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页面在Ruby Rails上加载不必要的查询

ruby-on-rails-5.1 haml terminal ruby ruby-on-rails
  •  1
  • Anton S.  · 技术社区  · 6 年前

    我有一个奇怪的问题,我的网站的每一页,包含数据库查询加载一些额外的项目。我以前从未遇到过这个问题,尝试检查所有控制器,但没有发现任何问题。下面是加载(或刷新)时的输出示例 

    => Booting Puma
=> Rails 5.1.6 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.12.0 (ruby 2.5.0-p0), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
Started GET "/c/wines" for 127.0.0.1 at 2018-11-02 15:55:30 -0400 (0.3ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
Processing by CatalogsController#show as HTML
Parameters: {"id"=>"wines"}
Catalog Load (0.2ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."slug" = ? LIMIT ?  [["slug", "wines"], ["LIMIT", 1]]
Rendering catalogs/show.html.haml within layouts/application (0.2ms) SELECT COUNT(*) FROM "categories" WHERE "categories"."catalog_id" = ? [["catalog_id", 1]] (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1


Category Exists (0.3ms)  SELECT  1 AS one FROM "categories" WHERE "categories"."catalog_id" = 1 AND "categories"."open" = ? LIMIT ?  [["open", "t"], ["LIMIT", 1]]
  Category Load (0.9ms)  SELECT "categories".* FROM "categories" WHERE "categories"."catalog_id" = 1 AND "categories"."open" = ?  [["open", "t"]]
  CACHE Category Load (0.0ms)  SELECT "categories".* FROM "categories" WHERE "categories"."catalog_id" = 1 AND "categories"."open" = ?  [["open", "t"]]
  CACHE Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."catalog_id" = 1 AND "categories"."open" = ?  [["open", "t"]]
  Product Load (0.8ms)  SELECT "products".* FROM "products" WHERE "products"."catalog_id" = 1 AND "products"."open" = ? AND "products"."category_id" = 1  [["open", "t"]]
  Catalog Load (0.7ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Product Load (0.3ms)  SELECT "products".* FROM "products" WHERE "products"."catalog_id" = 1 AND "products"."open" = ? AND "products"."category_id" = 2  [["open", "t"]]
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Rendered catalogs/show.html.haml within layouts/application (142.7ms)
  Rendered application/_favicon.html.haml (11.1ms)
  Catalog Load (0.4ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (23.7ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (15.7ms)
Completed 200 OK in 937ms (Views: 890.8ms | ActiveRecord: 9.4ms)


Started GET "/uploads/catalog/photo/1/hero-8.png" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Processing by StaticController#home as HTML
Started GET "/uploads/product/photo/4/pc_pistachio.png" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/uploads/product/photo/7/pc_pistachio.png" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/uploads/product/photo/1/pc_creame.png" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/uploads/product/photo/10/pc_pistachio.png" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
  Rendering static/home.html.haml within layouts/application
  Catalog Load (0.3ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
   (0.3ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.4ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.9ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Product Exists (0.2ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.1ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Rendered static/home.html.haml within layouts/application (95.0ms)
  Rendered application/_favicon.html.haml (15.0ms)
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (19.9ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (18.0ms)
Completed 200 OK in 400ms (Views: 389.1ms | ActiveRecord: 4.3ms)


Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Processing by StaticController#home as HTML
Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:31 -0400
Processing by StaticController#home as HTML
  Rendering static/home.html.haml within layouts/application
Processing by StaticController#home as HTML
  Catalog Load (0.5ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
  Rendering static/home.html.haml within layouts/application
Processing by StaticController#home as HTML
  Catalog Load (0.4ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
  Rendering static/home.html.haml within layouts/application
   (0.3ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.2ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
   (0.1ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.2ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Rendering static/home.html.haml within layouts/application
   (0.4ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Catalog Load (0.2ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
   (0.1ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.2ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Category Load (0.3ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
  Product Load (0.4ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Product Exists (0.4ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Product Exists (0.4ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Product Load (0.4ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.3ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Catalog Load (0.4ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Product Load (0.6ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.1ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Rendered static/home.html.haml within layouts/application (206.4ms)
  Rendered application/_favicon.html.haml (6.5ms)
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.1ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Rendered static/home.html.haml within layouts/application (195.5ms)
  Rendered application/_favicon.html.haml (0.1ms)
  Rendered static/home.html.haml within layouts/application (246.3ms)
  Rendered static/home.html.haml within layouts/application (255.3ms)
  Rendered application/_favicon.html.haml (0.1ms)
  Rendered application/_favicon.html.haml (0.0ms)
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (13.9ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (9.7ms)
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (3.2ms)
  Catalog Load (0.3ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (3.2ms)
  Rendered shared/_navbar.html.haml (14.3ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (5.9ms)
  Rendered shared/_footer.html.haml (3.0ms)
  Rendered shared/_footer.html.haml (6.0ms)
Completed 200 OK in 859ms (Views: 853.1ms | ActiveRecord: 3.5ms)


Completed 200 OK in 802ms (Views: 795.7ms | ActiveRecord: 4.0ms)


Completed 200 OK in 849ms (Views: 842.5ms | ActiveRecord: 3.7ms)


Started GET "/" for 127.0.0.1 at 2018-11-02 15:55:32 -0400
Processing by StaticController#home as HTML
Completed 200 OK in 858ms (Views: 851.2ms | ActiveRecord: 3.8ms)


