计算 Ruby 模型中的比率

发布于 2024-10-26 20:01:39 字数 634 浏览 1 评论 0原文

你好，我正在为当地的一个非政府组织开发一个数据输入系统，该系统对森林中的鸟类进行调查。我有四个模型，即 Bird、Location、Report 和 Ratio。而伯德和位置只是普通模型，只有名称字段，我的报告字段如下。

class Report < ActiveRecord::Base

  hobo_model # Don't put anything above this

  fields do
    Date    :date
    Plumage enum_string(:Breeding, :NonBreeding )
    Weather enum_string(:Cloudy, :Sunny, :Humid)
    Time enum_string(:Dawn, :Morning, :Noon, :Evening, :Dusk, :Night)
    timestamps
  end

  belongs_to :bird
  belongs_to :location

end

在比率模型中，我需要计算以下逻辑的比率。

假设在位置 L 发现了一只鸟 X，则该比率应等于鸟 X 在 L 处向 L 报告的鸟类报告总数。如何获取数据从数据库导入比率模型？

原文

Hi, I am doing a data entry system for a local NGO here which conducts surveys about bird in forests. I have four models namely, Bird, Location, Report and Ratio. While Bird & Location are just plain models with only a name field, my report field is as follows.

class Report < ActiveRecord::Base

  hobo_model # Don't put anything above this

  fields do
    Date    :date
    Plumage enum_string(:Breeding, :NonBreeding )
    Weather enum_string(:Cloudy, :Sunny, :Humid)
    Time enum_string(:Dawn, :Morning, :Noon, :Evening, :Dusk, :Night)
    timestamps
  end

  belongs_to :bird
  belongs_to :location

end

And in the ratio model I need to calculate a ratio for the following logic.

Given a scenario that a bird X is found at a location L, the ratio
should be equal to number of times bird X is reported at L to the
number of total bird reports reported at L. How do I fetch the data
from the database into the ratio model?

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