Added a new :db/op — :create, which ensures that no entity with the same :xt/id existed before. Mostly useful with :db/lookup, to ensure that when creating an entity with unique constraints, you don't accidentally overwrite an entity you might have created before if you don't want that.
Like :put, but will succeed only if no entity with this :xt/id existed before. Like :update, but will fail in reverse, when old version does exist (and without "applying special vals").
jacobobryant
commented
2 years ago
Added a new :db/op —
:create, which ensures that no entity with the same :xt/id existed before. Mostly useful with :db/lookup, to ensure that when creating an entity with unique constraints, you don't accidentally overwrite an entity you might have created before if you don't want that.Like
:put, but will succeed only if no entity with this :xt/id existed before. Like:update, but will fail in reverse, when old version does exist (and without "applying special vals").