Questions tagged [mongoid]
Mongoid is the official Ruby Object-Document-Mapper (ODM) for MongoDB.
4,733
questions
98
votes
3
answers
27k
views
How to implement has_many :through relationships with Mongoid and mongodb?
Using this modified example from the Rails guides, how does one model a relational "has_many :through" association using mongoid?
The challenge is that mongoid does not support has_many :through as ...
- 8,655
87
votes
3
answers
43k
views
Select where not null or empty in mongoid
I modified a model so it includes a new field, such as...
field :url, :type => String
I use activeadmin, so when I create a new entry @model.url is empty, and in entries created before changing ...
- 71.6k
85
votes
4
answers
99k
views
Difference between "id" and "_id" fields in MongoDB
Is there any difference between using the field ID or _ID from a MongoDB document?
I am asking this, because I usually use "_id", however I saw this sort({id:-1}) in the documentation: http://www....
- 12k
83
votes
14
answers
21k
views
Mongoid or MongoMapper? [closed]
I have tried MongoMapper and it is feature complete (offering almost all AR functionality) but i was not very happy with the performance when using large datasets. Has anyone compared with Mongoid? ...
- 3,866
73
votes
2
answers
11k
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Using Active Record generators after Mongoid installation?
I'm using MongoDB via Mongoid integration, as well as ActiveRecord in a project. I would like to generate migrations for active record, and Mongoid is the default when I run.
rails g migration
Any ...
- 13.5k
66
votes
3
answers
160k
views
MongoDB: count the number of items in an array
I have a collection where every document in the collection has an array named foo that contains a set of embedded documents. Is there currently a trivial way in the MongoDB shell to count how many ...
- 47.8k
48
votes
7
answers
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ERROR Original Error: ImageMagick/GraphicsMagick is not installed
I have an app that is using Imagemagick, but I had to rebuild my environment and now when I try and upload an avatar (which is why I am using Imagemagick), it keeps giving me the following error when ...
- 1,599
47
votes
5
answers
25k
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Mongoid OR query syntax
This must be asked alot but it is very poorly documented. There is no mention at http://mongoid.org/en/mongoid/docs/querying.html
I'm trying to check whether a user exists (below is an AND query), ...
- 75.6k
47
votes
3
answers
21k
views
How can I disable MongoDB log messages in console?
I have this little test script:
require 'mongo'
mongo_client = Mongo::Client.new(['127.0.0.1:27017'], :database => 'test')
mongo_client[:collection].insert_one({a: 1})
An this is the console ...
- 813
42
votes
6
answers
23k
views
Finding mongoDB records in batches (using mongoid ruby adapter)
Using rails 3 and mongoDB with the mongoid adapter, how can I batch finds to the mongo DB? I need to grab all the records in a particular mongo DB collection and index them in solr (initial index of ...
- 4,361
41
votes
4
answers
22k
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Batch insert/update using Mongoid?
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?
- 10.1k
41
votes
1
answer
10k
views
Difference between embeds_many and has_many in mongoid
Can anyone explain to me the difference between embeds_many and has_many in mongoid?
- 671
41
votes
3
answers
11k
views
How can I see raw mongoDB queries with Mongoid
I followed this page to see mongoDB queries. As a result I could see Moped log.
But I can't see raw mongoDB queries.
How can I display MongoDB queries in the rails console/server
I did like the below....
- 793
40
votes
5
answers
32k
views
Mongoid Rails 4 sort by asc or desc order created_at
I have a rails 4 app using Mongoid.
I want to do something basic is display the book model I have by descending order according to the field created_at in the index view.
In the controller ...
- 935
40
votes
4
answers
51k
views
What is the length maximum for a string data type in MongoDB used with Ruby?
I wasn't able to find any information on the max length for a string data type in MongoDB on the main mongodb.org site. I'm coming from a relational database background and there are usually max ...
- 3,075
37
votes
2
answers
11k
views
Factory Girl + Mongoid embedded documents in fixtures
Let’s say you have the following mongoid documents:
class User
include Mongoid::Document
embeds_one :name
end
class UserName
include Mongoid::Document
field :first
field :...
- 5,498
36
votes
3
answers
34k
views
Is it bad to change _id type in MongoDB to integer?
MongoDB uses ObjectId type for _id.
Will it be bad if I make _id an incrementing integer?
