HABTM 연결을 사용하여 레코드 추가

Question

나는 여전히 레일에 루비가있어 정말 차단되어 있습니다. 데이터베이스에 연결된 책과 작성자를 추가하려고하는데 두 테이블에 레코드가 추가되지만 tne에는 삽입되지 않습니다. 이건 내 코드입니다 :

books_controller.rb

class BooksController < ApplicationController 

    def index 
    @books= Book.all 
    end 

    def new 
    @book= Book.new 
    end 

    def create 
    @book= Book.new(book_params) 
    if @book.save 
    redirect_to books_path 
    else 
    redirect_to root_url 
    end 

    end 


    private 
    def book_params 
    params.require(:book).permit(:title, {:author_ids =>[]}) 
    end 
    end 

book.rb

class Book < ActiveRecord::Base 
    has_and_belongs_to_many :authors 
    before_destroy { authors.clear } 
end 

author.rb

class Author < ActiveRecord::Base 
    has_and_belongs_to_many :books 
end 

책/new.html.erb

<h1>Add new book</h1> 
<%= form_for @book do |f| %> 
    <%= f.label :title %> 
    <%=f.text_field :title %> 
     <% for author in Author.all %> 
     <%= check_box_tag 'book(author_ids[])',author.id, @book.authors.include?(author) %> 
     <%= author.f_name %> 
     <% end%> 
    <%= f.submit %> 
    <%end%> 

Answer 1

<%= check_box_tag 'book(author_ids[])',author.id, @book.authors.include?(author) %>을 <%= check_box_tag 'book[author_ids][]',author.id, @book.authors.include?(author) %>