Fix meeting_id not filled in ballot

[bastianjoel]

Meeting id now needs to be added to ballot because of the newly added equalfields constraints.

Go downgraded to align with other services.

[bastianjoel]

When finalizing a secret approval poll I get following error:
Error: bulk inserting anonymized ballots: ERROR: null value in column "meeting_id" of relation "ballot_t" violates not-null constraint (SQLSTATE 23502)

[ostcar]

I don't get the constrain. I don't see, that the vote logic needs this field. Why does the DB?

[bastianjoel]

ballot.yaml:

  poll_id:
    type: relation
    reference: poll
    to: poll/ballot_ids
    equal_fields: meeting_id
    required: true
    restriction_mode: A
    constant: true

Because of the equal_fields: meeting_id

[ostcar]

Could we remove that? I don't see, why we need this constrain? See also OpenSlides/openslides-meta#498

[ostcar]

Please explain to me first, why the meeting_ids field in the ballot collection is necessary

[bastianjoel]

Yes, removing that constraint would work too.

[bastianjoel]

Not needed anymore OpenSlides/openslides-meta#500