my gamefamilies collection looks like this
{
"_id": ObjectId('54cc3ee7894ae60c1c9d6c74'),
"game_ref_id": "REF123",
..
"yearwise_details": [
{
"year": 1,
...
"other_details": [
{
"type": "cash",
"openingstock": 988
..
},
{
"type": "FLU",
"openingstock": 555
..
},
..other items
]
},
{
"year": 2,
...
"other_details": [
{
"type": "cash",
"openingstock": 3000,
....
},
...
{
"type": "ghee",
"openingstock": 3000,
...
},
..
]
}
]
}
My update query
db.gamefamilies.update({"game_ref_id": "REF123", "teamname": "manisha","yearwise_details.year": 2, "yearwise_details.other_details.type": "ghee"}, {"$set": {"yearwise_details.0.other_details.$.openingstock": 555} });
Document is getting picked up correctly. I expect to update year 2's item type="ghee" but instead year 1's 2nd item (type FLU) gets updated. What am I doing wrong ?
Any help would be greatly appreciated.
regards
Manisha
Unfortunately, there is not yet support for nested $ positional operator updates.
So you can hardcode the update with
db.gamefamilies.update({"game_ref_id": "REF123",
"teamname": "manisha",
"yearwise_details.year": 2,
"yearwise_details.other_details.type": "ghee"},
{"$set":
{"yearwise_details.1.other_details.$.openingstock": 555}});
But notice that the yearwise_details.1.other_details is hardcoding that you want the second value of the array (it is 0-indexed, so the 1 is referencing the second element). I am assuming you found the command you have in your question because it worked for the first element of the array. But it will only ever work on the first element and the command above will only ever work on the second element.
Related
I have code that uses existing collection that I want to update name field value which is present in taskMap key how i run with run liqubase changeset for that .
sample code :
"changes": [
{
"collectionName": "bulk_import_job_spec"
},
{
"findOneAndUpdate": {
{"_id": 101},
[{"$set": {"task_map": {"import": {"_id": 1, "name": "Category Association"}}}}]
},
{
"returnNewDocument": true
}
]
your questions is quite vague. Please provide some more details so that we can understand your issue.
I have another problem to solve here. Thinking in arrays sometimes could be very challenging. Here is what I am lined up with. This is what my data looks like: -
{
"_id": { "Firm": "ABC", "year": 2014 },
"Headings": [
{
"costHead": "MNF",
"amount": 500000
},
{
"costHead": "SLS",
"amount": 25000
},
{
"costHead": "OVRHD",
"amount": 100
}
]
}
{
"_id": { "Firm": "CDF", "year": 2015 },
"Headings": [
{
"costHead": "MNF",
"amount": 15000
},
{
"costHead": "SLS",
"amount": 100500
},
{
"costHead": "MNTNC",
"amount": 7500
}
]
}
As you can see, I have a list that has a whole bunch of sub-documents.
Here is what I want to do .. I need to add more elements to this "Headings" list which should be : -
{
"costHead": "FxdCost",
"amount": "$Headings.amount (for costhead MFC) + $Headings.amount (for costhead OVRHD)"
}
I am unsure as to how to produce the above. Here are some challenges: -
I can addToSet the new subdocument I wish to add but the problem is addToSet can only be used in the group stage - which would be expensive (unless of course there is no other way).
Even if I use addToSet, I always have to use the $ operator to refer to elements that I read from my JSON file. Now the element I am trying to add here (costHead: FxdCost) is not present in my JSON file and hence I cannot use the $ operator.
Does anyone have any advice on how to go about this. This is after all basic ETL.
H,
I'm trying to update the version field in this object but I'm not able to make a query with 2 nested $match. So what I would like to do is get the record with file id 12 and version 1.
I would ask also if is it a good practice have more the one nested array in mongoDB (like this object)...
