Do not allow more than one seqfile per plasmid

In edit mode, we can select several seqfiles for a given plasmid. This is a source of bugs and misfunction and therefore not acceptable. A single file should be permitted.

added bug code-quality essential labels

changed the description

changed milestone to %v2.1

assigned to @gyvert

Here is the stored string in an example of two seqfiles uploaded:

[{"download_link":"plasmids/seqfilesv1/pGY5.gb","original_name":"pGY5.gb"},{"download_link":"plasmids/February2022/U1lBekcP371DdDIZ2jKX.gb","original_name":"pGY674.gb"}]

We can consider looking for the occurrence of download_link and verify that it is unique.

Probably better: use a custom view for the formfield; or a custom formfield where we deal with cases of multiple entries.

mentioned in issue #151 (closed)

marked this issue as related to #151 (closed)

mentioned in commit 8ed37e97

Fixed by customizing the formfield's view.

closed