@tonsky @metasoarous @alexandergunnarson I added a pr for tx-middleware tonsky/datascript#234 which would help address some of these schema issues, but i think would allow some flexibility for solving some other open problems in datascript that have performance trade offs. If you think this is a good direction @tonsky there is still some more polish to be done here.
i know there were talks about it, but i don't know what come of those...
Hi @tonsky. Would you mind having a look at the PR @bamarco linked to above? It would be helpful for us to have a litmus as to whether this middleware idea is something you'd consider or not. We'd love to see it in datascript if you and others see value in it, and don't mind biding time for it to be fully vetted. But if you're disinclined, we'd like to get the ball rolling on figuring out how we work this into datsync/datsys.
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Wow! It's late 2021 and someone (moi) is busy hacking around with datascript. Playing with the datascript tutorial found at https://github.com/kristianmandrup/datascript-tutorial/blob/master/datascript_getting_started.md for the clojure demo, using the latest datascript. The system creates a connection, then properly populates the database, but the query returns nothing. That's confusing; the API call to d/q seems correct; there is a populated connection, but no response. What might I be missing? Thanks in advance.
Hie do you know the conn has data in it?
How*
Did you print it out in some way?
(prn @conn)
By the way a keyword like :name can’t go in the first position in a datascript datom
?e is the entity id. ?attr is the keyword attribute
Wow! That was complex; I looked up datascript pull: https://cljdoc.org/d/datascript/datascript/1.2.8/api/datascript.core#pull and settled on this:
(d/pull @conn '[:db/id, :name] 1) which is working from data that looks like this:
:datoms [[1 :age 30 536870913] [1 :name Bob 536870913] [2 :age 15 536870913] [2 :name Sally 536870913]]}}]
and still get nothing. Even using 536870913 instead of 1 returned nothing. I'll make a gist of this code and link to it.
(d/pull @conn '[:db/id, :name] 1) which is working from data that looks like this:
:datoms [[1 :age 30 536870913] [1 :name Bob 536870913] [2 :age 15 536870913] [2 :name Sally 536870913]]}}]
and still get nothing. Even using 536870913 instead of 1 returned nothing. I'll make a gist of this code and link to it.
A gist of this code is here
https://gist.github.com/KnowledgeGarden/780b2d485a2211ccf6e4c643bc187ac8
https://gist.github.com/KnowledgeGarden/780b2d485a2211ccf6e4c643bc187ac8
From another experiment that's not going well, I get this message, which does not give decent google:
"WARNING: requiring-resolve already refers to: #'clojure.core/requiring-resolve in namespace: datomic.common, being replaced by: #'datomic.common/requiring-resolve"
I have no clue where to start; this is an experiment in a simple memory db test using datomic-free
"WARNING: requiring-resolve already refers to: #'clojure.core/requiring-resolve in namespace: datomic.common, being replaced by: #'datomic.common/requiring-resolve"
I have no clue where to start; this is an experiment in a simple memory db test using datomic-free
Here is a possible hint: I hand entered the require, and some definitions into repl. Then, when I run d/entity and d/pull, they run fine.
datascript-test.core=> (d/pull @conn '[:db/id, :name] 99)
{:db/id 99, :name "Bob"}
Why repl, but not in a main function? The function itself appears to run because it executes some printlns.
datascript-test.core=> (d/pull @conn '[:db/id, :name] 99)
{:db/id 99, :name "Bob"}
Why repl, but not in a main function? The function itself appears to run because it executes some printlns.
datascript doesn't use datomic as a dependency
try removing datomic from your project.clj if you are using lein, or from your deps.edn if you are using the clojure command line tools
it may be that the repl doesn't load datomic and causes no problems. this behavior is very strange
maybe make a project that just has the datascript bits and nothing else
main is intricately tied to the java runtime so that may also be where the issue lies in a difference between the repl and main. as a wild idea you could try putting genclass in your namespace to get the
main function to work properly if you haven't done that (I rarely use main)
my actual version of clojure is
Clojure CLI version 1.10.3.855
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (IcedTea 3.7.0)
line 36 in your jist has a really high number which looks like a datascript timestamp and not an eid
gist*
BTW @KnowledgeGarden; You may get more active responses over at the Clojurians Slack chat, in the #datascript channel.