[GitHub] [airflow] frnidito opened a new issue #9060: Connection support for repeated extra fields

[GitBox]

frnidito opened a new issue #9060:
URL: https://github.com/apache/airflow/issues/9060


   **Description**
   
   The `Connection` object should be able to support repeated keys in the extra 
fields.
   
   **Use case / motivation**
   
   Some connections strings, for instance the one used by MongoDB, support the 
repetition of keys such as in setting the rules for the precedence in choosing 
data-centres:
   
   
`mongodb://mongos1.example.com,mongos2.example.com/?readPreference=secondary&readPreferenceTags=dc:ny,rack:r1&readPreferenceTags=dc:ny&readPreferenceTags=`
   
   At the moment, there is no way to set this in the Connection neither though 
the UI nor using the CLI.
   ```
   >>> from airflow.models.connection import Connection
   >>> c = 
Connection(uri='my-conn-type://my-login:my-password@my-host:5432/my-schema?param1=val1&param2=val2')
   >>> c.extra
   '{"param1": "val1", "param2": "val2"}'
   >>> c.set_extra('{"param1": "val1", "param1": "val2"}')  # <- here
   >>> c.get_uri()
   'my-conn-type://my-login:my-password@my-host:5432/my-schema?param1=val2'
   ```
   
   Adding support to this, maybe with an array form in the JSON would be ideal, 
i.e., being able to write something like:
   ```
   >>> c.set_extra('{"param1": ["val1", "val2"]}')
   >>> c.get_uri()
   
'my-conn-type://my-login:my-password@my-host:5432/my-schema?param1=val1&param1=val2'
   ```


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