On 28 April 2016 at 17:02, Sanket Agrawal <sanket.agra...@gmail.com> wrote:
> Not sure if this has been asked before - given a map, how does one go > about retrieving the key of the map? > > For example, in Riak example for map > <http://docs.basho.com/riak/kv/2.0.0/developing/data-types/#maps>, a map > is created with "ahmed_info" key. > > If we were to write a commit hook in Erlang where we want to do some kind > of action based on the key, it will be helpful to have a way to extract the > key. > > I looked in basho erlang client documentation here for map, but don't see > any function to extract the key. Perhaps we have to do pattern match to > extract the key? > http://basho.github.io/riak-erlang-client/riakc_map.html > > I also see erlang libraries under riak installation (one of them > "riak_object" is called in "commit hook" example in documentation) - I can > check there as well if there is online documentation somewhere for them. > > I am thinking of storing user info as immutable maps, something like > <username>_<info>_<timestamp>, and have an erlang commit hook that updates > <username>_<info>_<latest> map with the latest entry. For that, we need to > extract the map key. > > Hi Sanket, The actual association between an Erlang CRDT object and a bucket-type, bucket, and key has to be done separately from creating the object itself. Please have a look at the "counters" example on the same page. I agree that this could be documented better and have mentioned your question to our documentations team. Kind Regards, Magnus -- Magnus Kessler Client Services Engineer Basho Technologies Limited Registered Office - 8 Lincoln’s Inn Fields London WC2A 3BP Reg 07970431
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