làm CRUD trong 1 file index

index.html.haml

= form_for [:admins,@admins_product] do |f|
  - if @admins_product.errors.any?
    #error_explanation
      %h2= "#{pluralize(@admins_product.errors.count, "error")} prohibited this admins_product from being saved:"
      %ul
        - @admins_product.errors.full_messages.each do |msg|
          %li= msg

  .field
    = f.label :name
    = f.text_field :name
  .field
    = f.label :price
    = f.text_field :price
  .field
    = f.label :image
    = f.file_field :image
  .field
    = f.label :status
    = f.check_box :status
  .field
    = f.label :viewed
    = f.number_field :viewed
  .actions
    = f.submit 'Save'
-# #comments_content= render 'form'
%h1 Listing admins_products

%table
  %thead
    %tr
      %th Name
      %th Price
      %th Image
      %th Status
      %th Viewed
      %th
      %th
      %th

  %tbody
    - @admins_products.each do |admins_product|
      %tr.product
        %td= admins_product.name
        %td= admins_product.price
        %td= image_tag admins_product.image_url(:thumb).to_s if admins_product.image?
        %td= admins_product.status
        %td= admins_product.viewed
        %td= link_to 'Show', [ :admins ,admins_product]
        %td= link_to 'Edit', edit_admins_product_path(admins_product)
        %td= link_to 'Destroy', [:admins,admins_product], :method => :delete, :data => { :confirm => 'Are you sure?' }

%br

= link_to 'New Product', new_admins_product_path

product.coffee

class window.Product
  constructor: ->
    # alert ("you are working on coffeescript")
    @clickonrow()


  clickonrow: ->
    $(document).on "click",'tr', '.product',(e) ->
      id_value = $("#id").val()
      name_value = $("#name").val()
      price_value = $("#price").val()
      image_value = $("#image").val()
      status_value = $("#status").val()
      viewed_value = $("#viewed").val()
      $.ajax
        type : "GET"
        url: "products"
        dataType: "JSON"
        data: {
          product: {
            id: id_value,
            name: name_value,
            price: price_value,
            image: image_value,
            status: status_value,
            viewed: viewed_value
          }
        }
        success: (data) ->
          alert data["id"]
          return false
          # $('input[name]="name_value"').val(data[name]);
          # $('input[price]="price_value"').val(data[price]);
          # $("#comments_content").html data
        error: (data) ->
          # return false

product_controller.rb

class Admins::ProductsController < ApplicationController
   before_action :set_admins_product, only: [:show, :edit, :update, :destroy]
   # before_action :set_admins_product, only: [:index]
  # GET /admins/products
  # GET /admins/products.json
  def index
    @admins_product = Product.new
    @admins_products = Product.all
    respond_to do |format|
      format.html {  }
      # format.json { render json: @admins_products}
      # format.js
      format.json do
        id = params[:id]
      end
    end
  end

  # GET /admins/products/1
  # GET /admins/products/1.json
  def show
    @product = Product.find(params[:id])
    respond_to do |format|
      format.json {render json: @product}
    end
  end

  # GET /admins/products/new
  def new
    @admins_product = Product.new
  end

  # GET /admins/products/1/edit
  def edit
  end

  # POST /admins/products
  # POST /admins/products.json
  def create
    @admins_product = Product.new(admins_product_params)

    respond_to do |format|
      if @admins_product.save
        format.html { redirect_to admins_products_path, notice: 'Product was successfully created.' }
        format.json { render :index, status: :created, location: @admins_product }
      else
        format.html { render :new }
        format.json { render json: @admins_product.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /admins/products/1
  # PATCH/PUT /admins/products/1.json
  def update
    respond_to do |format|
      if @admins_product.update(admins_product_params)
        format.html { redirect_to admins_products_path, notice: 'Product was successfully updated.' }
        format.json { render :index, status: :ok, location: @admins_product }
      else
        format.html { render :edit }
        format.json { render json: @admins_product.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /admins/products/1
  # DELETE /admins/products/1.json
  def destroy
    @admins_product.destroy
    respond_to do |format|
      format.html { redirect_to admins_products_url, notice: 'Product was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_admins_product
      @admins_product = Product.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def admins_product_params
      params.require(:product).permit(:name, :price, :image, :status, :viewed)
    end
end

products.json

[{"id":1,"name":"12","price":"1.0","image":{"image":{"url":"/uploads/product/image/1/hinh-nen-em-be-de-thuong-nhat-1.jpg","large":{"url":"/uploads/product/image/1/large_hinh-nen-em-be-de-thuong-nhat-1.jpg"},"thumb":{"url":"/uploads/product/image/1/thumb_hinh-nen-em-be-de-thuong-nhat-1.jpg"}}},"status":true,"viewed":1,"url":"http://localhost:3000/admins/products/1.json"}]