我正在使用ObjCMongoDB作为访问mongoDB的可可包装器。我遇到了一个难题,那就是我必须找到并用新文档替换文档。任何人都可以通过指出要使用的ObjCMongoDB的代码/ API来帮助我。如何更新文档,将其替换为mongoDB集合中的新文档
例如:
{
"_id" : { "$oid" : "51de4ed737965b2d233f4862"} ,
"milestone" : "Application 7.1 release" ,
"pendingtasklist" : [ task1 , task2 , task3]
}
这里我不得不取代 pendingtasklist新名单,结果应该是
{
"_id" : { "$oid" : "51de4ed737965b2d233f4862"} ,
"milestone" : "Application 7.1 release" ,
"someotherlist" : [ task12 , task33 , task32]
}
我重视我使用来实现这个代码,但没有成功
NSError *connectionError = nil;
MongoConnection *dbConn = [MongoConnection connectionForServer:@"127.0.0.1:27017" error:&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:&connectionError];
在我收藏之前n将有这样的文档:
{ "_id" : { "$oid" : "51de4ed737965b2d233f4862"} , "milestone" : "Application 7.1 Release" , "problemlist" : [ 12345 , 112244 , 55543]}
{ "_id" : { "$oid" : "51de4ed737965b2d233f4864"} , "milestone" : "Application 7.1 UAT" , "problemlist" : [ 33545 , 7654 , 8767]}
上面的代码完美地工作,创建谓词时字符串中有额外的空间。 –