如何在Rails中一次保存多条记录？

Question

如何使用Rails在一次调用中保存此数组？

tax_rates = [{
  :income_from => 0
  :income_to  => 18200
  :start => "01-07-2013"
  :finish => "30-06-2014"
  :rate => nil
  :premium => nil
  },{
  :income_from => 18201
  :income_to  => 37000
  :start => "01-07-2013"
  :finish => "30-06-2014"
  :rate => 0.19
  :premium => nil
  },{
    :income_from => 18201
    :income_to  => 37000
    :start => "01-07-2013"
    :finish => "30-06-2014"
    :rate => 0.19
    :premium => nil
    }]

我可以打电话Rails.create(tax_rates)吗？

还有,有没有办法删除重复的符号,使它们看起来更整洁？

Answer 1

你的例子几乎是正确的.

使用ActiveRecord::Persistence#create,可以接受哈希数组作为参数.

tax_rates = [
  {
    income_from: 0,
    income_to: 18200,
    start: "01-07-2013",
    finish: "30-06-2014",
    rate: nil,
    premium: nil,
  },
  {
    income_from: 18201,
    income_to: 37000,
    start: "01-07-2013",
    finish: "30-06-2014",
    rate: 0.19,
    premium: nil,
  },
  # ...
]

TaxRate.create(tax_rates)  # Or `create!` to raise if validations fail

Answer 2

tax_rates.map {|tax_rate| TaxRate.new(tax_rate).save } 

这样你就可以检索一个数组,true并false知道哪个成功了,哪个没有成功.

Answer 3

如果你想要保存所有这些,或者即使一个失败也不保存它们,你可以使用'ActiveRecord :: Base.transaction'

例如

ActiveRecord::Base.transaction do  
   tax_rate.each do |tax_rt|  
       TaxRate.new(tax_rt).save  
    end
 end