我找不到属性:description
返回nil
的错误。 从rails console
:为什么属性:描述返回零
@book = Book.first
# Book Load (0.7ms) SELECT "books".* FROM "books" ORDER BY "books"."id" ASC LIMIT 1
#=> #<Book id: 1, title: "A Game of Thrones", description: nil, author: "George R. R. Martin ", created_at: "2016-09-01 13:27:09", updated_at: "2016-09-01 13:27:09">
books_controller.rb
class BooksController < ApplicationController
before_action :find_book, only: [:show, :edit, :update, :destroy]
def index
@books = Book.all.order("created_at DESC")
end
def show
@book = Book.find(params[:id])
end
def new
@book = Book.new
end
def create
@book = Book.new(book_params)
if @book.save
redirect_to root_path
else
render 'new'
end
end
private
def book_params
params.require(:book).permit(:description, :title, :author)
end
def find_book
@book = Book.find(params[:id])
end
end
_form.html.erb
<%= f.input :title, label: "Book Title" %>
<%= f.input :description %>
<%= f.input :author %>
<%= f.button :submit %>
'show.html.erb'
<h2><%= @book.title %></h2>
<h3><%= @book.author %></h3>
<h2><%= @book.description %></h2>
routs.rb
'Rails.application.routes.draw做 资源:书籍 根 '的书#指数' 结束'
我想你已经试图通过你的'BooksController'从表单创建一本书。你可以显示已经传递给你的控制器的参数吗?您可以在应用程序的日志文件中找到它们。 – Stefan
尝试创建新记录,甚至可以看到没有描述。 from Console –
您正在使用哪个版本的Rails?你有没有在Gemfile中声明的“protected_attributes”gem?你的'Book'模型中有“attr_accessible”吗? – romainsalles