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    I googled and all others, but I didn't find the answer. The question is: Hi, how can I do batch insert with Mongoid to MongoDB? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    What's the best practice (or tool) for updating/migrating Mongoose schemas as the application evolves? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    How can documents be moved from one collection to another collection in MongoDB?? For example: I have lot of ... be used to move documents? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I develop a new website and I want to use GridFS as storage for all user uploads, because it offers a lot of ... use it for a new project? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    How to I get mongo to use a mounted drive on ec2? I really do not understand. I attached a volume on ec2 ... 16:59:15 dbexit: really exiting now See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I want to use $or and $regex operators same time. db.users.insert([{name: "Alice"}, {name: "Bob"}, {name: ... /.../ (real regular expressions). See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    How to get the last element of an array based on a condition in mongodb? I am unable to use slice. Here is ... records above, it should be 3. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am using mongoDB in which I have collection of following format. {"id" : 1 , name : x ttm : 23 , val : ... per id. Is it possible in mongodb? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a trouble(/(ㄒoㄒ)/~~). Suppose that collection A is { "_id" : ObjectId("582abcd85d2dfa67f44127e1"), " ... work. Anybody can help? Thanks. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a collection of users where each document has following structure: { "_id": "<id>", "login": " ... for exclusion Thank you in advance See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I'm currently using a mongodb with mgo lib for a web application, but I'm not sure if the way I'm using it, ... or this one is fine ..? Thanks See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Lets say I have mongo documents like this: Question 1 { answers:[ {content: 'answer1'}, {content: '2nd answer'} ... is native way to do it? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Everybody. In mongo group query, the result shows only the key(s) in arguments. How to keep the first document in each ... ", "count" : 1 } ] See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am working with Mongo DB and I am a newbie to it. I am about to install it on a server specifically for ... with Mongo DB and if so, how? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I've found this question answered for C# and Perl, but not in the native interface. I thought this would work: ... It seems pretty normal to me. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a JSON file consisting of about 2000 records. Each record which will correspond to a document in ... Can someone recommend a solution? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I'm trying to run a $graphLookup like demonstrated in print bellow: The objective is to, given a specific record ... Docker) Thanks in advance! See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am new to aws and mongodb at the same time, so I'm stuck at a very basic point in trying to connect to my ... parsed I'm using mongodb 3.6.5. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a collection I'm unable to drop, I'm assuming that the "-" in its name is a special character. In ... ) and a slash, but nothing works. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I know how to sort queries in MongoDB by multiple fields, e.g., db.coll.find().sort({a:1,b:-1}). Can I sort ... between a and b (a-b)? Thanks! See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a problem where I want to be able to get all the unique cities for a collection, and my code ... collections return if at all possible. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Update: follow-up to MongoDB Get names of all keys in collection. As pointed out by Kristina, one can use Mongodb 's ... ","hello","type"] Thank you in advance! Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I would like to define a $project aggregation stage where I can instruct it to add a new field and include ... to avoid having to list every field separately? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I have a data like this in mongodb { "latitude" : "", "longitude" : "", "course" : "", "battery" : " ... it returns the above data result to me from the db? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I want to make a publication with several additional fields, but I don't want to either use Collection.aggregate and lose ... me if this is the right way to go? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    Ok, still in my toy app, I want to find out the average mileage on a group of car owners' odometers. ... just overlooked something. What would that be? Thanks! Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I am coming from riak and redis where I never had an issue with this services starting, or to interact. This is a ... ] end connection 10.29.16.208:5321 (1 conn Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    In previous versions of Mongoose (for node.js) there was an option to use it without defining a schema var ... way to use schema-less models in mongoose? Question&Answers:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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