Thanx - now it works!
Your explanations were very good.
I also found I had to change from bitcask to eleveldb.
I added one object with the same index and then I got the answer
{ok, [[<<"persons">>,<<"kenny">>],[<<"persons">>,<<"bosse">>]]}
Hmmm ... why is it a list in a list?
/Roland
----- Original Message -----
From: "Russell Brown" <[email protected]>
To: "Roland Karlsson" <[email protected]>
Cc: [email protected]
Sent: Wednesday, October 5, 2011 3:12:04 PM
Subject: Re: Secondary Index ??
On 5 Oct 2011, at 13:45, Roland Karlsson wrote:
> Hi,
>
> I might not look hard enough - but I cannot find how to use
> the secondary indices from the riakc erlang client interface.
> No example and no manual.
Ooops, we'll get on that.
>
> I need a simple example how to write an indexed object
> and also a simple example how to look it up via the index.
>
> This is my own try to write and lookup an object
> It does not work :)
Doesn't work crash or doesn't work, you get {ok, []} when you query the index?
>
> ----------------------------------------------------------
> write_index(Pid) ->
>
>
>
> Bucket = <<"persons">>,
> Key = <<"bosse">>,
> Index = {<<"lives">>, <<"sumatra">>},
Indexes should have a suffix of either _bin for binary or _int for integer.
> Obj = riakc_obj:new(Bucket, Key, <<"1949">>),
> Meta = dict:store(?MD_INDEX, Index, dict:new()),
Index should be a list. If it *was* in a list you would have got an error
{error,<<"{precommit_fail,[{unknown_field_type,<<\"lives\">>}]}">>} on put.
> Obj2 = riakc_obj:update_metadata(Obj, Meta),
> riakc_pb_socket:put(Pid, Obj2).
> ----------------------------------------------------------
> read_index(Pid) ->
> Bucket = <<"persons">>,
> Index = <<"lives">>,
Again, the suffix. or you'll get
{error,<<"{inputs,[{unknown_field_type,<<\"lives\">>}]}">>} when you do that
get_index.
> IndexKey = <<"sumatra">>,
> riakc_pb_socket:get_index(Pid, Bucket, Index, IndexKey).
>
>
> ----------------------------------------------------------
Do _all_ that and I get {ok,[[<<"persons">>,<<"bosse">>]]} as the output from
get_index.
We'll get those docs updated.
Cheers
Russell
>
>
> /Roland
>
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