I would wait for the debate to settle before doing anything. At the moment much is unclear, a simple retract might be enough.

hi @marshall - i was wondering if any progress was made investigating multiple datomic cloud clients not fetching the latest version of the database using d/db without first "updating" the connection with a bogus call to d/q? https://stackoverflow.com/questions/50347307/how-do-i-keep-two-datomic-cloud-clients-in-sync

maybe there's an issue we can track? 🙂 we've had to build a phantom query into our API library that gets called every time before a pull is performed (with the other option being to reconnect before each query).

Hi i just accidentally called retractEntity on half my development database without making a backup. Is it possible to undo all that ? I can ditch all transactions that happened since that transaction.

you can take the set of datoms from that last transaction (use the log API to get the last transaction)

and then “reverse” them

i.e. change all assertions to retractions and retractions to assertions

sweet 🙂

https://stackoverflow.com/questions/25389807/how-do-i-undo-a-transaction-in-datomic @jdkealy

wow holy shit that was easy 🙂

What's the most natural way to store an array of entities in Datomic? I'm trying to come up with a way to model a manually sorted list of items. First I thought giving every item a "sort id" integer that can be adjusted when a user drags and drops it, but I can't see how to painlessly deal with "no more integers between two items you're trying to drop your item between".

You can either do ordinals for indexing or a linked list approach

Both have pros and cons

Seems to be a FAQ 🙂

@alexmiller Thanks

@dottedmag https://github.com/vvvvalvalval/datofu supports ordinals and https://github.com/dwhjames/datomic-linklist does linked list. I have been using linked-list but it makes datalog queries tricky so I’ll probably switch to ordinals soon

Is there a secret Javascript datomic client that it is possible to get access to?