ruby on rails - How do I update User object at scale? -


my ruby on rails application has 100,000,000 users. have column on model called 'data' json field contains small json object backup saving new field.

if had 1,000 users run:

users = user.all users.each |user|     user.data_backup = user.data     user.save end

and save existing data new column. however, potentially take forever many users. what's proper and/or efficient way update field on model @ scale when have 100,000,000+ users?

for large number of records, try use find_in_batchs method

user.find_in_batches(batch_size: 1000) |users|   users.each |user|     user.data_backup = user.data     user.save   end end

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