[英]Rails - how to fetch from ActiveRecord object only specific records?
[英]How to fetch records in batches in rails for a specific condition?
我正在編寫一個rake任務,以填充“產品”對象記錄。 我目前的邏輯是
namespace :populate_product do
desc "This task is to populate product object, with product ID"
task populate_coaching_product_id: :environment do
UserProduct.find_each(batch_size: 10_000) do |user_product|
user_product.save
end
end
end
現在在上面的查詢中,我想獲取從現在開始90天之前創建的記錄。 如何更改以上查詢?
引用此
就像是
Person.where("age > 21").find_in_batches do |group|
sleep(50) # Make sure it doesn't get too crowded in there!
group.each { |person| person.party_all_night! }
end
對於90天后創建的記錄
UserProduct.where('created_at <= ?', Time.now - 90.days ).find_each(batch_size: 10000) do |user_product|
user_product.save
end
你可以試試:
UserProduct.where('created_at >= ?', Time.now - 90.days ).find_each(batch_size: 10_000) do |user_product|
user_product.save
end
注意:如果您不關心小時和分鍾,可以使用:
Date.today - 90.days
希望這可以幫助。
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