moin moin

Morning

Morning folk

morning

Morning

@thomas Where are you from?

I used to have a workmate who used 'moin moin', and he was from Luxembourg 🙂

morning, btw

I am Dutch

And moin moin as I know come from east-Frisia (which is the very north western part of Germany that borders the Netherlands)

@carr0t ^^^

and the only reason I come here to the UK channel is that I have lived in the uk for almost 17 years... but I left just over a year ago and have come back to NL

Fair enough 🙂

Good morning humans and other designations

Jason is in the human group, Jade is in the other designations group

¯\(ツ)/¯

My phd supervisor was known for “moin moin” too. Baden-Württemberg area of Germany (south west)

But other Germans I knew considered it to be very twee

@yogidevbear Well I suppose that’s a positive start then.

To be fair my old workmate might have got it from Germany, as Luxembourg is next to Germany and he spoke all the languages

Morning 🙂

Has anyone got a good example of using db.type/ref in Datomic..? I am (still) trying to wrap my head around how I might use Datomic to build my / our foundation database and I realise that I don’t really__ understand how to use references properly.

(in other words, how do I define in a schema a relationship, an “edge”, between two or more datoms?)

(or am I simply not thinking about it in the “right” terms?)

I got moin moin from the python wiki that I used to use 17 years ago

@otfrom - I knew there was a Python connection to moin moin… I think I used it way back too…

hwe used moinmoin - and had a german guy working for us who was quite enthusiastic about wishing everyone moinmoin and then giggling

perhaps because of the apparent tweeness

I think giggling makes an appropriate accompaniment.

@maleghast With db.type/ref the value is just the entity ID of the datom you’re referencing. Like a foreign key.

@chrisjd - Ah ok, that makes sense - thanks 🙂

I had a look at the source code for the Datomic example DB for Musicbrainz and that was really the only bit I hadn’t wrapped my head around, so I appreciate it.

Is there any way to store values on “edges” in Datomic, I mean I can already see how datoms are like nodes / vertices, but I haven’t really been able to figure out whether or not a datom can be modelled as an edge instead of a node…

You could model the edges as datoms explicitly - so rather than nodes referencing each other, they reference edges. Then store your extra attributes on the edge datoms. So each node could have a :node/connections attribute of type db.type/ref with db.cardinality/many that reference connected edge datoms.

With Foreign Keys in an RDBMS one can create utility look-ups so that one can find the right ID to add into a related record as the database grows large and there are many items that need to be added into new data in this way… Is there a Datomic way of doing this..? As in an idiomatic / received way of doing it, as well as or instead of a “feature” designed to make it easier / simpler..?

Alternatively, you invert the relationship so an edge datom has :edge/from and :edge/to, both refs.

@chrisjd - re edges, I see what you mean; that makes sense, thanks 🙂

Frankly the ability to model it in a couple of different ways is quite awesome / felxible.

I think that what I am going to do in the first instance is create some pretty open / simple schema for very general “classes” of data, such as person, organisation, country etc. and then create schema for specialised versions of these core types over time as / when it becomes necessary to create highly specified datoms.

That makes sense. The philosophy is very much about “accretion”, so starting general and adding more attributes as you need them works well. 🙂

🙂

Brilliant… It’s still a ridiculous mountain to climb, but at least I feel as though I have a plan that is the product of some serious consideration and thought.

Are people broadly in favour of Conformity ( https://github.com/rkneufeld/conformity ) or “something else”(tm) or neither?

Also, I have a feeling someone said to me that there is a clojure.spec -> Datomic Schema workflow / path / approach that if I am remembering it correctly I would probably enjoy… Finally I find myself wondering if anyone has cracked connecting up forms in a ClojureScript app with inserting data into Datomic..?

we use conformity

@dominicm - That’s a more than good enough vote of confidence for me…

🙂