Segregate Entities from array of Entity data

Question

Yeloow, 
 
 I am currently working in a use case, 
 I have an array of Entity data where entites from different datastores will be inside this array, 
 I want to segregate or group the entities by their datastore so I noticed one thing while trying this out, 
 
 [Data Store Entity:"xxxxxxxxx-xxxxxxxxf-9143-xxxxx8c102b00@ 4872 "] (Data Store Entity)

[Data Store Entity:"xxxxxxxxx-xxxxx-43a9-a20d-3xxxx744b9aae@ 4872 "] (Data Store Entity)

[Data Store Entity:"xxxxxxxxxx-xxxxx-4adc-b46f-axxxxa5990bd@ 6308 "] (Data Store Entity)

[Data Store Entity:"xxxxxxxxxx-xxxxxxx-4c81-9ddc-axxxx0d18e9@ 6308 "] (Data Store Entity) 
 
 after the @ every entities belong to same Datastore have the same 4 digit number so I assume entites belong to same Data store have these 4 digit number common, is my assumption right ? can any Appian legend confirm this .

Chris · Answer

It is my understanding that those @ values will remain consistent within the same environment, for any Data Entity under the same Data Source . But, those Entities under the Data Source can have different structures, so grouping on this value may not provide benefit depending on your needs. Essentially, this is just a reference # for which Data Store the Entity resides under: 
 
 [Data Store Entity:" DATA_ENTITY_UUID @ PARENT_DATA_STORE_REFERENCE "] (Data Store Entity) 
 
 But, this reference # is neither the ID or UUID of the parent Data Store. In my environment, one reference is "xyx@ 5 1776 " where the Data Store ID is " 500113 " and UUID is " _a-0000dc00-xyz.. " 
 But, if it helps for your needs, you can extract either part of the string to retrieve the Entity UUID or Parent Data Store Reference (which does not link directly to a DS, AFAIK).. 
 a!flatten(
 a!forEach(
 items: local!entities,
 /*expression: extract(tostring(fv!item),"@","""")*/ /* Uncomment for DS reference # */
 expression: extract(tostring(fv!item),"","@") /* Entity UUID */
 )
 ) 
 You will note that if you search for the reference number in /design by ID or UUID, within an application that the DS resides, it is returned. However, if you search the overall /design environment objects for this reference #, it is NOT returned (tested on Appian 24.1).