java - list_append causing duplicates in Map. if list_append called for for existing keys in DynamoDB -


in following code in java trying append item "test.com" map field named "daily". when run code adds dulplicate key map.

map<string,string> atrval = new hashmap<string,string>();                 atrval.put("test.com", json);                 updateitemspec updateitemspec = new updateitemspec()                         .withprimarykey("id", id)                         .withupdateexpression("set daily = list_append(daily , :r)")                         .withconditionexpression("attribute_not_exists (daily.#k1)")                         .withvaluemap(new valuemap()                                 .withlist(":r", arrays.aslist(atrval))                                  )                         .withnamemap(new namemap()                                 .with("#k1", "test.com"));                 table.updateitem(updateitemspec);

attribute_not_exists should preventing doing that. ideas why not working.

as have map inside list, api expects index of list (something below). in java terms, data type of daily list<map<string, string>>.

when "daily.stringvalue" (i.e. daily."test.com"), can't find string value there object (i.e. map) present inside list rather string value.

"attribute_not_exists (daily[0].#k1)"

when index given, searches key inside first element.

if list have been list<string>, there option use contains. however, can't used due complexity of model.

contains supported lists: when evaluating "a contains b", "a" can list; however, "b" cannot set, map, or list.


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