MongoDB PHP insert into sub-array -


ok, not sure if mongodb can this, need following json inserted currency db.

the part want update exchangehistory, need keep history of exchange rates day. , next day e.g.

for e.g

{"from":"usd","currentexchange":[{"to":"nzd","rate":"1.3194","updated":"6\/5\/20121:38am"},{"to":"kwd","rate":"0.2807","updated":"6\/5\/20121:38am"},{"to":"gbp","rate":"0.6495","updated":"6\/5\/20121:38am"},{"to":"aud","rate":"1.0228","updated":"6\/5\/20121:38am"}],"exchangehistory":{"6\/5\/2012":[{"1:38am":[{"to":"nzd","rate":"1.3194","updated":"1:38am"}]},{"1:38am":[{"to":"kwd","rate":"0.2807","updated":"1:38am"}]},{"1:38am":[{"to":"gbp","rate":"0.6495","updated":"1:38am"}]},{"1:38am":[{"to":"aud","rate":"1.0228","updated":"1:38am"}]}]}}

i not store in array this. create flat data structure has:

{     from: "usd",     to: "eur",     updated: new datetime("2012-05-04 13:43"),     rate: 1.235, }, {     from: "usd",     to: "eur",     updated: new datetime("2012-05-06 13:43"),     rate: 1.24, }, {     from: "usd",     to: "aud",     updated: new datetime("2012-05-06 13:43"),     rate: 1.43, }

this lot lighter on database, documents never grow. , if documents grow have moved. can query current rate:

$collection->find( array( 'from' => 'usd', 'to' => 'eur' ) )            ->sort( 'updated' => -1 )->limit( 1 );

and accessing historical information:

$collection->find( array( 'from' => 'usd', 'to' => 'eur' ) )            ->sort( 'updated' => -1 )->skip( 1 );

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