Ruby on rails RoR标准MVC CRUD操作中未将表单字段保存到数据库

我使用的是Rails 4.1.0

我的看法是：

<%= form_for @book do |f| %>

    <%= f.text_field :title %>
    <%= f.text_field :author %>
    <%= f.number_field :pages %>
    <%= f.text_field :description %>
    <%= f.submit "Add book" %>
<% end %>

---

我错过了什么？提前谢谢

我认为您在这里混淆了两个重叠的概念：

只允许某些参数创建DB记录的旧（ish）方法是将它们列为白名单，我认为这是您使用

attr\u访问器

尝试的方法，但正确的方法是

attr\u accessible

控制哪些参数可以创建DB记录的新方法是使用private

book\u params

方法实现的模式。但是，如果您正在执行强参数位，则不需要执行白名单

---

因此，如果您只需将

attr\u访问器

位一起取出，就可以了。

谢谢，这确实是个问题！

class BooksController < ApplicationController
  def new
    @book = Book.new
  end
  def create
    @book = Book.new(book_params)
    if @book.save
        redirect_to '/', notice: "You have succesfully added a book"
    else
        flash.now[:error] = "Something went wrong"
        render :new
    end
  end

  private
  def book_params
    params.require(:book).permit(:title, :author, :pages, :description)
  end
end

class Book < ActiveRecord::Base

    validates :title, presence: true
    validates :title, uniqueness: true

    attr_accessor :title, :author, :pages, :description
end

Started POST "/books" for 10.0.2.2 at 2014-05-05 22:59:08 +0000
Processing by BooksController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"SDB/oB/CjZsBHmI0zLPmQnKpZSxO7piGnsLSzEy2hyA=", "book"=>{"title"=>"tittel", "author"=>"te", "pages"=>"", "description"=>""}, "commit"=>"Add book"}
  [1m[36m (0.2ms)[0m  [1mbegin transaction[0m
  [1m[35mBook Exists (3.9ms)[0m  SELECT  1 AS one FROM "books"  WHERE "books"."title" = 'tittel' LIMIT 1
  [1m[36mSQL (5.0ms)[0m  [1mINSERT INTO "books" ("created_at", "updated_at") VALUES (?, ?)[0m  [["created_at", "2014-05-05 22:59:08.989197"], ["updated_at", "2014-05-05 22:59:08.989197"]]
  [1m[35m (5.9ms)[0m  commit transaction
Redirected to http://localhost:3003/
Completed 302 Found in 26ms (ActiveRecord: 15.0ms)