执行rake db:migrate触发NameError: uninitialized constant Products错误求助

我是Ruby on Rails（RoR）新手，正在搭建CRUD应用，执行rake db:migrate命令时终端反复报错：

NameError: uninitialized constant Products
mount Products::ProductsAPI => '/api/products'

我已经参考过相关建议，除Model文件product.rb（路径：\crud\app\models\product.rb）使用单数Product外，其他类和模块均命名为Products。完全复制教程代码，还执行了gem update --system更新gem（怀疑是Grape gem导致问题），但问题依旧。

我尝试过以下操作，均无效：

• 修改迁移文件名和类名使其匹配
• 调整路由文件中路由位置
• 核对并更新代码与教程完全一致
• 以管理员身份运行终端
• 在路由文件中替换为完整文件夹路径
• 更新gem并执行bundle install

以下是相关文件代码：

Products Controller #

class ProductsController < ApplicationController   
   
# GET method to get all products from database   
def index   
  @products = Product.all   
end   
 
# GET method to get a product by id   
def show   
  @product = Product.find(params[:id])   
end   
 
# GET method for the new product form   
def new   
  @product = Product.new   
end   
 
# POST method for processing form data   
def create   
  @product = Product.new(product_params)   
  if @product.save   
    flash[:notice] = 'Product added!'   
    redirect_to root_path   
  else   
    flash[:error] = 'Failed to edit product!'   
    render :new   
  end   
end   
 
 # GET method for editing a product based on id   
def edit   
  @product = Product.find(params[:id])   
end   
 
# PUT method for updating in database a product based on id   
def update   
  @product = Product.find(params[:id])   
  if @product.update_attributes(product_params)   
    flash[:notice] = 'Product updated!'   
    redirect_to root_path   
  else   
    flash[:error] = 'Failed to edit product!'   
    render :edit   
  end   
end   
 
# DELETE method for deleting a product from database based on id   
def destroy   
  @product = Product.find(params[:id])   
  if @product.delete   
    flash[:notice] = 'Product deleted!'   
    redirect_to root_path   
  else   
    flash[:error] = 'Failed to delete this product!'   
    render :destroy   
  end   
end   
 
# we used strong parameters for the validation of params   
def product_params   
  params.require(:product).permit(:name, :price, :old_price, :short_description, :full_description)   
end   
 
end  

Product Model #

class Product < ApplicationRecord   
    validates :name, presence: true
    validates :price, presence: true, numericality: {:greater_than => 0}
    validates :short_description, presence: true   
end  

数据库迁移文件 #

class CreateProducts < ActiveRecord::Migration[7.0]
  def change
    create_table :products do |t|
      t.string :name
      t.decimal :price
      t.text :short_description
      t.text :full_description
      t.timestamps
    end
  end
end

路由文件 #

Rails.application.routes.draw do
  get 'products/index'
  get 'products/show'
  get 'products/new'
  get 'products/create'
  get 'products/edit'
  get 'products/update'
  get 'products/destroy'
 
   
  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
  resources :products  
  root 'products#index'  
   
  # Defines the root path route ("/")
mount Products::ProductsAPI => '/api/products'
  
  # root "articles#index"
end

内容的提问来源于stack exchange，提问作者Kerrr