I’m struggling with making a query that would show me all entities in the database. I tried this:
(d/q '[:find ?e ?a ?v
:in $
:where [?e ?a ?v]]
db)
But I get an error: Insufficient binding of db clause: [?e ?a ?v] would cause full scan
What if full scan is what I need? How do I do it?
A query is used to get back much more limited sets of data, using the indexes, plus cache, plus the predicates in the query to unify all the variables to a resulting set. The way your query is written, has no predicates, and unification results in every latest datom (presuming you’re not using a history DB) … So it’s not really querying anything.
I looks like you just want access to the :eavt index directly - you can get pretty much exactly what you’re trying to do (and a bit more) with the datoms fn: datomic.client.api documentation
OR - if you want to just iterate on distinct entities, while simultaneously pulling all of their attributes/values (as a seq of entity maps) - then you can use the very handy index-pull fn using the :avet index - this however requires that you provide at least the name of an attribute that the entities must have, but usually that’s more useful anyway. You can do this with a query as well, but index-pull walks the sorted index in the order of the values (if that is advantageous to you)
Thanks, it’s starting to make sense 