python - Flask App Builder 在数组上抛出 KeyError

Question

我有一个带有字符串数组类型属性的表:

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

它在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 定义一个 View :

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 View 时，我收到一个 `KeyError: 'sourceuris':

2020-08-26 12:50:42,329:WARNING:flask_appbuilder.models.filters:Filter type not supported for column: sourceuris
2020-08-26 12:50:42,329: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", line 1, 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", line 2, 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", 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/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 显示数组而不出现错误？

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。请参阅下面的屏幕截图:

查看

观看效果良好。

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，实际情况中的数组称为“同义词”，而不是最小示例中的“sourceuris”。

Answer 1

该问题是由搜索表单字段引起的。为了避免这种情况，您可以从 search 表单字段中排除 sourceuris，如下所示。

    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)}

所有这三个属性都必须添加到您的 ModelView 类中。