@mgrbyte thanks for the suggestion

i'm trying to run the day-of-datomic tutorials. I'm following the README to lein run -m datomic.samples.tutorials which is blowing up with a connection refused error. Has anyone run across this before?

@dpsutton can you link me the code?

(it’s on a git repo I assume?)

https://github.com/Datomic/day-of-datomic

yeah it's stu halloway's day of datomic. and just cranking it up is not working for me

there seem to be some in-memory examples which work fine, but some examples seem to be reaching out to a running instance which hasn't been started as far as i can tell

@dpsutton yeah, looks like partition_locality is hitting a non-mem conn https://github.com/Datomic/day-of-datomic/blob/59186b4b39c124e2d9d0e79243f3e373b0a0b9d9/tutorial/partition_locality.clj#L27

yeah. i don't understand how this is supposed to work, honestly

the readme seems pretty silent about it

if it’s only a couple of tutorial steps I guess you can just skip them for now. Then later you have two options:

either set up a local datomic free transactor. As far as I can see there are steps in the README of the mbrainz repo to do it

https://github.com/Datomic/mbrainz-sample

or adapt the tutorial to use an in-memory database (probably harder if you are not familiar with datomic)

actually I get why they’re using a non-memory db…

As far as I know you can’t restore a DB from a backup if you are using an in-memory DB

and the mbrainz-sample data is provided as a db backup

(which you can then restore to populate your database)

Follow the README from mbrainz-sample, it should guide you through the necessary steps

@dpsutton ^

I’m starting out a new project and the only thing I know for sure is that I’m going to use Datomic, but I haven’t really decided on a front-end yet. What are my best options these days?

@hkjels are you looking to use clojurescript or not?

ClojureScript for sure

@hmaurer thanks a lot. i'll get on that in a second

In that case I can’t advise you much as I am new to Clojure. It depends how experimental you want to go. From what I gather something like Om next is a safe bet. There are also people attempting to do things with Datascript

I watched this talk recently: https://www.youtube.com/watch?v=aI0zVzzoK_E

http://precursorapp.com also works by syncing Datascript and Datomic

and is open-source (https://github.com/PrecursorApp/precursor)

It seems non-trivial if your project has non-trivial requirements though (lots of data, authorization concerns, etc)

e.g. in the talk linked above the speaker worked on a project where every user had full access and the data-set was fairly small, so he could afford to replicate it “dumbly” to every user’s browser over websocket

I see

You might also want to watch this talk: https://www.youtube.com/watch?v=qijWBPYkRAQ

(they use Om Next)

You might get more useful advice on frontend options if you ask on #clojurescript 🙂

This was plenty 😀 I’ll have a look at these videos

As a last bit of info: I am working on a project right now with Datomic on the backend. I have 0 experience with Clojurescript and I am new to Datomic so I didn’t want to go full experimental with Datascript/Om Next. I ended up writing some code to auto-generate a GraphQL schema from my Datomic schema + an extra map of information to handle the basic CRUD stuff.

Then I added some custom behaviour on top of that

I am using Javascript (ES6) + Relay on the frontend, hitting a GraphQL API mostly auto-generated

(my needs are very simple though; basic CRUD)

I haven’t decided if I’m going with safe just yet. If so, that sounds like a really good option, to generate GraphQL I mean

and safe for me would be re-frame

@hkjels the first talk I linked mentions re-frame. They are using https://github.com/mpdairy/posh, which is a library on top of re-frame and Datascript (from what I gather)

This was great! I have the rest of my evening set 😉

Enjoy 🙂