ruby-on-rails - 如何使用 link_to 从 Controller 调用方法？

Question

我希望我的应用在 current_user 单击链接时向他添加一本书。我的代码似乎没问题，没有错误，但在用户点击链接后没有任何反应。

书.rb:

has_many :book_users
has_many :users, through: :book_users

用户.rb:

has_many :book_users
has_many :books, through: :book_users

book_user.rb:

belongs_to :book
belongs_to :user

books_controller.rb:

before_action :is_admin?, except: [:book_params, :add_to_books_i_read, :index]
before_filter :authenticate_user!
expose(:book, attributes: :book_params)
expose(:books)


  def create
    if book.save
      redirect_to(book)
    else
      render :new
    end
  end

  def update
    if book.save
      redirect_to(book)
    else
      render :edit
    end
  end

  def add_to_books_i_read(book_id)
    current_user.books << Book.find(book_id)
  end

在我的索引 View 中我有

ul
  -books.each do |book|
    li
      = link_to "#{book.name}", book_path(book)
      = link_to "  Add to my books", {:controller => "books", method: :add_to_books_i_read, book_id: :book.id}

那么，我做错了什么？为什么我的方法 add_to_books_i_read 什么都不做？单击此 link_to 后，数据库 book_users 中的表不会记录任何内容，但它本身运行良好(我通过控制台检查过)。我能做些什么？如何让用户通过该方法添加图书以及如何正确调用该方法？我们将不胜感激，谢谢!

Answer 1

  = link_to "  Add to my books", {:controller => "books", action: :add_to_books_i_read, book_id: :book.id}