Rails save massive hash data to database

问题

I have a Hash with 2M data. I need to transfer all data from hash to database. Hash keys fit with database columns.

I'm not sure the way I use below is the best way.

# users is a hash with 2M data.
users.each do |u|
   user = User.new(u)
   user.save!
end

what is the best way to iterate through this kind of massive data with Rails?

回答1:

ActiveRecord.create accepts hashes too. Therefore I would just try:

User.create(users)

2M might be a bit too big and you might need to work in batches. But I suggest this to be faster than one insert per record.

回答2:

Try using active record import gem(https://github.com/zdennis/activerecord-import#hashes). You can even insert records with batching(https://github.com/zdennis/activerecord-import#batching)

User.import(users, batch_size: 1000)

来源：https://stackoverflow.com/questions/57596533/rails-save-massive-hash-data-to-database