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POHow to Update a document by replacing it with a new document in a collection of mongoDB
 

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  1. POHow to Update a document by replacing it with a new document in a collection of mongoDB
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    <p>I am using ObjCMongoDB as a cocoa wrapper for accessing mongoDB. I am facing difficulty in a scenario where I have to find and replace a document with a new document. Can any one help me by pointing out the code/API of ObjCMongoDB to use.</p> <p>For example:</p> <pre><code>{ "_id" : { "$oid" : "51de4ed737965b2d233f4862"} , "milestone" : "Application 7.1 release" , "pendingtasklist" : [ task1 , task2 , task3] } </code></pre> <p>here I have to <strong>replace</strong> pendingtasklist with new list and result should be </p> <pre><code>{ "_id" : { "$oid" : "51de4ed737965b2d233f4862"} , "milestone" : "Application 7.1 release" , "someotherlist" : [ task12 , task33 , task32] } </code></pre> <p>I have attached the code I am using to achieve this, but without success </p> <pre><code>NSError *connectionError = nil; MongoConnection *dbConn = [MongoConnection connectionForServer:@"127.0.0.1:27017" error:&amp;connectionError]; MongoDBCollection *collection = [dbConn collectionWithName:@"mydb.milestones"]; MongoKeyedPredicate *predicate = [MongoKeyedPredicate predicate]; [predicate keyPath:@"milestone" matches:@"Application 7.1 release"]; MongoUpdateRequest *updateReq = [MongoUpdateRequest updateRequestWithPredicate:predicate firstMatchOnly:YES]; NSDictionary *milestoneDict = @{@"problemlist": @[@"12345",@"112244",@"55543",@"009009"],@"milestone":@"Application 7.1 release"}; [updateReq replaceDocumentWithDictionary:milestoneDict]; BOOL result = [collection updateWithRequest:updateReq error:&amp;connectionError]; </code></pre> <p>Before my collection will have documents like this:</p> <pre><code>{ "_id" : { "$oid" : "51de4ed737965b2d233f4862"} , "milestone" : "Application 7.1 Release" , "problemlist" : [ 12345 , 112244 , 55543]} { "_id" : { "$oid" : "51de4ed737965b2d233f4864"} , "milestone" : "Application 7.1 UAT" , "problemlist" : [ 33545 , 7654 , 8767]} </code></pre>
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    1. USKiran Balegar
    1. USKiran Balegar
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    1. COThe above code works perfectly, there was a extra space in the string while creating the predicate.
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      1. POHow to Update a document by replacing it with a new document in a collection of mongoDB
      1. USKiran Balegar
 

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