我可以使用Rails find_each方法,如：
User.find_each(:batch_size => 10000) do |user| ------ end
用find_each方法有没有办法得到数组的索引？喜欢 ：
User.find_each(:batch_size => 10000).with_index do |user,index| ------ end
解决方法
从
method definition可以看出,这是不可能的.
def find_each(options = {})
find_in_batches(options) do |records|
records.each { |record| yield record }
end
end
class User
def find_each(options = {})
find_in_batches(options) do |records|
records.each_with_index { |record| yield record,index }
end
end
end
User.find_each(:batch_size => 10000) do |user,index|
------
end
或使用实例变量.
index = 0 User.find_each(:batch_size => 10000) do |user| # ... index += 1 end