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努力獲得了創建下列控制器我嵌套的路線工作:不能使用嵌套的路線創建
class BooksController < ApplicationController
before_action :set_book, only: [:show, :edit, :update, :destroy]
before_filter :load_author
# GET /books
# GET /books.json
def index
@books = @author.books.all
end
# GET /books/1
# GET /books/1.json
def show
end
# GET /books/new
def new
@book = @author.books.new
end
# GET /books/1/edit
def edit
end
# POST /books
# POST /books.json
def create
@book = @auhtor.books.new(book_params)
respond_to do |format|
if @book.save
format.html { redirect_to [@parent, @child], notice: 'Book was successfully created.' }
format.json { render :show, status: :created, location: @book }
else
format.html { render :new }
format.json { render json: @book.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /books/1
# PATCH/PUT /books/1.json
def update
respond_to do |format|
if @book.update(book_params)
format.html { redirect_to @book, notice: 'Book was successfully updated.' }
format.json { render :show, status: :ok, location: @book }
else
format.html { render :edit }
format.json { render json: @book.errors, status: :unprocessable_entity }
end
end
end
# DELETE /books/1
# DELETE /books/1.json
def destroy
@book.destroy
respond_to do |format|
format.html { redirect_to books_url, notice: 'Book was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_book
@book = Book.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def book_params
params.require(:book).permit(:name, :author_id)
end
def load_author
@author = Author.find(params[:author_id])
end
end
我正在上線#29以下錯誤:
undefined method `books' for nil:NilClass
任何想法?它正確地填充創建視圖中的author_id字段,但是當我單擊保存時出現此錯誤。
錯誤在創建方法的第一行? – vee 2014-09-02 19:36:05