I am not able to delete a document from MongoDB using Mongo Express when it has _id equal to NaN.
After pressing BIN button it says:
Document not found!
Any ideas how to manage it from Mongo Express?
Considering that the url and dateUpsertFromFile is not empty, I believe that the document do exist in the database. Perhaps incorrect data binding? You can do db.collection.remove({url: "Vista Room Near BBC Towers...<complete the url>"}) to delete it instead, but my previous point stands. You should be able to find the _id somewhere.
Related
I have tried to get the last saved documentId from the mongo database. But whatever I try I don't get anything back.
Can someone please hint me how to solve this in C# i have tried doing the sorts and take the last document but i don't get anything back.
MongoDB does not have such an operation.
If you want to know the id of inserted document, generate the id on the client side before inserting.
I have a mongodb collection called employeeInformation, in which I have two documents:
{"name1":"tutorial1"}, {"name2":"tutorial2"}
When I do db.employeeInformation.find(), I get both these documents displayed. My question is - is there a query that I can run to confirm that the collection contains only those two specified documents? I tried db.employeeInformation.find({"name1":"tutorial1"}, {"name2":"tutorial2"}) but I only got the id corresponding to the first object with key "name1". I know it's easy to do here with 2 documents just by seeing the results of .find(), but I want to ensure that in a situation where I insert multiple (100's) of documents into the collection, I have a way of verifying that the collection contains all and only those 100 documents (note I will always have the objects themselves as text). Ideally this query should work in mongoatlas console/interface as well.
db.collection.count()
will give you number of inserts once you have inserted the document.
Thanks,
Neha
Help!
I don't what am doing wrong, when I try to update an existing field using the $set method the entire document gets removed.
Can you kindly point out what I am doing wrong in my code:
recipientsDetails.update({_id: "GCYmFqZbaaYD7DvMZ"}, {$set: {paymentStatus: "Approved"}});
Thanks for your help!
The code is correct. It's likely that your publish function for recipientsDetails contains recipientsDetails.find({paymentStatus: "Not Approved"}). Naturally, once you update the document, the document will no longer satisfy that filtering query and the document vanish from the client.
Your code is correct.Check you mongoDB using Robomongo tool.connect your local project with robomongo and update a document then check whether it is updated or not? If the record updated there is an issue with the publish or subscriptions
I would like to find out how old/stale a collection is, I was wondering if there was a way to know when the last query was made to a collection, or even get a list of all collections last access date.
If your Mongodb collection document _id is of the following format "_id" : ObjectId("57bee0cbc9735bf0b80c23e0") then Mongodb stores the create document timestamp.
This can be retrieved by executing the following query
db.newcollection.findOne({"_id" : ObjectId("57bee0cbc9735bf0b80c23e0")})._id.getTimestamp();
the result would be an ISODate like this ISODate("2016-08-25T12:12:59Z")
find out how old/stale a collection
There is no predefined libraries available in mongodb to track the oldness of a collection. But it is doable by maintaining a log where we can keep an entry when we are accessing a collection.
References
ObjectID.getTimestamp()
Log messages
Rotate Log files
db.collection.stats()
I have some unused collections in the MongoDb database. I've to find out when the CRUD operations done against collections in the database. We have our own _id field instead of mongo's default object_id. We dont have any time filed in the collections to find out the modification time. is there any way to find out the modification time of collections in mongodb from meta data? Is there any data dictionay informations like in oracle to find out this? please give some idea/workarounds
To make a long story short: MongoDB has a flexible schema. Simply add a date field. Since older entries don't have it, they can not be the last entry.
Let's call that field mtime.
So after adding a date field to your schema definition, we generate an index in descending order on the new field:
db.yourCollction.createIndex({mtime:-1})
Finding the last mtime for a collection now is easy:
db.yourCollection.find({"mtime":{"$exists":true}}).sort({"mtime":-1}).limit(1)
Do this for every collection. When the above query does not return a value within the timeframe you defined for purging a collection, simply drop it, since it has not been modified since you introduced the mtime field.
After your collections are cleaned up, you may remove the mtime field from your schema definition. To remove it from the documents, you can run a simple query:
db.yourCollection.update(
{ "mtime":{ $exists:true} },
{ "$unset":{ "mtime":""} },
{ multi: true}
)
There is no "data dictionary" to get this information in MongoDB.
If you've enabled the profiling level in advance to log all operations (db.setProfilingLevel(2)) and you haven't had many operations to log, so that the system.profile capped collection hasn't overwritten whatever logs you are interested in, you can get the information you need there—but otherwise it's gone.