Question

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

book.rb：

has_many :book_users
has_many :users, through: :book_users

user.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

在我的索引视图中，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？数据库book_users中的表在单击此link_to后没有记录任何内容，但它本身运行良好（我通过控制台检查）。我能做什么？如何让用户通过该方法添加书籍以及如何正确调用此方法？感谢您的每一个帮助，谢谢！

Answer 1

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

Answer 2

link_to中的第一个method是symbol of HTTP verb，因此您无法在控制器中传递您的功能要在您的控制器上定义和使用新操作，您需要为see here

定义路由

Answer 3

由于add_to_books_i_read是一个控制器操作方法，因此您应该更新路由以包含books资源的此操作，以便与Rails以一种资源丰富的方式完成事务的方式很好地协作。您还可以使用此路径的URL帮助程序，如下所示：

/books/:id/add_to_books_i_read

您的代码可能如下所示：

# config/routes.rb
resources :books do
  get :add_to_books_i_read, on: :member
end

# app/controller/books_controller.rb
def add_to_books_i_read
  current_user.books << Book.find(params[:id])
  # redirect or other logic
end

# app/views/books/index.html.haml
ul
  - books.each do |book|
    li
      = link_to "#{book.name}", book_path(book)
      = link_to "Add to my books", add_to_books_i_read_book_path(book)

Answer 4

还尝试将您的路线组织为（注意会员部分）

resources :books do 
  member do
    get :add_to_books_i_read
  end
end

并查看rake路由输出中的Prefix Verb列。

Answer 5

来自@Ioannis Tziligkakis，我编辑了一下。

尝试：

# config/routes.rb
resources :books do
  member do
    get :add_to_books_i_read
  end
end

# app/controller/books_controller.rb
def add_to_books_i_read
  current_user.books << Book.find(params[:id])
  # redirect or other logic
end

# app/views/books/index.html.haml
ul
  - books.each do |book|
    li
      = link_to "#{book.name}", book_path(book)
      = link_to "Add to my books", add_to_books_i_read_book_path(book.id)

Answer 6

试试这个：

# config/routes.rb
resources :books do
  # just not about method:
  # use get for request, search
  # use put for update
  # use post for create
  # use delete for destroy
  put :add_to_books_i_read, on: :member
end

# app/controller/books_controller.rb
def add_to_books_i_read
  @book = Book.find(params[:id])
  current_user.books << @book
  respond_to do |format|
    format.js
  end
end

# app/views/books/index.html.haml
ul
  - books.each do |book|
    li{:id => "book_#{book.id}"}
      = render "links", book: book

# add field: app/views/books/_links.html.haml
= link_to "#{book.name}", book_path(book)
= link_to "Add to my books", add_to_books_i_read_book_path(book), method: :put, remote: true

# add field: app/views/books/add_to_books_i_read.js.erb
$("#book_<%= @book.id %>").html("<%= j render 'books/links', book: @book %>")

Answer 7

天啊。有了你的建议帮助，我终于明白了！所以，

控制器：

def add_to_books_i_read
    current_user.books << Book.find(params[:id])
    redirect_to(:back) #this line
end

路线

resources :books do
    member do
      get :add_to_books_i_read
    end
end

索引视图

-books.each do |book|
    li
      = link_to "#{book.name}", book_path(book)
      = link_to  "       Add to my books", add_to_books_i_read_book_path(book)

谢谢大家的帮助！我真的很感激！：）

如何使用link_to从控制器调用方法？

7 个答案: