I have a collection that contains around 5000 documents. In each document there is field BrandID that I would like to change from string to MongoDB ObjectID. I have tried following shell command but it only updates first document. I dont get any error at all.
db.getCollection('SGProductRepository').find({ BrandID: {$ne : ""}}).forEach(function(obj) {
obj.BrandID = new ObjectId(obj.BrandID);
db.getCollection('SGProductRepository').save(obj);
})
Any idea why it is not working. I am using RoboMongo as an editor.
Thanks
Related
My question might be simple be here's some more context to it.
I have a MySQL DB, I've used an ETL tool to populate a MongoDBwith, however I couldn't manage to create proper ObjectId reference to it (I can only get a string of the ObjectId.
So far I've had an idea (maybe crazy but still.. could work)
I got this field populated like this in one document :
"field1" : "ObjectId('5d48845c456145ee9d1ccffde')",
What I would want to achieve through mongoDB is removing the first and last char to get (stripping the double quotes):
"field1" : ObjectId('5d48845c456145ee9d1ccffde'),
(note that MongoDB seems to automatically convert simple to Double quote after the change, so my reference become corret).
Problem is, I don't find anything close to a sort of Update script for MongoDB to achieve this.
Is there any way to do this ?
Using NodeJS could work, however, querying the document at this state doesn't return the field1 (probably cause it find it incorect)...
If its one time update, you can use the following query:
db.COLLECTION.aggregate([
{
$addFields:{
"field1":{
$toObjectId:{
$substrBytes:[
"$field1",
10,
24
]
}
}
}
},
{
$out:"COLLECTION"
}
])
In aggregation, the 'field1' is cast to ObjectId. Later on, the old data in the collection is replaced with the aggregated one.
I am trying to query a binary field in mongo db. The data looks like this:
{"_id":"WE8fSixi8EuWnUiThhZdlw=="}
I've tried a lot of things for example:
{ '_id': new Binary( 'WE8fSixi8EuWnUiThhZdlw==', Binary.SUBTYPE_DEFAULT) }
{ '_id': Binary( 'WE8fSixi8EuWnUiThhZdlw==', 0) }
etc
Nothing seems to be working, have exhausted google and the mongo documentation, any helper would be amazing.
UPDATE:
Now you should be able to query UUID and BinData from MongoDB Compass v1.20+ (COMPASS-1083). For example: {"field": BinData(0, "valid_base64")}.
PREVIOUS:
I see that you're using MongoDB Compass to query the field. Unfortunately, the current version of MongoDB Compass (v1.16.x) does not support querying binary data.
You can utilise mongo shell to query the data instead. For example:
db.collection.find({'_id':BinData(0, "WE8fSixi8EuWnUiThhZdlw==")});
Please note that the field name _id is reserved for use as a primary key; its value must be unique in the collection, and is immutable. Depending on the value of the binary that you're storing into _id, I would suggest to store the binary in another field and keep the value of _id to contain ObjectId.
I'm using mongodb v4.0.3, and this happens both with the shell and in compass.
This only happens with a certain collection. It previously had overriden ids (instead of the default mongodb id, there was a string. I dropped the collection and I recreated it without that).
I have the following structure ("mystructure"), for example:
{
"_id":ObjectId("5bd44eb528d61e3374b5e6ea"),
"custom_field":"data",
}
When I query it without a filter it returns all the docs:
db.mystructure.find({});
When I search for its objectid, it returns properly
db.mystructure.find( {"_id": ObjectId("5bd44eb528d61e3374b5e6ea")} );
But when I try to filter with any field, it doesn't return anything
db.mystructure.find( {"custom_field": "data"} );
At first I thought it would be solved recreating the collection with the automatically generated ids from mongodb but the problem persists. There are no "hidden" spaces in the string or anything like that. The same query in compass isn't working either. Other collections do work. It's on the same db, with the same user.
Why can this be?
Thank you very much.
you should write below code where 62c01e5a763d106152a2e53f is your _id
{_id:ObjectId('62c01e5a763d106152a2e53f')}
I have a collection list such:
{username: 'somename',
friendId: '57d725d6b8b144044602bf74' <-- This a reference objectId to another doc
}
When I query docs in my collection with criteria {friendId : '57d725d6b8b144044602bf74'} I get no results back .
Any other field query works fine.
I tried to convert the value to ObjectId('57d725d6b8b144044602bf74') even though the value is just a string, still no go.
Why am I failing to search for by that type of string ?
you are trying to achieve 'self-join' in mongoDB and you seems to rely on the _id field generated by mongodb.
i would suggest you to supply custom _ID fields to the document.
eg:
{_id:"alex", name:"alex", friendID:""}
{_id"john", name"john", friendID:"alex"}
and then you can execute your queries with ease on friendID field. Give it a shot and see if this make sense for your requirement.
This is such a weird problem. I think it has to do with how I am querying the document. It seems like the Meteor API has changed to query documents but the docs on the website are the same.
Here is a document in the database:
meteor:PRIMARY> db.studies.findOne()
{ "_id" : ObjectId("56c12e6537014a66b16771e7"), "name" : "Study 1" }
I have subscribed to get all documents and here is what I am trying in the console to get the documents.
var study = Studies.findOne() // This works.
It returns:
_id: MongoID.ObjectID
_str: "56c12e6537014a66b16771e7"
name: 'Study 1'
I just started a new Meteor project with React. I see that my collection is returning _id: MongoId.ObjectId
This is different, I have been using Meteor for awhile with Blaze and I can't remember it returning MongoID.ObjectID instead of just the string
But now if I try and find just that one document, it does not work.
var study = Studies.findOne("56c12e6537014a66b16771e7");
or
var study = Studies.findOne({_id: "56c12e6537014a66b16771e7"});
I am positive I am queuing for the right _id field. I have double checked the ID. Why does trying to find this one document not work?
Please let me know how I can query for a document. Has something changed with Meteor? The documentation still says you can search by id string.
You need to explicitly cast object id string to an ObjectID
var study = Studies.findOne({_id: new Meteor.Collection.ObjectID("56c12e6537014a66b16771e7")});
#Jaco has the correct answer, but I wanted to answer here to clarify what the higher level issue was.
The reason why my find query was not following syntax in Meteor docs is because I inserted the document into MongoDB directly, instead of through the Meteor API.
If you insert the document directly into MongoDB, you have to query the document using the syntax #Jaco mentioned in his answer.
Similar question: Meteor - Find a document from collection via Mongo ObjectId
So instead of changing my query code, I just deleted the document I inserted directly into MongoDB, and inserted a documented using the console in the browser.
Now I can query the document like normal.
So the root of the issue is that if you insert the document directly into MongoDB, you don't get the same type of document as you would if you insert the document using the Meteor API.