mongodb - Grouping elements having same groupid after filtering -


we have documents "metadata" element having following structure:

...  "metadata": [   { "metaname": "first_name", "value": "john",  "group": "id_1" },   { "metaname": "last_name",  "value": "doe",   "group": "id_1" },   { "metaname": "age",        "value": "55",    "group": "id_1" },   { "metaname": "first_name", "value": "hugo",  "group": "id_2" },   { "metaname": "last_name",  "value": "cabret","group": "id_2" },   { "metaname": "town",       "value": "paris", "group": "id_2" },   { "metaname": "first_name", "value": "john",  "group": "id_3" },   { "metaname": "last_name",  "value": "ford",  "group": "id_3" },   { "metaname": "age",        "value": "78",    "group": "id_3" } ] ...

we want make search involving both "metaname" , "value", have positive hit if group same. can have unlimited "metaname" in each group, e.g. "metaname": "town" or "metaname":"age" etc etc can (optionally) have multiple metadata.

note "id_x" string made initial part (id) unique each document, appended ascending ordinal (1,2,3...). e.g. document can have "group": "77de-66ea-190c-bbh5_1", "77de-66ea-190c-bbh5_2", "77de-66ea-190c-bbh5_3" etc. , 2 different documents can't have same id. don't know id_x a priori.

our difficulty find query in "and" efficiently reports hits if results in same group.

e.g. want find docs having "metaname":"first_name" , "value":"john" , "metaname":"last_name" , "value":"cabret", "group" of multiple element found must same. in case, don't have hit (since "group" id_1 "john" , id_2 "cabret".

first of all: possible make query this? have million of documents, , query made via spring data (!) trying find best way implement it. unable find query that, suggestion welcome, documentation, hints, remapping / rebuilding / refactoring of data, etc.

thank in advance.


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