路由错误，没有路由匹配[GET]“/ categorys / new”

Question

The name of the table is "category", controller is "categories". I have added resources :categories in routes file.

Why is it showing "Routing Error/ No route matches [GET] /categorys/new" ? The following is the code in controller:

class CategoriesController < ApplicationController
  def new
    @category = Category.new
  end

  def create
    @category = category.build(category_params)

    if @category.save
      redirect_to root_path
    else
      render 'new'
    end
  end

  private

  def category_params
    params.require(:category).permit(:name)
  end
end

Answer 1

The route you've defined is named categories , but the URL in the error is categorys -- that shouldn't have come from a URL helper, but maybe you built the URL manually? Either way, it doesn't match.

Answer 2

It's because resources :categories would produce GET /categories/new endpoint (along with others), but not GET /categorys/new . See Rails routing guide for more info.