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datascript 2022-02-23
johanatan 2022-02-23T20:10:34.273659Z
hi, could someone please explain why the following predicate expression isn't filtering out the keyword mentioned:
core=> (cljs.pprint/pprint (d/q `[:find [?k ...] :where [?e :root/user ?r][?r ?k ?v][('not= ?k :user/feature-flags)]] @connection))
[:user/id
:user/disable-global-role?
:user/has-to-accept-license?
:user/first-name
:user/last-name
:user/feature-flags
:user/role
:user/company-id
:user/avatar-url
:user/app-roles
:user/email]
niljohanatan 2022-02-23T20:11:36.381549Z
I in fact get the same result if i toggle the not= to = (which violates boolean algebra). this indicates to me that the predicate isn't even running (and a println inside the predicate also confirms that [with a custom, user-defined predicate and the attending :in clause to bring it in]).
johanatan 2022-02-23T20:13:14.393619Z
this is the result with =:
core=> (cljs.pprint/pprint (d/q `[:find [?k ...] :where [?e :root/user ?r][?r ?k ?v][('= ?k :user/feature-flags)]] @connection))
[:user/id
:user/disable-global-role?
:user/has-to-accept-license?
:user/first-name
:user/last-name
:user/feature-flags
:user/role
:user/company-id
:user/avatar-url
:user/app-roles
:user/email]
nil
I think your problem may be that you're quoting the '= and 'not= symbols.
👍 1
You're already inside an outer [:find ...] quote there, so this would not produce the desired result
user=> `[:find 'not]
[:find (quote clojure.core/not)]johanatan 2022-02-23T21:45:50.993389Z
Yes but strangely datascript does not throw the unknown predicate error
johanatan 2022-02-23T21:46:33.160409Z
I actually wanted backtick so I could use # to get unique variable syms
johanatan 2022-02-23T21:46:56.024619Z
But yea btw this conversation already occurred in #datomic
johanatan 2022-02-23T21:47:08.374909Z
Thanks for reaching out though
Sure thing