Created
March 24, 2010 20:19
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# Problem: Given the following document in the database, I want to update | |
# Dave Gahan's second prescription for Dilaudid from a quantity of 45 to | |
# a quantity of 30. | |
{ "_id" : 1 | |
"name" : "Dave Gahan" | |
"medications" : [ | |
{ "id" : 23, | |
"name" : "Dilaudid", | |
"type" : "Rx", | |
"prescriptions" : [ | |
{ "id" : 13, | |
"quantity" : 60, | |
"started" : 2009-01-01 | |
}, | |
{ "id" : 77, | |
"quantity" : 45, | |
"started" : 2009-02-01 | |
} | |
] | |
}, | |
{ "id" : 41, | |
"name" : "Oxycodone", | |
"type" : "Rx" | |
} | |
] | |
} | |
# First try was using 1.3.4 $ positional locator... These do not find the | |
# document embedded multiple levels: | |
collection.update( | |
{ "_id" : 1, "medications._id" : 23, "medications.prescriptions._id" : 77 }, | |
{ $set : { "medications.prescriptions.$.quantity" : 30 } }, | |
false, | |
true | |
) | |
collection.update( | |
{ "_id" : 1, "medications._id" : 23, "medications.prescriptions._id" : 77 }, | |
{ $set : { "medications.$.prescriptions.$.quantity" : 30 } }, | |
false, | |
true | |
) | |
# What I would like is to be able to match on mutliples, given a syntax like the following: | |
collection.update( | |
{ "_id" : 1, "medications._id" : 23, "medications.prescriptions._id" : 77 }, | |
{ $set : { "medications.$0.prescriptions.$1.quantity" : 30 } }, | |
false, | |
true | |
) |
I don't know if there's a reason MongoDB doesn't support this, but boy would it make life so much easier...
It's 2016 and this is very much still an issue. I have created a simple workaround using the C# driver, hopefully it helps.
https://gist.github.com/dlee148/a0ec830baff5c71471213616f22cb902
any updates ?? *2017
is there any update for this?
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This solution (medications.$.prescriptions.0.quantity) was helpful, but arises next issue: to find index of array (in example is used "0"). As version of solution to find and retrieve index of necessary element in array as separate query and substitute inside "update query".
Any way, thank you for advice.