Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Login
Remember
Register
Ask
Q&A
All Activity
Hot!
Unanswered
Tags
Users
Ask a Question
Ask a Question
Categories
All categories
Topic[话题] (13)
Life[生活] (4)
Technique[技术] (2.1m)
Idea[创意] (3)
Jobs[工作] (2)
Others[杂七杂八] (18)
Code Example[编程示例] (0)
Recent questions tagged mongodb
0
votes
1.0k
views
1
answer
mongodb - Group by values and conditions
Very new to mongo and having a little trouble getting my head around this problem. I have collection looking ... and then order the results? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.3k
views
1
answer
mongodb - Return the last Document From a Lookup
db.groups.aggregate([ { $lookup: { from: "posts", localField: "_id", foreignField: "group", as: "post" ... last added post into post collection See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.5k
views
1
answer
mongodb - DbRef with Mongoose - mongoose-dbref or populate?
I have the following 2 schemas: Company Event: var companyEventSchema = new Schema({ name : String, description ... would be more efficient? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - Finding highest value from sub-arrays in documents
Let say I have the following collection: { _id: 1, Array: [ { K: "A", V: 8 }, { K: "B", V: ... returned to my client (like a normal query). See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - Query mongo to detect value changes in time series
Im wondering if the following is possible in MongoDB. I have collection of documents that represent changes in ... wrongly marked as duplicate. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.7k
views
1
answer
mongodb - Selecting and updating a nested object by it's ObjectId in Mongoose.js
I'm having trouble with something that thought would be trivial in MongoDB with Mongoose. With a fairly simple ... any help you can offer. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - can't connect to mongolab with node.js on heroku
I am having trouble making node.js and mongodb with mongolab work on heroku. I have read other issues like How do ... ; 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)
mongodb
0
votes
1.3k
views
1
answer
mongodb - Using mongo with FLASK and python
I am trying to learn python, mongodb and flask and am using the VERY EXCELLENT blog from Miguel Grinberg who ... place to start to build stuff See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.6k
views
1
answer
mongodb remove all dates less than specified
I have the following data. { deviceID: 186, date: "2014-3-15" } { deviceID: 186, date: "2014-3- ... documents with a date lower than specified. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.4k
views
1
answer
mongodb - Should I use the "allowDiskUse" option in a product environment?
Should I use the allowDiskUse option when returned doc exceed 16MB limit in aggregation? Or should I alter ... core/aggregation-pipeline-limits/ See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.1k
views
1
answer
mongodb - mongo.so: > undefined symbol: php_json_encode in Unknown on line 0. After installation mongo driver for php
After installation of Mongo 2.6.0 which was successful, I tried to upgrade php mongo driver on ubuntu 12.04 with ... an idea how to fix this? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.5k
views
1
answer
mongodb - query in mongo Shell gives SyntaxError: missing : after property
db.movieDetails.find( { year: 2013, imdb.rating: Pg-13, award.wins: 0 }, { title: 1, _id: 0 } ).pretty() ... ):1:60 Why? Thank you in advance! See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.4k
views
1
answer
mongodb how to change default port
For my project I need to use mongodb on port 80. In fact I can't use the default mongodb port (27017). I ... all work fine. Can someone help me? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.8k
views
1
answer
mongodb - Use mongoexport with a --query for ISODate
I have this query but i′m getting a syntax error: unexpected identifier mongoexport --db ium --collection events -- ... what can it be wrong? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.7k
views
1
answer
mongodb - How to update embedded document in mongoose?
I've looked through the mongoose API, and many questions on SO and on the google group, and still can't figure out ... v0.0.11 node v0.4.10 See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - Too many open files while ensure index mongo
I would like to create text index on mongo collection. I write db.test1.ensureIndex({'text':'text'}) and then i ... MaxOSX 10.9.1. Please help. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.1k
views
1
answer
mongodb - Obtaining $group result with group count
Assuming I have a collection called "posts" (in reality it is a more complex collection, posts is too simple ... ? Any help is appreciated. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.1k
views
1
answer
mongodb - Spring Data Mongo - apply unique combination fields in embedded document
I'm working on Spring Boot v2.1.3.RELEASE & Spring Data Mongo. In this example, I want to apply ... build(); employeeRepository.save(employee); See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - Mongo Triple Compound Index
If you have a double compound index { a : 1, b : 1}, it makes sense to me that the index won't be ... a multi-key index with good selectivity.) See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.3k
views
1
answer
mongodb - Mongo convert embedded document to array
Is there a way to convert a nested document structure into an array? Below is an example: Input "experience" : { ... a better way of doing this? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
2.3k
views
1
answer
mongodb - Mongoose expires property not working properly
the answer So it turns out when I was testing using the expires property in Mongoose, I successfully set a TTL index ... (also tested in 2.6.7) See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
887
views
1
answer
mongodb - How to join to two additional collections with conditions
select tb1.*,tb3 from tb1,tb2,tb3 where tb1.id=tb2.profile_id and tb2.field='<text>' and tb3.user_id = tb2 ... .. Any help will be appreciated.. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.3k
views
1
answer
mongodb - Calculate the average of fields in embedded documents/array
I want to calculate the rating_average field of this object with the rating fields inside the array ratings. Can you help me ... ": 3.5 } ] } See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - Can mongorestore take a single url argument instead of separate arguments?
