Ruby on rails 轨道块范围

我想计算此块中的条目数。由于ruby块变量作用域，我不处理此代码。有什么方法可以解决此问题吗

    arr_showcase.each do |entry|
          @entry = ContestEntry.find_by_id(entry)
          if @entry.view_in_showcase == true
            @entry.view_in_showcase = false
            @entry.save
            entry_added_showcase += 1 
          else
            @entry.view_in_showcase = true
            @entry.save
            entry_removed_showcase += 1 
          end
    end
    redirect_to :back, :notice => "#{entry_added_showcase} Desings added, #{entry_removed_showcase} Designs removed."

---

您在哪里声明了添加的

条目\u showcase

和删除的

条目\u showcase

？您必须在块外初始化它们

entry_added_showcase = entry_removed_showcase = 0
arr_showcase.each do |entry|
      @entry = ContestEntry.find_by_id(entry)
      if @entry.view_in_showcase == true
        @entry.view_in_showcase = false
        @entry.save
        entry_added_showcase += 1 
      else
        @entry.view_in_showcase = true
        @entry.save
        entry_removed_showcase += 1 
      end
end
redirect_to :back, :notice => "#{entry_added_showcase} Desings added, #{entry_removed_showcase} Designs removed."

---

您需要在块范围外定义变量，如下所示：

entry_added_showcase = 0
entry_removed_showcase = 0
arr_showcase.each do |entry|
      @entry = ContestEntry.find_by_id(entry)
      if @entry.view_in_showcase == true
        @entry.view_in_showcase = false
        @entry.save
        entry_added_showcase += 1 
      else
        @entry.view_in_showcase = true
        @entry.save
        entry_removed_showcase += 1 
      end
end
redirect_to :back, :notice => "#{entry_added_showcase} Desings added, #{entry_removed_showcase} Designs removed."

---

我想计算块中的条目数，并在块后使用它们