Ruby on rails 当某些列发生更改时，如何循环？

视图：

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你只需要稍微改变一下你的结构-

首先，将

@foods

定义为

Food.group_by{f | f.Food_category.name}

（假设FoodCategory有一个类似name的属性，但将其更改为您使用的任何属性）

然后像这样循环你的食物：

Appetizer <- I want to add this headline when category_id changes
food name  price 
aaaa        $3
bbbb        $2
cccc        $1

Pasta <- I want to add this headline when category_id changes
food name  price 
aaaa        $3
bbbb        $2
cccc        $1

Appetizer <- I want to add this headline when category_id changes
food name  price 
aaaa        $3
bbbb        $2
cccc        $1

Pasta <- I want to add this headline when category_id changes
food name  price 
aaaa        $3
bbbb        $2
cccc        $1

@foods.each do |category, foods|
  #...your code here
  # remember that `foods` is an Array so you'll loop through that separately
  # foods.each do |food|
  #   ...display food name and price
  # end
end