Query:
db.collection.find({"my_uuid":"434343"},{"item":{$elemMatch:{"file_id":12,"changes":{$elemMatch:{"version":1}}}}}).pretty()
Object:
{
"my_uuid": "434343",
"item": [
{
"file_id": 12,
"no_of_versions" : 1,
"changes": [
{
"version": 1,
"commentIds": [
4,
5,
7
]
},
{
"version": 2,
"commentIds": [
10,
11,
15
]
}
]
},
{
"file_id": 234,
"unseen_comments": 3,
"no_of_versions" : 2,
"changes": [
{
"version": 1,
"commentIds": [
100,
110,
150
]
}
]
}
]
}
Thank you
If you want the entire documents that satisfy the criteria returned in the result, then I think it's fine. But if you want to limit the array contents of item and changes to just the matching elements, then it could be a problem. That's because, you'll have to use the $ positional operator in the projection to limit the contents of the array and only one such operator can appear in the projection. So, you'll not be able to limit the contents of multiple arrays within the document.
Im tring to set 0 the items.qty of a document obtains by a id query.
db.warehouses.update(
// query
{
_id:ObjectId('5322f07e139cdd7e31178b78')
},
// update
{
$set:{"items.$.qty":0}
},
// options
{
"multi" : true, // update only one document
"upsert" : true // insert a new document, if no existing document match the query
}
);
Return:
Cannot apply the positional operator without a corresponding query field containing an array.
This is the document that i want to set all items.qty to 0
{
"_id": { "$oid" : "5322f07e139cdd7e31178b78" },
"items": [
{
"_id": { "$oid" : "531ed4cae604d3d30df8e2ca" },
"brand": "BJFE",
"color": "GDRNCCD",
"hand": 1,
"model": 0,
"price": 500,
"qty": 0,
"type": 0
},
{
"brand": "BJFE",
"color": "GDRNCCD",
"hand": 1,
"id": "23",
"model": 0,
"price": 500,
"qty": 4,
"type": 0
},
{
"brand": "BJFE",
"color": "GDRNCCD",
"hand": 1,
"id": "3344",
"model": 0,
"price": 500,
"qty": 6,
"type": 0
}
],
"name": "a"
}
EDIT
The detail missing from the question was that the required field to update was actually in a sub-document. This changes the answer considerably:
This is a constraint of what you can possibly do with updating array elements. And this is clearly explained in the documentation. Mostly in this paragraph:
The positional $ operator acts as a placeholder for the first element that matches the query document
So here is the thing. Trying to update all of the array elements in a single statement like this will not work. In order to do this you must to the following.
db.warehouses.find({ "items.qty": { "$gt": 0 } }).forEach(function(doc) {
doc.items.forEach(function(item) {
item.qty = 0;
});
db.warehouses.update({ "_id": doc._id }, doc );
})
Which is basically the way to update every array element.
The multi setting in .update() means across multiple "documents". It cannot be applied to multiple elements of an array. So presently the best option is to replace the whole thing. Or in this case we may just as well replace the whole document since we need to do that anyway.
For real bulk data, use db.eval(). But please read the documentation first:
db.eval(function() {
db.warehouses.find({ "items.qty": { "$gt": 0 } }).forEach(function(doc) {
doc.items.forEach(function(item) {
item.qty = 0;
});
db.warehouses.update({ "_id": doc._id }, doc );
});
})
Updating all the elements in an array across the whole collection is not simple.
Original
Pretty much exactly what the error says. In order to use a positional operator you need to match something first. As in:
db.warehouses.update(
// query
{
_id:ObjectId('5322f07e139cdd7e31178b78'),
"items.qty": { "$gt": 0 }
},
// update
{
$set:{"items.$.qty":0}
},
// options
{
"multi" : true,
"upsert" : true
}
);
So where the match condition fins the position of the items that are less than 0 then that index is passed to the positional operator.
P.S : When muti is true it means it updates every document. Leave it false if you only mean one. Which is the default.
You can use the $ positional operator only when you specify an array in the first argument (i.e., the query part used to identify the document you want to update).
The positional $ operator identifies an element in an array field to update without explicitly specifying the position of the element in the array.
The document is like below.
