如何在 ruby on rails oop 中复合 csv 文件数据答案

【问题标题】：How can compound csv file datas in ruby on rails oop如何在 ruby on rails oop 中复合 csv 文件数据
【发布时间】：2021-08-21 21:00:00
【问题描述】：

我想在 ruby on rails 中复合数据。

我有一个 department.csv 文件，它是这样的：

我也有 person.csv 文件，它是这样的：

现在，我有这门课：

filepath = "#{__dir__}/../csv/department.csv"
CSV.foreach(filepath, headers: true) do |row|
  department = Department.new(
    row["name"],
    row["midterm_score_ratio"],
    row["final_score_ratio"],
    row["minimum_passing_score"],
    row["university_name"],
    "students",
    "teachers"
  )
  department.print_department_name
end

这里，department.csv 文件中不存在学生和教师。我需要从 person.csv 文件中获取它。但是，部门也很重要。例如，如果这个人学习数学，那么这里的“学生”必须是数学学生。如何在 ruby on rails 中使用 OOP 来做到这一点？

【问题讨论】：

标签： ruby-on-rails ruby csv

【解决方案1】：

在解析deparment.csv之前，需要将学生和教师按部门分组，然后将其粘贴到部门初始化中。它看起来像：

# export people from person.csv
people = []
filepath = "#{__dir__}/../csv/person.csv"
CSV.foreach(filepath, headers: true) do |row|
  people << row.to_h
  student << person if person['field_of_study'] == 'student'
  teachers << person if person['field_of_study'] == 'teacher'
end

# group people by teachers/students and by department_name

people_grouped_by_field_of_study = people.group_by{|person| person['field_of_study']}

students = people_grouped_by_field_of_study['student'] # get only students
students = students.group_by{|student| student['department_name']} # group students by department_name

teachers = people_grouped_by_field_of_study['teacher'] # get only teachers
teachers = teachers.group_by{|teacher| teacher['department_name']} # group teachers by department_name


# push students and teachers based on department name
filepath = "#{__dir__}/../csv/department.csv"
CSV.foreach(filepath, headers: true) do |row|
  department = Department.new(
    row["name"],
    row["midterm_score_ratio"],
    row["final_score_ratio"],
    row["minimum_passing_score"],
    row["university_name"],
    students['name'], # students from department name
    teachers['name'] # teachers from department name
  )
  department.print_department_name
end

但我不确定学生和教师数组的格式。您需要将其转换为正确的格式。

【讨论】：