cannot read property 1 of null

[jdkealy]

When I pass in a rule with a function to match a regex, I can call the function multiple times with different inputs so long as the attribute exists in all datoms. I can call the function once even when the attribute does not exist in all datoms. I get a long obscure error if I call the function multiple times when the attribute does not exist in all datoms. My test attribute here is :photo/does_not_exist.

(def test-schema {})
(def test-conn (d/create-conn schema))
(defn matcher-func [input to-match]
(re-find (re-pattern (.toLowerCase (clj->js input))) (.toLowerCase (clj->js to-match))))

(let [tx (d/transact! test-conn [{:db/id 1 :photo/thumb "foo.jpg" :photo/name "AAA" :photo/caption "BBB"}
                               {:db/id 2 :photo/thumb "bar.jpg" :photo/name "DDD" :photo/caption "AAA"}])]

;calling the function once with missing attributes
(d/q '{:find [?p]
       :in [$ % ?match-func]
       :where
       [[?p :photo/thumb _]
        (findall ?match-func ?p "a")]}
     @test-conn
     '[[(findall ?match-func ?p ?input) [?p :photo/name ?pn][(?match-func ?input ?pn)]]
       [(findall ?match-func ?p ?input) [?p :photo/caption ?pn][(?match-func ?input ?pn)]]
       [(findall ?match-func ?p ?input) [?p :photo/does_not_exist ?pn][(?match-func ?input ?pn)]]]
     matcher-func)

{[2] [1]}

  ;calling the function twice without missing attributes
  (d/q '{:find [?p]
       :in [$ % ?match-func]
       :where
       [[?p :photo/thumb _]
        (findall ?match-func ?p "a")
        (findall ?match-func ?p "b")]}
     @test-conn
     '[[(findall ?match-func ?p ?input) [?p :photo/name ?pn][(?match-func ?input ?pn)]]
       [(findall ?match-func ?p ?input) [?p :photo/caption ?pn][(?match-func ?input ?pn)]]]
     matcher-func)

#{[1]}

;calling the function twice with missing attributes
(d/q '{:find [?p]
       :in [$ % ?match-func]
       :where
       [[?p :photo/thumb _]
        (findall ?match-func ?p "a")
        (findall ?match-func ?p "b")]}
     @test-conn
     '[[(findall ?match-func ?p ?input) [?p :photo/name ?pn][(?match-func ?input ?pn)]]
       [(findall ?match-func ?p ?input) [?p :photo/caption ?pn][(?match-func ?input ?pn)]]
       [(findall ?match-func ?p ?input) [?p :photo/does_not_exist ?pn][(?match-func ?input ?pn)]]]
     matcher-func))

"Error evaluating:" (d/q (quote {:find [?p], :in [$ % ?match-func], :where [[?p :photo/thumb ](findall ?match-func ?p) (findall ?match-func ?p "b")]}) (clojure.core/deref test-conn) (quote [[(findall ?match-func ?p ?input) [?p :photo/name ?pn] [(?match-func ?input ?pn)]] [(findall ?match-func ?p ?input) [?p :photo/caption ?pn] [(?match-func ?input ?pn)]] [(findall ?match-func ?p ?input) [?p :photo/does_not_exist ?pn] [(?match-func ?input ?pn)]]]) matcher-func) :as "datascript.q.call(null,new cljs.core.PersistentArrayMap(null, 3, [new cljs.core.Keyword(null,"find","find",496279456),new cljs.core.PersistentVector(null, 1, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"?p","?p",-10896580,null)], null),new cljs.core.Keyword(null,"in","in",-1531184865),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"$","$",-1580747756,null),new cljs.core.Symbol(null,"%","%",-950237169,null),new cljs.core.Symbol(null,"?ma
tch-func","?match-func",2022652070,null)], null),new cljs.core.Keyword(null,"where","where",-2044795965),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Keyword("photo","thumb","photo/thumb",1624132066),new cljs.core.Symbol(null,"","_",-1201019570,null)], null),cljs.core.list(new cljs.core.Symbol(null,"findall","findall",1888933708,null),new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?p","?p",-10896580,null),"a"),cljs.core.list(new cljs.core.Symbol(null,"findall","findall",1888933708,null),new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?p","?p",-10896580,null),"b")], null)], null),cljs.core.deref.call(null,blakbox.api.test_conn),new cljs.core.PersistentVector(null, 3, 5, cljs.cor
e.PersistentVector.EMPTY_NODE, [new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Symbol(null,"findall","findall",1888933708,null),new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null)),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Keyword("photo","name","photo/name",1599012447),new cljs.core.Symbol(null,"?pn","?pn",704318294,null)], null),new cljs.core.PersistentVector(null, 1, 5, cljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null),new cljs.core.Symbol(null,"?pn","?pn",704318294,null))], null)], null),new cljs.core.PersistentVector(null, 3, 5, c
ljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Symbol(null,"findall","findall",1888933708,null),new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null)),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Keyword("photo","caption","photo/caption",-978411948),new cljs.core.Symbol(null,"?pn","?pn",704318294,null)], null),new cljs.core.PersistentVector(null, 1, 5, cljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null),new cljs.core.Symbol(null,"?pn","?pn",704318294,null))], null)], null),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Sy
mbol(null,"findall","findall",1888933708,null),new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null)),new cljs.core.PersistentVector(null, 3, 5, cljs.core.PersistentVector.EMPTY_NODE, [new cljs.core.Symbol(null,"?p","?p",-10896580,null),new cljs.core.Keyword("photo","does_not_exist","photo/does_not_exist",-133167301),new cljs.core.Symbol(null,"?pn","?pn",704318294,null)], null),new cljs.core.PersistentVector(null, 1, 5, cljs.core.PersistentVector.EMPTY_NODE, [cljs.core.list(new cljs.core.Symbol(null,"?match-func","?match-func",2022652070,null),new cljs.core.Symbol(null,"?input","?input",-405387186,null),new cljs.core.Symbol(null,"?pn","?pn",704318294,null))], null)], null)], null),blakbox.api.matcher_func);\n"

<TypeError: Cannot read property '1' of null>

TypeError: Cannot read property '1' of null
at context_resolve_val (http://localhost:8080/js/out/datascript/query.js:1097:127)
at http://localhost:8080/js/out/datascript/query.js:1142:45
at filter_by_pred (http://localhost:8080/js/out/datascript/query.js:1144:3)
at _resolve_clause (http://localhost:8080/js/out/datascript/query.js:1514:40)
at cljs.core.seq_reduce.seq_reduce__3 (http://localhost:8080/js/out/cljs/core.js:6463:14)
at cljs.core.seq_reduce.seq_reduce (http://localhost:8080/js/out/cljs/core.js:6484:22)
at cljs.core.LazySeq.cljs$core$IReduce$_reduce$arity$3 (http://localhost:8080/js/out/cljs/core.js:9200:29)
at cljs.core._reduce._reduce__3 (http://localhost:8080/js/out/cljs/core.js:1805:13)
at cljs.core._reduce._reduce (http://localhost:8080/js/out/cljs/core.js:1827:19)
at cljs.core.reduce.reduce__3 (http://localhost:8080/js/out/cljs/core.js:6559:26)

[tonsky]

I can reproduce that, thx, looking into right now

[tonsky]

Fixed in 0.7.2, thanks for the heads-up!

[jdkealy]

AMAZING!