ruby-on-rails - 如何从 2 个多对多关系中查找记录

Question

我想在某个庄园内找到某个类别的企业

我有以下型号

Business has many Categories through Categorizations
Category has many Businesses through Categorizations

Business has many Estates through Localizations
Estate has many Businesses through Localizations

在类别显示操作中，我有

def show
  @category = Category.find(params[:id])
  @estate = Estate.find(current_user.estate_id)
  @businesses = @estate.businesses
end

明显的问题是，无论它属于哪个类别，它都会退回所有企业的遗产。我试图添加一个 .where("category_id = ?", @category_id) 但我得到 column does not exist 错误

Answer 1

由于它似乎有效，这里再次提出建议作为答案:)

@businesses = @estate.businesses.joins(:categories).where(categories: {id: @category.id})