(context)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/jinja2/environment.py",line 1090,in render
    self.environment.handle_exception()
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/jinja2/environment.py",line 832,in handle_exception
    reraise(*rewrite_traceback_stack(source=source))
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/jinja2/_compat.py",line 28,in reraise
    raise value.with_traceback(tb)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/list.html",line 2,in top-level template code
    {% import 'appbuilder/general/lib.html' as lib %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/base.html",line 1,in top-level template code
    {% extends base_template %}
  File "/home/konrad/projekte/hito/database-frontend/app/templates/base.html",in top-level template code
    {% extends 'appbuilder/baselayout.html' %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html",in top-level template code
    {% import 'appbuilder/baselib.html' as baselib %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/init.html",line 46,in top-level template code
    {% block body %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html",line 19,in block "body"
    {% block content %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/list.html",line 7,in block "content"
    {% block list_search scoped %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/list.html",line 8,in block "list_search"
    {% call lib.accordion_tag("accordion1",_("Search"),False) %}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/jinja2/runtime.py",line 679,in _invoke
    rv = self._func(*arguments)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/lib.html",line 291,in template
    {{ caller() }}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/jinja2/runtime.py",in _invoke
    rv = self._func(*arguments)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/list.html",line 9,in template
    {{ widgets.get('search')()|safe }}
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/flask_appbuilder/widgets.py",line 114,in __call__
    label_columns[col] = as_unicode(self.template_args["form"][col].label.text)
  File "/home/konrad/projekte/hito/database-frontend/venv/lib/python3.8/site-packages/wtforms/form.py",line 64,in __getitem__
    return self._fields[name]
KeyError: 'sourceuris'

即使我从list_columns数组中删除“ sourceuris”，错误仍然存​​在。

如何让Flask AppBuilder正确显示数组？

编辑：我实现了@mehdy的建议，但是创建不起作用，并且在编辑时我无法更改数组的大小。请参见下面的屏幕截图：

查看

查看正常。

编辑

仅当数组大小保持不变时，编辑才有效。

创建

创建不起作用，因为数组最初是空的，而且我无法将大小增加到一个元素。

请注意，在实际情况下，该数组称为“同义词”，而不是最小示例中的“ sourceuris”。

解决方法

该问题是由search表单字段引起的。为避免这种情况，您可以按照以下方式从sourceuris表单字段中排除search。

    search_exclude_columns = ['sourceuris']

但是，由于Flask-AppBuilder不支持Array字段，因此您还必须将这些字段添加到属性中才能使其正常工作。

from wtforms import FieldList,StringField

add_form_extra_fields = {'sourceuris': FieldList(StringField('Source URIs'),min_entries=1)}
edit_form_extra_fields = {'sourceuris': FieldList(StringField('Source URIs'),min_entries=1)}

这三个属性都必须添加到您的ModelView类中。