ruby-on-rails - Ruby On Rails - 无法通过报复在 has_many 中执行 where 语句

Question

所以我是 RoR 的新手，我似乎无法进行选择声明。这些是以下类:

模型:

class List < ActiveRecord::Base  
  has_many :list_categorization
  has_many :category, :through => :list_categorization
end

class ListCategorization < ActiveRecord::Base
  attr_accessible :category_id, :list_id

  belongs_to :category
  belongs_to :list
end

class Category < ActiveRecord::Base
  attr_accessible :name

  has_many :list_categorizations
  has_many :lists, :through => :list_categorizations
end

我要做的是选择一个具有给定类别的列表。我尝试使用以下代码在 list_controler 中做一个简化版本:

class ListsController < ApplicationController

    @lists = List.where("category.id = ?", 2)
  end
end

并具有以下 View :

<ul class="lists">
  <%= render @lists%>
</ul>

然后出现如下错误:

ActiveRecord::StatementInvalid in Lists#index_where

SQLite3::SQLException: no such column: category.id: SELECT "lists".* FROM "lists" WHERE (category.id = 2) ORDER BY lists.created_at DESC

我做错了什么？谢谢并致以最诚挚的问候。

Answer 1

@lists = Category.find(2).lists