@luchini @daveeliepmann thank you and thank you. each tag can be authored by a different person. the reason i am keeping track of this is because: other users can "verify" a tag, which awards the original tagger a point. it's important to incentivize cooperative behavior in social platforms. I have a :tag/blurb and it sounds like you both agree I should put a schema property :blurb/tags with cardinality many... good idea and I agree.

@daveliepmann *

is it possible to update a datomic attribute from unique/value to unique/identity via transacting new schema?

I just tried to do exactly that to a running datomic system, the schema attribute is listed as unique/identity now, but when I try to do an upsert, I still get a unique conflict.

I see from this table that it should be possible http://docs.datomic.com/schema.html#altering-schema-attributes. I'll keep investigating why I'm not seeing the behavior I expect

hmm, what's the easiest way to get datomic to unify with a constant value, for example in an or clause to handle a missing value.

e.g (or [?thing :foo/bar ?value] [(str "(null)") ?value]) I guess?

Oh, there's a bunch of new stuff, like ground.

does anyone know if its possible to add new schema to a running db?

@gcast absolutely

you can assert new schema at any time

do you per chance know where I may read about that? for some reason its not working for me.

http://docs.datomic.com/schema.html

what specifically isnt working?

well I transact and it appears to succeed but then I run this query,

[:find ?attr ?type ?card
               :in $
               :where
               [_ :db.install/attribute ?a]
               [?a :db/valueType ?t]
               [?a :db/cardinality ?c]
               [?a :db/ident ?attr]
               [?t :db/ident ?type]
               [?c :db/ident ?card]]

and the new attributes are not there

http://docs.datomic.com/tutorial.html#schema

did you get a new value of the db after you transacted the schema?

yes

might want to look at these schema queries: https://github.com/Datomic/day-of-datomic/blob/master/tutorial/schema_queries.clj

hmm well I just noticed that I do not do a blocking take when I transact

I put the transact call in a do

you’ll want to look at the returned value

to make sure it was successful

ok. thank you

-_- forgot to request latest db before querying to confirm schema txs

😉

that’ll do it