Allow Sampling of bulked observation units

[daveneti]

Allow a sample to be taken from two or more biological sources for example leaves or seed etc, and sample these together as one. Does not cover the case where existing samples are combined in form a new pooled/bulk sample, this is covered in Issue 573. Nor does it allow for recording the relative contribution to the sample mixture from each source, which is also covered in Issue 573.

Use Cases

• Bulked segregant analysis for material coming from a group of germplasm (related or not) with the same phenotypic trait.
• Impurity or contamination testing of pooled/bulked material to reduce costs by testing en masse for infrequent/unexpected alleles.

Implementation

1. Add the property observationUnitsDbIds with the following schema to SampleNewRequest:

      observationUnitsDbIds:
        description: The DbIds of the Observation Units from which material was taken to create this sample
        items:
          type: string
        type: array
   

2. Depreciate the observationUnitDbId property

3. When the Observation Units are taken from different Germplasm, then the germplasmDbId property would be null.