Editing Products

The process of editing records is very similar to creating records. Instead of new and create actions, we will have edit and update.

Let’s implement them in the controller with the following:

class ProductsController < ApplicationController
  def index
    @products = Product.all
  end


  def show
    @product = Product.find(params[:id])
  end


  def new
    @product = Product.new
  end


  def create
    @product = Product.new(product_params)
    if @product.save
      redirect_to @product
    else
      render :new, status: :unprocessable_entity
    end
  end


  def edit
    @product = Product.find(params[:id])
  end


  def update
    @product = Product.find(params[:id])
    if @product.update(product_params)
      redirect_to @product
    else
      render :edit, status: :unprocessable_entity
    end
  end


  private
    def product_params
      params.expect(product: [ :name ])
    end
end

Next we can add an Edit link to :

<h1><%= @product.name %></h1>


<%= link_to "Back", products_path %>
<%= link_to "Edit", edit_product_path(@product) %>
Strong Parameters
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