Ruby Import Large Amounts of Data in Bulk

Sometimes you have to import a large amount of data. If you were to do this brute force, you would do it like this:

10.times do |num|
  Example.create(favorite_numer: num)
end

The problem is it will do 10 different transactions. This might not seem bad, but if you were doing a million, it will take a very long time.

There is an amazing gem activerecord-import that makes massive import fast and on a single transaction. It looks like this:

examples = []
10.times do |num|
  example.push Example.new(favorite_numer: num)
end

Example.import examples

There you go. It is that simple, and will be extremely fast.