Ruby on rails Rails-通过多个数组进行迭代

我正在寻找一种更简单的方法来迭代一些代码。我有一个

用户

模型，我想在

ReportRecord

模型（用于报告）中统计某些

用户

我有一个要记录的

用户名的定义值列表（即“Jan”、“Lisa”、“Tina”）。当列表比三个值长得多时，如何使此代码更加枯燥

@users = User.all
@users.each do |u|

  # this part repeats with different names
  quantity = u.where("name = ?", "Jan").count
  ReportRecord.create(:user_id => u.id, :name => "Jan", :quantity => quantity)

  # repeated code with different name
  quantity = u.where("name = ?", "Lisa").count
  ReportRecord.create(:user_id => u.id, :name => "Lisa", :quantity => quantity)

  # repeated code with different name
  quantity = u.where("name = ?", "Tina").count
  ReportRecord.create(:user_id => u.id, :name => "Tina", :quantity => quantity)

end

我将首先对所有用户求和（1个查询而不是3个查询）：

我将首先对所有用户求和（1个查询而不是3个查询）：

names = %w(Jan List Tina)

names.each do |name|
  count = User.where(name: name).count
  ReportRecord.create(name: name, quantity: count) # I don't understand `u.id`
end

quantity_by_name = User.select(:name).where(name: %w(Jan List Tina))
                       .group(:name).sum(:quantity)
#=> { 'Lisa' => 1, 'Jan' => 2, 'Tina' => 3 }
quantity_by_name.each do |name, quantity|
  ReportRecord.create(name: name, quantity: quantity)
end