(With this gem, if you're interested)
- 1,118
36
votes
3
answers
7k
views
Mongoid 3 + Heroku (MongoHQ) cause Moped::Errors::OperationFailure
With Rails 3, after upgrading from Mongoid 2.x to Mongoid 3.x, my Heroku + MongoHQ setup stopped working. Funny thing is, that my development & test frameworks and my whole test suite passes just ...
- 840
33
votes
3
answers
61k
views
How to deal with the timezone issue when storing dates in utc using mongod?
I have a mongodb collection where each document has some attributes and a utc timestamp. I need to pull out data from the collection and use the aggregation framework because I use the data from the ...
- 7,128
33
votes
4
answers
8k
views
Mongo ids leads to scary URLs
This might sound like a trivial question, but it is rather important for consumer facing apps
What is the easiest way and most scalable way to map the scary mongo id onto a id that is friendly?
xx....
- 27.8k
32
votes
7
answers
23k
views
How to query MongoDB directly from Ruby instead of using Mongoid?
I am writing a migration for a Rails application that uses MongoDB and Mongoid. My migration currently uses my models that use Mongoid to query and update records, but the performance is sub-par. I am ...
- 233k
32
votes
3
answers
7k
views
Mongoid finders not working?
I have set up a rails3+mongoid application and when I open the rails console, none of the finders seem to work - http://d.pr/FNzC
User.all
User.find(:all, :conditions => { first_name => "John" }...
- 841
31
votes
4
answers
14k
views
Retrieving array of ids in Mongoid
how do you retrieve an array of IDs in Mongoid?
arr=["id1","id2"]
User.where(:id=>arr)
You can do this easily if you are retrieving another attribute
User.where(:nickname.in=>["kk","ll"])
...
- 27.8k
31
votes
1
answer
21k
views
Mongoid / Mongodb and querying embedded documents
I have Author and Book models.
An Author has many embedded Books.
Can I query the embedded Books, or do I have to fetch Authors first to get Books?
- 341
31
votes
3
answers
3k
views
Rails, Mongoid & Unicorn config for Heroku
I am using Mongoid 3, with Rails 3.2.9 and Unicorn for production. Would like to setup a before_fork & after_fork for the connection to mongodb, found the following code for active record:
...
- 3,902
29
votes
5
answers
17k
views
Rails 3: undefined method `page' for #<Array:0xafd0660>
I can't get past this. I know I've read there isn't a page method for arrays but what do I do?
If I run Class.all in the console, it returns #, but if I run Class.all.page(1), I get the above error.
...
- 2,918
28
votes
3
answers
9k
views
How to get the resultant array from a Mongoid::Criteria without an "each" block
Our application uses ajax very heavily and as a result of this we have statements like var items = #{@items.to_json} in all our views. Now @items is being set in the controller as @items=Item.all. The ...
- 6,693
28
votes
1
answer
16k
views
Query on Mongoid Hash Field
I want to query on a Hash field for a Mongoid Class. I'm not sure how I can do this with conditions?
Here is an example:
class Person
include Mongoid::Document
field :things, :type => Hash
...
- 39k
27
votes
3
answers
8k
views
Set default database connection Rails
My rails app has its own MySql database (and requires the mysql2 gem) but also needs to connect with an external MongoDB database for one particular model (and so I've included mongoid and bson_ext in ...
- 12.1k
27
votes
1
answer
9k
views
Mongoid Scope Check If Array Field Contains Value
The solution for this question might look pretty simple, but I've been waving around with no answer.
I'm using Mongoid in my Rails 4.1.4 app. I have a model which contains an Array field that will ...
- 1,620
26
votes
3
answers
17k
views
MongoID Data Type for TEXT
Whats the best option to use for MongoID data type for the regular MongoDB TEXT data type.
Wondering why MongoID doesnt have a data type TEXT.
is it okay to use STRING type and store large amounts ...
- 54.5k
26
votes
1
answer
8k
views
What inverse_of does mean in mongoid?
What inverse_of does mean in mongoid associations? What I can get by using it instead of just association without it?
- 14.7k
26
votes
3
answers
10k
views
Managing mongoid migrations
Can someone give me a short introduction to doing DB migrations in Rails using Mongoid? I'm particularly interested in lazy per document migrations. By this, I mean that whenever you read a document ...
- 28.2k
26
votes
4
answers
8k
views
How can I use Mongoid and ActiveRecord in parallel in Rails 3?
I'm using rails 3, and began my application with ActiveRecord. Now, I have many models, and the relations are starting to get complicated, and some could be more simply expressed with a Document-...
