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mongodb - Dynamic attributes with Rails and Mongoid
    I'm learning MongoDB through the Mongoid Ruby gem with Rails (Rails 3 beta 3), and I'm trying to ... this without an undefined method error? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - How to query from within Mongoose pre hook in a Node.js / Express app?
    I'm building a basic blog in Node.js / Express using MongoDB w/ Mongoose ORM. I have a pre 'save' hook that I ... console.log(idea); next(); }); See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - mongoexport aggregate export to a csv file
    I want to save the result from an aggregation into a csv file. Using the mongo cmd line tool I can do this ... that saves results into a csv? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Mongorestore to a different database
    In MongoDB, is it possible to dump a database and restore the content to a different database? For example like this ... /db1", skipping... done See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - mongo 3 duplicates on unique index - dropDups
    In the documentation for mongoDB it says: "Changed in version 3.0: The dropDups option is no longer available." ... the time I'm done indexing. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Are document-oriented databases meant to replace relational databases?
    Recently I've been working a little with MongoDB and I have to say I really like it. However it is a ... relational database (or vice-versa)? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Truncate a collection
    How do I truncate a collection in MongoDB or is there such a thing? Right now I have to delete 6 ... millions of entries in the collections. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb queries both with AND and OR
    can I use combination of OR and AND in mongodb queries? the code below doesn't work as expected db.things.find({ $and ... I'm using mongo 1.8.3 See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - How to set docker mongo data volume
    I want to use Dockerizing MongoDB and store data in local volume. But .. failed ... It has mongo:latest images ... can't. Who can help me? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Meteor app — resetting a deployed app's DB
    Is there a simple way to reset the data from a meteor deployed app? So, for example, if I had deployed an ... of what to do in production. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - server returned error on SASL authentication step: Authentication failed
    The following is my MongoDB connection dial from GoLang. But it's returning a panic "server returned error on SASL ... nil) { panic(err) } See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - limits of number of collections in databases
    Can anyone say are there any practical limits for the number of collections in mongodb? They write here https:// ... very much for your answers. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Unable to start/launch local mongo db
    I'm new to MongoDB. I currently have a dump of a mongo db (i.e. directory of .bson files) and am ... understand what's going on. Any help? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Storing Directory Hierarchy in a Key-Value Data store
    What is a clean/efficient method for storing the directory Hierarchy/tree in a Key-Value database (in my case ... structure in a KV store? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.1k views
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mongodb - Accessing Meteor production database
    To check out what's in the (production) database for blah.meteor.com I thought we would just do: meteor mongo -- ... this URI to access the db? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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920 views
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mongodb - In Mongo what is the difference between sharding and replication?
    Replication seems to be a lot simpler than sharding, unless I am missing the benefits of what sharding is ... both provide horizontal scaling? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Mongoose schema: 'unique' not being respected
    I'm trying to use Mongoose with this schema var RestoSchema = new Schema({ "qname" : {type: String, required: true, ... true, "safe" : null } ] See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Mongo DB Java 3.x Driver - Group By Query
    I'd like to learn how to implement group by query using Mongo DB Java 3.x Driver. I want to group my ... of the documents the collection has. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Get values as array of elements after $lookup
    For MongoDB, when using $lookup to query more than one collection, is it possible to get a values-only list for a ... :"bars" } }).pretty() See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.2k views
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mongodb - $project: Is it possible to access a property of an expression result in just one single stage?
    Is there any way to carry out the following operation in just one $project stage? db.getCollection('users').aggregate ... .domain" } } ]) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Unable to display only the points within a specific range (circle) using the .getBounds() function (Leaflet)
    I am trying to display a certain amount of points within a specific range, that is within a circle. But ... particular issue? Thanks for helping See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.5k views
1 answer
mongodb - How to sort sub-documents in the array field?
    I'm using the MongoDB shell to fetch some results, ordered. Here's a sampler, { "_id" : "32022", "topics" : [ ... . is there a way to do this? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - Mongoose update not updating: { ok: 0, n: 0, nModified: 0 }
    I have a collection named "permissions" on MongoDB. I want to implement a simple update like this: let schema = new ... . What am I doing wrong? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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mongodb - How to exclude from search results documents with fields which are not present in query?
    I have two documents: { p1:"a", p2:"b" } { p1:"a", p2:"b", p3:"c" } What I should to do ... query) it should not be presented in search results. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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958 views
1 answer
mongodb - Select data where the range between two different fields contains a given number
    I want to make a find query on my database for documents that have an input value between or equal to these 2 fields, ... .397Z"), "__v" : 0 } See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.1k views
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mongodb - Google Cloud Mongo DB: External IP not connecting
    I have created a ready to go MongoDB server on Google Cloud using the default parameters. Everything is working ... /mongo/shell/mongo.js:148 See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.2k views
1 answer
mongodb - Mongo DB find all records with highest value depending on a key field
    I would like to get for each user in my collection the comment of the record with the highest value. // ... both the values present in my_list See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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1.1k views
1 answer
mongodb - $elemMatch and update
    I would like to update a subdocument that was fetched using $elemMatch. I've found some posts online but so ... matching address then save it. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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