How best can I query Datomic for a n-degrees subgraph? - datomic

Question

The Datomic documentation shows how to choose some attributes recursively:
[:person/firstName :person/lastName {:person/friends 6}]
But I want to pull all the attributes (I don't know them at query time).
[* {:person/friends 6}] does not recur... Is there a wildcard that excludes the relation I want to recur on? Is there a way to do recursive specification on a pull AND use wildcard?
Or is there a better way to construct this query?

Answer 1

Timothy,
You should be able to use ["*" {:person/friends 6}] for the behavior you're looking for.
Using the example from the Day of Datomic pull_recursion.clj:
(d/pull (d/db conn) '[:person/name {:person/friend 2}] anne-id)
;; {:person/name "anne", :person/friend [{:person/name "bob", :person/friend [{:person/name "anne"} {:person/name "lucille"}]} {:person/name "james", :person/friend [{:person/name "anne"} {:person/name "lucille"}]}]}
(d/pull (d/db conn) '["*" {:person/friend 2}] anne-id)
;; {":db/id" 17592186045418, ":person/name" "anne", ":person/friend" [{":db/id" 17592186045419} {":db/id" 17592186045420}], :person/friend [{":db/id" 17592186045419, ":person/name" "bob", ":person/friend" [{":db/id" 17592186045418} {":db/id" 17592186045421}], :person/friend [{":db/id" 17592186045418, ":person/name" "anne", ":person/friend" [{":db/id" 17592186045419} {":db/id" 17592186045420}], :person/friend [{":db/id" 17592186045419} {":db/id" 17592186045420}]} {":db/id" 17592186045421, ":person/name" "lucille", ":person/friend" [{":db/id" 17592186045419}], :person/friend [{":db/id" 17592186045419}]}]} {":db/id" 17592186045420, ":person/name" "james", ":person/friend" [{":db/id" 17592186045418} {":db/id" 17592186045421}], :person/friend [{":db/id" 17592186045418, ":person/name" "anne", ":person/friend" [{":db/id" 17592186045419} {":db/id" 17592186045420}], :person/friend [{":db/id" 17592186045419} {":db/id" 17592186045420}]} {":db/id" 17592186045421, ":person/name" "lucille", ":person/friend" [{":db/id" 17592186045419}], :person/friend [{":db/id" 17592186045419}]}]}]}
Marshall