- 16k
23
votes
5
answers
18k
views
Use LIKE/regex with variable in mongoid
I'm trying to find all documents whose text contains the word test. The below works fine:
@tweets = Tweet.any_of({ :text => /.*test.*/ })
However, I want to be able to search for a user supplied ...
- 683
22
votes
5
answers
13k
views
How to skip callbacks on Mongoid Documents?
My question is similar to this one How to skip ActiveRecord callbacks? but instead of AR I'm using Mongoid, It seems like that isn't implemented yet in the current version of Mongoid, so I'd like to ...
- 7,523
22
votes
2
answers
17k
views
Mongoid not in query
I have some trouble with mongoid:
test "Test candidate" do
User.create(:id => 1, :sex => User::Male, :country => 1, :city => 1)
User.create(:id => 2, :sex => User::Female, ...
- 5,179
22
votes
6
answers
5k
views
Pros and cons of using callbacks for domain logic in Rails
What do you see as the pros and cons of using callbacks for domain logic? (I'm talking in the context of Rails and/or Ruby projects.)
To start the discussion, I wanted to mention this quote from the ...
- 32.2k
22
votes
5
answers
11k
views
How to reference an embedded document in Mongoid?
Using Mongoid, let's say I have the following classes:
class Map
include Mongoid::Document
embeds_many :locations
end
class Location
include Mongoid::Document
field :x_coord, :type => ...
- 278
22
votes
2
answers
34k
views
Collection ID length in MongoDB
i am new to mongodb and stack overflow.
I want to know why on mongodb collection ID is of 24 hex characters?
what is importance of that?
- 384
22
votes
1
answer
3k
views
Heroku & MongoHQ: ActionView::Template::Error (The operation: #<Moped::Protocol::Commands::Authenticate failed with error "auth fails")
I have a Rails 3 app with MongoID 3 deployed successfully to Heroku (using MongoHQ) -- but then something happened (cannot pinpoint what exactly it was) and the build started crashing on Heroku.
So ...
- 840
21
votes
3
answers
6k
views
Mongo DB Design, embedding vs relationships
I'm building a simple accounting system where a user has many bills. Now I'm trying to decide if bills should be its own collection, or nested within the user. I'm leaning towards the former but I'...
- 32.1k
20
votes
4
answers
13k
views
How can I get all field names of the Mongoid Document?
I'm building backend system, as written in Iain Hecker's tutorial: http://iain.nl/backends-in-rails-3-1 and I try to adapt it to MongoDB with Mongoid.
So when I need to write in backend/...
- 349
20
votes
6
answers
31k
views
Creating short, unique object id's in MongoDB
I'm making an app similar to instagram using Rails/Mongoid. I want a unique ID that I can use in a url like http://instagr.am/p/DJmU8/
What's the easiest way to do that? Can I derive such an ID from ...
- 5,855
20
votes
3
answers
13k
views
Querying embedded objects in Mongoid/rails 3 ("Lower than", Min operators and sorting)
I am using rails 3 with mongoid.
I have a collection of Stocks with an embedded collection of Prices :
class Stock
include Mongoid::Document
field :name, :type => String
field :code, :type =&...
- 537
19
votes
4
answers
17k
views
Mongoid query for array field
I have a category field of type Array in Mongoid.
Ex. category: ["val1","val2","val3"]
Now I want to query this Model with `category: ["val1","val2"] such that it returns me the merge of
...
- 2,540
19
votes
2
answers
8k
views
Getting actual array of results using Mongoid
With a regular ActiveRecord/SQL setup in Rails, in console when I execute commands *.where, *.all etc., I get back the actual array of record items. However, after switching to Mongoid, I instead get ...
- 39.6k
19
votes
2
answers
8k
views
See existing indexes in MongoDB using mongoid
I'd like to see the existing indexes used by MongoDB. Can I do the equivalent of
$ mongod
> use my_db
> db.system.indexes.find()
using Mongoid?
$ rails console
> ?
Would be convenient ...
- 39.7k
19
votes
5
answers
6k
views
How to do proper database testing (TDD) on Rails 3 using MongoDB and Mongoid
How would go about writing proper unit testing (and integration testing for that matter) using MongoDB through Mongoid on Rails ?
I am asking, because to the opposite of using let's say SQLite3, even ...
- 4,447
18
votes
5
answers
26k
views
Querying last 30 days date range with Mongoid and Ruby?
How do I go about querying a date range (of say the last 30 days from now) with Mongoid and Ruby?
I need to end up with an array or hash like the following:
{
15 => 300,
14 => 23,
...
- 2,902