Item transformer doesn't load all child derived bioassays in some cases

[Nicklas Nordborg]

We noticed a situation for the CopyNumber (derived bioassay) items which have two derived bioassay parents (AlignedSequences). The two parents are one with pipeline=DNA/Normal/WGS and one with pipeline=DNA/Tumor/WGS and they both have parent Libraries (extract).

We added a column to the derived bioassay table that display the pipeline of the parent Library item. When the table was filtered to only display CopyNumber items it was only possible to filter on the Library pipeline when selecting the DNA/Tumor/WGS value. When selecting the DNA/Normal/WGS value the filter returned no results.

The issue is probably that the CopyNumber item has a direct link to the tumor library, but to reach the normal library we need to move up to the normal alignment which has a link to the normal library. When filtering on AlignedSequences instead the Library pipeline filter works as expected.

Note that it is only the filtering that doesn't work. The column will display both parent libraries.

[Nicklas Nordborg]

In 8172:

Fixes #2313: Item transformer doesn't load all child derived bioassays in some cases