在嵌套的JSON参数

Question

我有一个字段loan_rate_legs，它是一个JSON类型

但是，我想将upperbound_rate，lowerbound_rate参数从STRING类型转换为Float类型

[
  ...
  "loan_rate_legs"=>
  [{"duration"=>"6M", "upperbound_rate"=>"1.2", "lowerbound_rate"=>"17.2"},
   {"duration"=>"16M", "upperbound_rate"=>"31.2", "lowerbound_rate"=>"17.2"}
    ]}
]

我使用以下强力params方法进行了手动转换，但它看起来很难看。

任何好的替代解决方案？

def loan_plan_params
  cleaned_params = params.require(:loan_plan).permit(
    :id, 
    :created_at, 
    :updated_at, 
    :loan_rate_legs => [:duration, :upperbound_rate, :lowerbound_rate]
  )
  cleaned_params['loan_rate_legs'] = cleaned_params['loan_rate_legs'].collect do |loan_rate_leg|
    {
      duration: loan_rate_leg["duration"],
      upperbound_rate: loan_rate_leg["upperbound_rate"].to_f,
      lowerbound_rate: loan_rate_leg["lowerbound_rate"].to_f,
    }
  end
  cleaned_params
end