ruby-on-rails - 在 Ruby on Rails 中重构 group_by 的切换 block 语句

Question

如何重写这段代码，使其完全动态，并且不必使用 case 子句手动列出 @group 的所有可能值？

# Grouping
@group = params[:group] if !params[:group].blank?
case @group
  when 'category_id'
    @ideas_grouped = @ideas.group_by { |i| i.category_id }
  when 'status_id'
    @ideas_grouped = @ideas.group_by { |i| i.status_id }
  when 'personal_bias'
    @ideas_grouped = @ideas.group_by { |i| i.personal_bias }
  when 'business_value'
    @ideas_grouped = @ideas.group_by { |i| i.business_value }
end

Answer 1

您可以使用某种元编程 上面的代码可以用其中一种方式重构

if params[:group].present? && ["category_id","status_id","personal_bias","business_value"].include?(params[:group])
    @ideas_grouped = @ideas.group_by { |i| i.send(params[:group]) }
end