[英]How to create multiple model instances at once in Rails
我有這樣的方法:
codes.each do |code|
company = Company.find_or_create_by(code: code)
company.foo = some_value
company.bar = some_value2
company.save
end
為了使其更快,我想用update_all
編寫它
codes.each do |code|
Company.find_or_create_by(code: code)
Company.where(code: code).update_all(foo: some_value, bar: some_value2)
end
但是find_or_create_by
每次都會執行SQL命令。 有沒有辦法一次創建多個模型實例?
我想寫像Company.create_all_if_not_exist(code: codes)
。
我看到一個更好的方法:
existing_companies = Company.where(code: codes)
existing_codes = existing_companies.pluck(:code) # +1 request
non_existing_codes = codes - existing_codes
attrs = {foo: some_value, bar: some_value2}
existing_companies.update_all(attrs) # +1 request
# + (codes - existing_codes) requests
non_existing_codes.each do |code|
Company.create({code: code}.merge(attrs))
end
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