每当我尝试使用提交按钮将表单中的数据保存到数据库中时，我都会遇到此错误，有人能解释一下为什么会发生这种情况，原因是什么吗？我是RoR的新手，还在学习：“）

undefined method `type' for #<Order id: nil, paper_size: "A4", color: "Black & White", quantity: 16, paper_style: "Black to Back", description: "asdasdasdasd", created_at: nil, updated_at: nil, first_name: "test", last_name: "example", phone_number: 123456789, email: "example@test.com">

订单控制器.rb

class OrdersController < ApplicationController

    # GET to /orders/new
    def new
        @order = Order.new
    end

    # POST to /orders
    def create
        @order = Order.create(order_params)
        if @order.save
            redirect_to root_path
            
        else
            redirect_to about_path
        end
    end

    private
        def order_params
            params.require(:order).permit(:first_name, :last_name, :phone_number, :email, :paper_size, :color, :paper_style, :quantity, :description, files: [] )
        end
end

查看/订单/新.html.erb

<div class="container">
    <h1 class="text-center">Order From Home!</h1>
    <div class="row">
        <div class="col-md-4 col-md-offset-4">

            <%= form_for @order do |f| %>          
                <%= f.label :first_name%>
                <%= f.text_field :first_name, class:"form-control" %><br/>

                <%= f.label :last_name %>
                <%= f.text_field :last_name, class:"form-control" %><br/>
            

                <%= f.label :phone_number %>
                <%= f.text_field :phone_number, class:"form-control" %><br/>

            
                <%= f.label :email %>
                <%= f.text_field :email, class:"form-control" %><br/>

                <%= f.label :files %>
                <%= f.file_field :files, multiple: true %><br/>
            

                <%= f.label :paper_size %>
                <%= f.select :paper_size, ['A4', 'B4'], { prompt: 'Select' }, class:'form-select' %><br/>

                <%= f.label :color %>
                <%= f.select :color, ['Black & White', 'Color'], { prompt: 'Select' }, class:'form-select' %><br/>

                <%= f.label :paper_style %>
                <%= f.select :paper_style, ['Black to Back', 'Side to Side'], { prompt: 'Select' }, class:'form-select' %><br/>

                <%= f.label :quantity %>
                <%= f.select :quantity, options_for_select(0..500), { prompt: "Select" }, class:'form-select' %><br/>

                <%= f.label :description %>
                <%= f.text_area :description, class:"form-control" %><br/>

                <div class="btn-order">
                    <%= f.submit %>
                </div>
            <% end %>
            
        </div>     
    </div>
</div>

schema.rb（订单表）

create_table "orders", force: :cascade do |t|
    t.string "paper_size"
    t.string "color"
    t.integer "quantity"
    t.string "paper_style"
    t.text "description"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.string "first_name"
    t.string "last_name"
    t.integer "phone_number"
    t.string "email"
  end

为什么会发生这种情况？@order.create和@ www.example.com之间有什么区别order.new??

UPDATEmy order.rb（model）对:type进行了验证，我听人说，在Rails中创建表时，应该避免使用type和date

class Order < ApplicationRecord
    
    belongs_to :admin

    validates :paper_size, presence: true
    validates :color, presence: true
    validates :quantity, presence: true
    validates :type, presence: true
    validates :first_name, presence: true
    validates :last_name, presence: true
    validates :phone_number, presence: true
    validates :email, presence: true

   

    has_many_attached :files
end

我通过迁移更改了db表中的列名，并将模型文件中的新列名替换为

class Order < ApplicationRecord
    
    belongs_to :admin

    validates :paper_size, presence: true
    validates :color, presence: true
    validates :quantity, presence: true
    validates :paper_style, presence: true
    validates :first_name, presence: true
    validates :last_name, presence: true
    validates :phone_number, presence: true
    validates :email, presence: true

   

    has_many_attached :files
end