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POHowto MongoDB update / $set entire subdocument
 

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  1. POHowto MongoDB update / $set entire subdocument
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    <p>In my MongoDB, I have Document1, as seen below. I want to reach into the "main.accounts" (and later, "main.entries") document, and update ($set) an entire sub-document in a "content' array. Wrt sub-documents, so far, I've been able to add and remove a document to and from a "content" sub-array. But in this case, I want to update the entire document; Not just update ($set) one property in a matched document. </p> <p>Below, I've tried using just a $set, a $set with $elemMatch. And I've also tried findAndModify, but to no avail. Of course, I've i) RTFM, looked all around ii) the internet and iii) SO, to find a solution. Has anyone been able to update an entire document in this manner? </p> <p>Thanks Tim </p> <p><strong>Update try 1</strong> - this is the only update that works, but sets the entire "content" array to the hash … { "fu" : "bar" }</p> <pre> db.bookkeeping.update( { owner : "twashing@gmail.com", "content.content.tag" : "account", "content.content.id" : "one" }, { $set : { "content.$.content" : { "fu" : "bar" } } } ) </pre> <p><strong>Update try 2</strong> - this doesn't fail, but doesn't update the document in question</p> <pre> db.bookkeeping.update( { owner : "fu", thing : { $elemMatch : { "content.content.tag" : "account", "content.content.id" : "one" } } }, { $set : { "thing" : { "fu" : "bar" } } } ) </pre> <p><strong>Update try 3</strong> - this doesn't fail, but doesn't update the document in question</p> <pre> db.bookkeeping.update( { thing : { $elemMatch : { owner : "fu" , "content.content.tag" : "account", "content.content.id" : "one" } } }, { $set : { "thing.content.content.$" : { "fu" : "bar" } } } ) </pre> <p><strong>Document1</strong></p> <pre> { "_id" : "fid", "content" : [ { "content" : [ { "id" : "one", "tag" : "account" }, { "id" : "two", "tag" : "account" }, { "id" : "three", "tag" : "account" }, { "id" : "four", "tag" : "account" }, { "id" : "five", "tag" : "account" } ], "id" : "main.accounts", "tag" : "accounts" }, { "tag" : "journals", "id" : "main.journals", "content" : [ { "tag" : "journal", "id" : "generalledger", "name" : "generalledger", "type" : "", "balance" : "", "content" : [ { "tag" : "entries", "id" : "main.entries", "content" : [ ] } ] } ] } ], "owner" : "fu", "tag" : "fubar" } </pre>
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    1. COwhich document do you want to update. confused by the question. why do you keep talking about update ($set)?
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    2. COI'm trying to update the object: `{ "id" : "one", "tag" : "account" }`. And I mean that functionally, I want to update said document. And I'm trying to do that using the $set operator. Hth.
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