{
"title": "Book1",
"dailyactiviescores":[
{
"date": 2013-06-05,
"score": 10,
},
{
"date": 2013-06-06,
"score": 21,
},
]
}
The daily active score is intended to increase once the book is opened by a reader. The first solution comes to mind is use "$" to find whether target date has a score or not, and deal with it.
err = bookCollection.Update(
{"title":"Book1", "dailyactivescore.date": 2013-06-06},
{"$inc":{"dailyactivescore.$.score": 1}})
if err == ErrNotFound {
bookCollection.Update({"title":"Book1"}, {"$push":...})
}
But I cannot help to think is there any way to return the index of an item inside array? If so, I could use one query to do the job rather than two. Like this.
index = bookCollection.Find(
{"title":"Book1", "dailyactivescore.date": 2013-06-06}).Select({"$index"})
if index != -1 {
incTarget = FormatString("dailyactivescore.%d.score", index)
bookCollection.Update(..., {"$inc": {incTarget: 1}})
} else {
//push here
}
Incrementing a field that's not present isn't the issue as doing $inc:1 on it will just create it and set it to 1 post-increment. The issue is when you don't have an array item corresponding to the date you want to increment.
There are several possible solutions here (that don't involve multiple steps to increment).
One is to pre-create all the dates in the array elements with scores:0 like so:
{
"title": "Book1",
"dailyactiviescores":[
{
"date": 2013-06-01,
"score": 0,
},
{
"date": 2013-06-02,
"score": 0,
},
{
"date": 2013-06-03,
"score": 0,
},
{
"date": 2013-06-04,
"score": 0,
},
{
"date": 2013-06-05,
"score": 0,
},
{
"date": 2013-06-06,
"score": 0
}, { etc ... }
]
}
But how far into the future to go? So one option here is to "bucket" - for example, have an activities document "per month" and before the start of a month have a job that creates the new documents for next month. Slightly yucky. But it'll work.
Other options involve slight changes in schema.
You can use a collection with book, date, activity_scores. Then you can use a simple upsert to increment a score:
db.books.update({title:"Book1", date:"2013-06-02", {$inc:{score:1}}, {upsert:true})
This will increment the score or insert new record with score:1 for this book and date and your collection will look like this:
{
"title": "Book1",
"date": 2013-06-01,
"score": 10,
},
{
"title": "Book1",
"date": 2013-06-02,
"score": 1,
}, ...
Depending on how much you simplified your example from your real use case, this might work well.
Another option is to stick with the array but switch to using the date string as a key that you increment:
Schema:
{
"title": "Book1",
"dailyactiviescores":{
{ "2013-06-01":10},
{ "2013-06-02":8}
}
}
Note it's now a subdocument and not an array and you can do:
db.books.update({title:"Book1"}, {"dailyactivityscores.2013-06-03":{$inc:1}})
and it will add a new date into the subdocument and increment it resulting in:
{
"title": "Book1",
"dailyactiviescores":{
{ "2013-06-01":10},
{ "2013-06-02":8},
{ "2013-06-03":1}
}
}
Note it's now harder to "add-up" the scores for the book so you can atomically also update a "subtotal" in the same update statement whether it's for all time or just for the month.
But here it's once again problematic to keep adding days to this subdocument - what happens when you're still around in a few years and these book documents grow hugely?
I suspect that unless you will only be keeping activity scores for the last N days (which you can do with capped array feature in 2.4) it will be simpler to have a separate collection for book-activity-score tracking where each book-day is a separate document than to embed the scores for each day into the book in a collection of books.
According to the docs:
The $inc operator increments a value of a field by a specified amount.
If the field does not exist, $inc sets the field to the specified
amount.
So, if there won't be a score field in the array item, $inc will set it to 1 in your case, like this:
{
"title": "Book1",
"dailyactiviescores":[
{
"date": 2013-06-05,
"score": 10,
},
{
"date": 2013-06-06,
},
]
}
bookCollection.Update(
{"title":"Book1", "dailyactivescore.date": 2013-06-06},
{"$inc":{"dailyactivescore.$.score": 1}})
will result into:
{
"title": "Book1",
"dailyactiviescores":[
{
"date": 2013-06-05,
"score": 10,
},
{
"date": 2013-06-06,
"score": 1
},
]
}
Hope that helps.