zachliu commented on issue #12489:
URL: https://github.com/apache/airflow/issues/12489#issuecomment-730607720
@jrd281 lol, you beat me to it :joy:
let me add that this :bug: is also in `2.0.0b3`
```
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Python version: 3.8.6
Airflow version: 2.0.0b3
Node: <Of Course I Still Love You>
-------------------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2447, in
wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1952, in
full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1821, in
handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.8/site-packages/flask/_compat.py", line 39,
in reraise
raise value
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1950, in
full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1936, in
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/security/decorators.py",
line 109, in wraps
return f(self, *args, **kwargs)
File "/usr/local/lib/python3.8/site-packages/flask_appbuilder/views.py",
line 606, in edit
return self.render_template(
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/baseviews.py", line
280, in render_template
return render_template(
File "/usr/local/lib/python3.8/site-packages/flask/templating.py", line
137, in render_template
return _render(
File "/usr/local/lib/python3.8/site-packages/flask/templating.py", line
120, in _render
rv = template.render(context)
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line
1090, in render
self.environment.handle_exception()
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line
832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/usr/local/lib/python3.8/site-packages/jinja2/_compat.py", line 28,
in reraise
raise value.with_traceback(tb)
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html",
line 2, in top-level template code
{% import 'appbuilder/general/lib.html' as lib %}
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/base.html",
line 1, in top-level template code
{% extends base_template %}
File
"/usr/local/lib/python3.8/site-packages/airflow/www/templates/airflow/master.html",
line 20, in top-level template code
{% extends 'appbuilder/baselayout.html' %}
File
"/usr/local/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
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/init.html",
line 46, in top-level template code
{% block body %}
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/baselayout.html",
line 19, in block "body"
{% block content %}
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html",
line 23, in block "content"
{% block edit_form %}
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/model/edit.html",
line 25, in block "edit_form"
{{ widgets.get('edit')(form_action=form_action)|safe }}
File "/usr/local/lib/python3.8/site-packages/flask_appbuilder/widgets.py",
line 37, in __call__
return template.render(args)
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line
1090, in render
self.environment.handle_exception()
File "/usr/local/lib/python3.8/site-packages/jinja2/environment.py", line
832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/usr/local/lib/python3.8/site-packages/jinja2/_compat.py", line 28,
in reraise
raise value.with_traceback(tb)
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/widgets/form.html",
line 45, in top-level template code
{{ lib.render_field(field, begin_sep_label, end_sep_label,
begin_sep_field, end_sep_field) }}
File "/usr/local/lib/python3.8/site-packages/jinja2/runtime.py", line 679,
in _invoke
rv = self._func(*arguments)
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/templates/appbuilder/general/lib.html",
line 237, in template
{{ field(**kwargs)|safe }}
File "/usr/local/lib/python3.8/site-packages/wtforms/fields/core.py", line
160, in __call__
return self.meta.render_field(self, kwargs)
File "/usr/local/lib/python3.8/site-packages/wtforms/meta.py", line 56, in
render_field
return field.widget(field, **render_kw)
File
"/usr/local/lib/python3.8/site-packages/flask_appbuilder/fieldwidgets.py", line
176, in __call__
return super(Select2ManyWidget, self).__call__(field, **kwargs)
File "/usr/local/lib/python3.8/site-packages/wtforms/widgets/core.py",
line 300, in __call__
for val, label, selected in field.iter_choices():
File "/usr/local/lib/python3.8/site-packages/flask_appbuilder/fields.py",
line 209, in iter_choices
yield (pk, self.get_label(obj), obj in self.data)
TypeError: argument of type 'DagRun' is not iterable
```
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