Finding mongoDB records in batches (using mongoid ruby adapter)

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With Mongoid, you don’t need to manually batch the query.

In Mongoid, Model.all returns a Mongoid::Criteria instance. Upon calling #each on this Criteria, a Mongo driver cursor is instantiated and used to iterate over the records. This underlying Mongo driver cursor already batches all records. By default the batch_size is 100.

For more information on this topic, read this comment from the Mongoid author and maintainer.

In summary, you can just do this:

Model.all.each do |r|
  Sunspot.index(r)
end

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