patchandpray commented on issue #12489: URL: https://github.com/apache/airflow/issues/12489#issuecomment-737027781
Hi, I think I need some help. I have been able to deduce that the issue arises upon form autogeneration for a taskinstance by flask-appbuilder. When editing a taskinstance. A taskinstance appears to have a one on one relationship with a DagRun and when generating the edit form flask_appbuilder uses `QuerySelectMultipleField.iter_choices()` which gets called with: `<DagRun example_bash_operator @ 2020-11-29 00:00:00+00:00: scheduled__2020-11-29T00:00:00+00:00, externally triggered: False>`. Since this is a non-iterable object the exception is raised. When using `QuerySelectField.iter_choices()` with this object the form does generate but I am stuck finding a way to force this behavior from airflow code. An option might be to not autogenerate a form and specify a form for taskinstance edit so we can explicitly define which fields to use but I am unsure if this is the correct way to implement a fix for this. Also, how is determined which fields are generated for this form? Furthermore when forcing the generation from flask_appbuilder and generating a form:  when trying to save a modification for a taskinstance I am presented with this error. I want to create a new bug report for this but it might be related to this bug.  ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
