datomic 2021-02-10 | Slack Archive

hadils16:02:11

I am setting up WebSockets for my app with lambda functions. Which is more appropriate: DynamoDB or datomic cloud (which I am using for my database) with noHistory turned on?

joshkh17:02:55

i used Datomic Cloud with noHistory because it was easiest (for me) to store values in a database without having to coerce data types, for example UUIDs. DDB gives me a headache. it sounds like you're well on your way, but in case it helps i have an example project that handles multiple clients/sessions per database user via the AWS API Gateway. the docs are half baked though. https://github.com/joshkh/datomic-ions-websockets

hadils17:02:12

Thank you @U0GC1C09L !

joshkh17:02:34

sure! starting from scratch, it took me a little bit of trial-and-error to understand how everything connects, so if you have any questions then feel free to ping me. i'm interested in ions/websockets as well 🙂

joshkh17:02:52

i'm having some trouble working with cast locally. can anyone see what i'm doing wrong here? https://docs.datomic.com/cloud/ions/ions-monitoring.html#local-workflow

(require '[datomic.ion.cast])
=>
(cast/initialize-redirect :stdout)
=> :stdout
(cast/event {:msg "test"})
Execution error (IllegalArgumentException) at datomic.ion.cast.impl/fn$G (impl.clj:14).
No implementation of method: :-event of protocol: #'datomic.ion.cast.impl/Cast found for class: nil

com.datomic/ion and com.datomic/ion-dev are definitely in my tree clj -Stree

Joe Lane19:02:20

Bounce your repl, then starting afresh, first initialize, then cast. Right now if you cast before initializing it throws that error and will keep returning it until a repl restart.

2021-02-10

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