If I have a mongo database URL of the following format mongodb://someUsername:
[email protected]
:27017/ ... .com/a/15865565/586086 See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.2k
views
1
answer
mongodb - best practice of django + PyMongo pooling?
I have a db = pymongo.Connection() call in Django's views.py for a simple MongoDB connection to ... max_pool_size parameter during connection? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.4k
views
1
answer
mongodb - Getting "err" : "E11000 duplicate key error when inserting into mongo using the Java driver
Exception in thread "main" com.mongodb.MongoException$DuplicateKey: { "serverUsed" : "localhost/127.0.0.1: ... myIdMapCollection.insert(myObj); See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.1k
views
1
answer
mongodb - Mongo find documents that do not contain a given value (using $not)
I have two items in MongoDB: {'title':'active item', 'tags':[ {'tag':'active'}, {'tag':'anothertag'} ... contain a given value in their tags? See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
0
votes
1.7k
views
1
answer
mongodb - Get first element in array and return using Aggregate?
How can I get and return the first element in an array using a Mongo aggregation? I tried using this code: ... need to return the first element. See Question&Answers more detail:os...
asked
Oct 24, 2021
in
Technique[技术]
by
深蓝
(
71.8m
points)
mongodb
Page:
« prev
1
2
3
4
5
6
7
8
...
26
next »
Ask a question:
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question
Just Browsing Browsing
[1] c++ - Trying to sum two large large numbers and don't get a result¡
[2] c++ - Missing
header file after installing gtkmm
[3] c# - Do embedded locks add any value against race conditions?
[4] Vue Router 获取 addRoutes 动态添加的路由
[5] Flutter有哪些好用的插件?
[6] 使用typescript的react项目中,如何声明antd的formRef的类型?
[7] r - Adding second layer to GloVe model in Keras
[8] javascript - Script loading: jQuery vs vanilla JS -- why a difference?
[9] c# - Trying to throw an item to my crosshair direction via ray
[10] javascript - How to Bring All of an Objects Properties ForeFront?
2.1m
questions
2.1m
answers
60
comments
56.8k
users
Most popular tags
javascript
python
c#
java
How
android
c++
php
ios
html
sql
r
c
node.js
.net
iphone
asp.net
css
reactjs
jquery
ruby
What
Android
objective
mysql
linux
Is
git
Python
windows
Why
regex
angular
swift
amazon
excel
algorithm
macos
Java
visual
how
bash
Can
multithreading
PHP
Using
scala
angularjs
typescript
apache
spring
performance
postgresql
database
flutter
json
rust
arrays
C#
dart
vba
django
wpf
xml
vue.js
In
go
Get
google
jQuery
xcode
jsf
http
Google
mongodb
string
shell
oop
powershell
SQL
C++
security
assembly
docker
Javascript
Android:
Does
haskell
Convert
azure
debugging
delphi
vb.net
Spring
datetime
pandas
oracle
math
Django
联盟问答网站-Union QA website
Xstack问答社区
生活宝问答社区
OverStack问答社区
Ostack问答社区
在这了问答社区
在哪了问答社区
Xstack问答社区
无极谷问答社区
TouSu问答社区
SQlite问答社区
Qi-U问答社区
MLink问答社区
Jonic问答社区
Jike问答社区
16892问答社区
Vigges问答社区
55276问答社区
OGeek问答社区
深圳家问答社区
深圳家问答社区
深圳家问答社区
Vigges问答社区
Vigges问答社区
在这了问答社区
DevDocs API Documentations
Xstack问答社区
生活宝问答社区
OverStack问答社区
Ostack问答社区
在这了问答社区
在哪了问答社区
Xstack问答社区
无极谷问答社区
TouSu问答社区
SQlite问答社区
Qi-U问答社区
MLink问答社区
Jonic问答社区
Jike问答社区
16892问答社区
Vigges问答社区
55276问答社区
OGeek问答社区
深圳家问答社区
深圳家问答社区
深圳家问答社区
Vigges问答社区
Vigges问答社区
在这了问答社区
在这了问答社区
DevDocs API Documentations
Xstack问答社区
生活宝问答社区
OverStack问答社区
Ostack问答社区
在这了问答社区
在哪了问答社区
Xstack问答社区
无极谷问答社区
TouSu问答社区
SQlite问答社区
Qi-U问答社区
MLink问答社区
Jonic问答社区
Jike问答社区
16892问答社区
Vigges问答社区
55276问答社区
OGeek问答社区
深圳家问答社区
深圳家问答社区
深圳家问答社区
Vigges问答社区
Vigges问答社区
在这了问答社区
DevDocs API Documentations
广告位招租
...