A sample session working with the map from within erlang console And from curl and riak

console session with map

(riak@127.0.0.1)1> M = riak_dt_multi:new().
{{[],[]},[]}

(riak@127.0.0.1)2> riak_dt_multi:value(M).
[]

(riak@127.0.0.1)3> M1 = riak_dt_multi:update({update, [{add, {gold, riak_dt_pncounter}},
                                                       {add, {stone, riak_dt_pncounter}}]}, actor1, M).
{{[{actor1,1}],
  [{{gold,riak_dt_pncounter},{1,[{1,1}]}},
   {{stone,riak_dt_pncounter},{1,[{1,1}]}}]},
 [{{gold,riak_dt_pncounter},{[],[]}},
  {{stone,riak_dt_pncounter},{[],[]}}]}


(riak@127.0.0.1)4> riak_dt_multi:value(M1).                                                                                              
[{{stone,riak_dt_pncounter},0},{{gold,riak_dt_pncounter},0}]

(riak@127.0.0.1)5> M2 = riak_dt_multi:update({update, [{update, {gold, riak_dt_pncounter}, {increment, 100}},
                                                       {update, {stone, riak_dt_pncounter}, {increment, 50}}]}, actor1, M1).
{{[{actor1,1}],
  [{{gold,riak_dt_pncounter},{1,[{1,2}]}},
   {{stone,riak_dt_pncounter},{1,[{1,2}]}}]},
 [{{gold,riak_dt_pncounter},{[{actor1,100}],[]}},
  {{stone,riak_dt_pncounter},{[{actor1,50}],[]}}]}
(riak@127.0.0.1)6> riak_dt_multi:value(M1).                                                                                                                                        
[{{stone,riak_dt_pncounter},0},{{gold,riak_dt_pncounter},0}]

(riak@127.0.0.1)7> riak_dt_multi:value(M2).
[{{stone,riak_dt_pncounter},50},
 {{gold,riak_dt_pncounter},100}]

(riak@127.0.0.1)8> M3 = riak_dt_multi:update({update, [{update, {weapons, riak_dt_vvorset}, {add, "Halberd"}},
                                             {update, {friends, riak_dt_vvorset}, {add, dave}}]}, actor1, M2).      
{{[{actor1,1}],
  [{{friends,riak_dt_vvorset},{1,[{1,1}]}},
   {{gold,riak_dt_pncounter},{1,[{1,2}]}},
   {{stone,riak_dt_pncounter},{1,[{1,2}]}},
   {{weapons,riak_dt_vvorset},{1,[{1,1}]}}]},
 [{{friends,riak_dt_vvorset},
   {[{actor1,1}],[{dave,{1,[{1,1}]}}]}},
  {{gold,riak_dt_pncounter},{[{actor1,100}],[]}},
  {{stone,riak_dt_pncounter},{[{actor1,50}],[]}},
  {{weapons,riak_dt_vvorset},
   {[{actor1,1}],[{"Halberd",{1,[{1,1}]}}]}}]}

(riak@127.0.0.1)9> riak_dt_multi:value(M3).                                                                                                                                     
[{{weapons,riak_dt_vvorset},["Halberd"]},
 {{stone,riak_dt_pncounter},50},
 {{gold,riak_dt_pncounter},100},
 {{friends,riak_dt_vvorset},[dave]}]

(riak@127.0.0.1)12> M4 = riak_dt_multi:update({update, [{update, {profile, riak_dt_multi}, {update,
                                                           [{update, {charisma, riak_dt_pncounter}, {increment, 1000}},
                                                               {update, {magic, riak_dt_pncounter}, {increment, 999}},
                                                               {update, {strength, riak_dt_pncounter}, {increment, 90}}]}}]}, actor1, M3).
{{[{actor1,1}],
  [{{friends,riak_dt_vvorset},{1,[{1,1}]}},
   {{gold,riak_dt_pncounter},{1,[{1,2}]}},
   {{profile,riak_dt_multi},{1,[{1,1}]}},
   {{stone,riak_dt_pncounter},{1,[{1,2}]}},
   {{weapons,riak_dt_vvorset},{1,[{1,1}]}}]},
 [{{friends,riak_dt_vvorset},
   {[{actor1,1}],[{dave,{1,[{1,1}]}}]}},
  {{gold,riak_dt_pncounter},{[{actor1,100}],[]}},
  {{profile,riak_dt_multi},
   {{[{actor1,1}],
     [{{charisma,riak_dt_pncounter},{1,[{1,1}]}},
      {{magic,riak_dt_pncounter},{1,[{1,1}]}},
      {{strength,riak_dt_pncounter},{1,[{1,1}]}}]},
    [{{charisma,riak_dt_pncounter},{[{actor1,1000}],[]}},
     {{magic,riak_dt_pncounter},{[{actor1,999}],[]}},
     {{strength,riak_dt_pncounter},{[{actor1,90}],[]}}]}},
  {{stone,riak_dt_pncounter},{[{actor1,50}],[]}},
  {{weapons,riak_dt_vvorset},
   {[{actor1,1}],[{"Halberd",{1,[{1,1}]}}]}}]}

(riak@127.0.0.1)13> riak_dt_multi:value(M4).                                                                                                                                                              [{{weapons,riak_dt_vvorset},["Halberd"]},                                                 
 {{stone,riak_dt_pncounter},50},
 {{profile,riak_dt_multi},
  [{{strength,riak_dt_pncounter},90},
   {{magic,riak_dt_pncounter},999},
   {{charisma,riak_dt_pncounter},1000}]},
 {{gold,riak_dt_pncounter},100},
 {{friends,riak_dt_vvorset},[dave]}]

curl session

curl localhost:8098/buckets/foo/maps/bar
{}


curl -X POST localhost:8098/buckets/foo/maps/bar -d"{update, [{update, {chums, riak_dt_vvorset}, {add, sheila}}]}."

curl localhost:8098/buckets/foo/maps/bar
{"chums_sets":["sheila"]}

curl -X POST localhost:8098/buckets/foo/maps/bar -d"{update, [{update, {chums, riak_dt_vvorset}, {add, dave}}]}."
curl localhost:8098/buckets/foo/maps/bar
{"chums_sets":["dave","sheila"]}

curl -X POST localhost:8098/buckets/foo/maps/bar -d"{update, [{update, {chums, riak_dt_vvorset}, {add, phil}},
                                                      {update, {chums, riak_dt_vvorset}, {remove, dave}}]}."

curl localhost:8098/buckets/foo/maps/bar
{"chums_sets":["phil","sheila"]}

curl -X POST localhost:8098/buckets/foo/maps/bar -d"{update, [{update, {klout, riak_dt_pncounter}, {increment, 10000}}, {update, {submap, riak_dt_multi}, {update, [{update, {
submap_cntr, riak_dt_pncounter}, {increment, 99}}]}}]}."

curl localhost:8098/buckets/foo/maps/bar | jsonpp
 
{
  "chums_sets": [
    "phil",
    "sheila"
  ],
  "klout_counters": 10000,
  "submap_maps": {
    "submap_cntr_counters": 99
  }
}
13:20:23:riak(master *) $