Feature/csckan-277

[D-GopalKrishna]

Jira Link - https://metacell.atlassian.net/browse/SCKAN-277

Implementation/Requirements :

• show AE name instead of synonyms in Connected From
• show (region, layer) uri in identifier when it is RegionLayer AE

When the destination is one of RegionLayer AE, it shows as -> Region, Layer in the "Connected from". This is since RegionLayerPair is also AnatomicalEntity.

@ddelpiano thoughts?

When origin is a RegionLayer AE, the identifier is a pair separated by a comma. uri for - region, layer

[D-GopalKrishna]

Simplification of the code in the image - valid, since we have a code for constraint already in place as following

    class Meta:
        constraints = [
            CheckConstraint(
                check=(
                        Q(simple_entity__isnull=False, region_layer__isnull=True) |
                        Q(simple_entity__isnull=True, region_layer__isnull=False)
                ),
                name='check_anatomical_entity_exclusivity'
            )
        ]

by @afonsobspinto

So we never have the condition for the "else". Also the region and layer have required conditions.