activerecord - Rails 4: find all records -

now activerecord::relation#all deprecated in rails 4, how supposed iterate records?

used like:

foo.all.each |foo|   # whatever end 

i can approximate so, feels dirty:

foo.where(true).each |foo|   # whatever end 

is there better way?

according rails guide on active record query interface, correct way iterate through records using find_each.

using foo.all.each load entire table memory, instantiating rows; iterate through instances. find_each in batches, more efficient in terms of memory usage.

from guide:

the find_each method retrieves batch of records , yields each record block individually model. in following example, find_each retrieve 1000 records (the current default both find_each , find_in_batches) , yield each record individually block model. process repeated until of records have been processed:

user.find_each |user|   newsletter.weekly_deliver(user) end 

references:

• active record query interface
• activerecord::batches