Menu
Lets say I have a Collection of users. Is there a way of using mongoid to find n random users in the collection where it does not return the same user twice? For now lets say the user collection looks like this:
class User
include Mongoid::Document
field :name
end
Simple huh?
Thanks
901
You can also use MongoDB's geospatial indexing feature to select the documents 'nearest' to a random number. This requires only one query and no null checks, plus the code is clean, simple and flexible. You could even use the Y-axis of the geopoint to add a second randomness dimension to your query.
Find() Method. In MongoDB, find() method is used to select documents in a collection and return a cursor to the selected documents. Cursor means a pointer that points to a document, when we use find() method it returns a pointer on the selected documents and returns one by one.
If you just want one document, and don't want to define a new criteria method, you could just do this:
random_model = Model.skip(rand(Model.count)).first
If you want to find a random model based on some criteria:
criteria = Model.scoped_whatever.where(conditions) # query example
random_model = criteria.skip(rand(criteria.count)).first
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