  Rendering static/home.html.haml within layouts/application
  Catalog Load (0.2ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.3ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.6ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.4ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
   (0.5ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Product Exists (0.2ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.4ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.3ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Category Load (0.5ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Rendered static/home.html.haml within layouts/application (58.7ms)
  Rendered application/_favicon.html.haml (9.7ms)
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (16.9ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (11.7ms)
Completed 200 OK in 261ms (Views: 254.4ms | ActiveRecord: 4.7ms)


    class StaticController < ApplicationController
  def home
    @catalogs = Catalog.all.where(open: true).order('created_at ASC').limit(6)
    # @products = Product.all.includes(:catalog, :category).where(open: true).order('created_at DESC').take(8)
  end

  def about
    @catalogs = Catalog.all.where(open: true)
    @categories = Category.all.where(open: true)
    @products = Product.all.where(open: true)
  end

  def download_pdf
    send_file "#{Rails.root}/app/assets/docs/1_s.pdf", type: "application/pdf", x_sendfile: true
  end
end

    一开始我以为这是一个包,因为我没有添加任何新代码。如果您需要控制器的更多代码,请告诉我。非常感谢您的时间和帮助。

    应用程序控制器: 

    class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  before_action :prepare_meta_tags, if: "request.get?"

  def prepare_meta_tags(options={})
    site_name   = "Alvian Imports Inc."
    title       = "Alvain Imports Inc."
    description = "For many years, Alvian imports alcohol accross Florida state and now it's time to grow. Absolutly new team with new products that will be loved by everyone. We have an exclusive partnership with Ponche Caribe and we are starting to deliver our products to Texas, California, Mexico, and Columbia. Our goal is to make alcohol importation better and faster, so our team is working hard to deliver wonderful products to your closest stores."
    image       = options[:image] || "app/assets/images/brand/logo.png"
    current_url = request.url

    # Let's prepare a nice set of defaults
    defaults = {
      site:        site_name,
      title:       title,
      image:       image,
      description: description,
      keywords:    %w[food food processor food service food and drink f&b food industry food and beverage service food & beverage food processing industry food and beverage manager food and beverage industry food service jobs food beverage beverage industry food service companies f&b service food service worker food industry jobs food service industry food & drink food drink food and beverage management types of food service f&b industry food and beverage department import imports alvian alvianimports miami usa florida],
      twitter: {
        site_name: site_name,
        site: '@IncAlvian',
        card: 'The Beverage Company. Ponche Caribe Curacao Blue & Liquors Exclusive Distributor Florida - Texas - California - Colombia Distributor. Must be 21 +',
        description: description,
        image: image
      },
      og: {
        url: current_url,
        site_name: site_name,
        title: title,
        image: image,
        description: description,
        type: 'website'
      }
    }

    options.reverse_merge!(defaults)

    set_meta_tags options
  end
end

    Application.html.haml代码: 

    !!!
%html(lang="en-US" class="region--#{controller.controller_name}")
  %head
    = display_meta_tags
    %meta(http-equiv="X-UA-Compatible" content="IE=edge,chrome=1")
    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
    %meta{:content => "text/html; charset=UTF-8", "http-equiv" => "Content-Type"}/
    %meta{:charset => "utf-8"}/
    %meta{:content => "width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no", :name => "viewport"}/
    %meta{:content => "user-scalable=no, width=device-width, initial-scale=1.0", :name => "viewport"}/
    %meta{:content => "yes", :name => "apple-mobile-web-app-capable"}/
    %meta{:'http-equiv' => "X-UA-Compatible", :content => "IE=edge"}
    %meta{:name => "HandheldFriendly", :contnet => "true"}
    %meta{:name => "MobileOptimized", :content => "176"}
    = render 'application/favicon'
    %title #{content_for?(:title) ? yield(:title) : 'Alvian Imports'}
    = csrf_meta_tags
    = stylesheet_link_tag    'application', media: 'all'
    = analytics_init if GoogleAnalytics.valid_tracker?
  %body(class = '#{controller.controller_name}')
    %div(class="application-wrapper")
      = render partial: 'shared/navbar'
      = content_tag :main, class: "layout layout-#{controller.action_name}" do
        = yield
      = render partial: 'shared/footer'
    - unless params[:nojs]
      = javascript_include_tag 'application'

    更新2

    我有三个模型:目录,类别和产品。 

    class Catalog < ApplicationRecord
    extend FriendlyId
    friendly_id :name, use: [:slugged, :history]

    mount_uploader :photo, PhotoUploader
    has_many :categories, dependent: :delete_all
    has_many :products, :through => :categories, :source => :catalog, dependent: :delete_all

    # Important fields
    validates_presence_of :name
end

    类别模型: 

    class Category < ApplicationRecord
    extend FriendlyId
    friendly_id :name, use: [:slugged, :history]

    belongs_to :catalog, :foreign_key => 'catalog_id'
    has_many :products, dependent: :delete_all

    # Important fields
    validates_presence_of :name

    def self.active
      where(status: 1)
    end
end

    产品型号: 

    class Product < ApplicationRecord
    extend FriendlyId
    friendly_id :name, use: [:slugged, :history]

    mount_uploader :photo, PhotoUploader
    belongs_to :catalog, :foreign_key => 'catalog_id'
    belongs_to :category, :foreign_key => 'category_id'

    # Important fields
    validates_presence_of :name
end


    Started GET "/" for 127.0.0.1 at 2018-11-02 16:41:26 -0400
Processing by StaticController#home as HTML
  Rendering static/home.html.haml within layouts/application
  Catalog Load (0.2ms)  SELECT  "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ? ORDER BY created_at ASC LIMIT ?  [["open", "t"], ["LIMIT", 6]]
   (0.1ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  CACHE  (0.0ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 1
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 1 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 1
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" IN (1, 2)
   (0.2ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 2
  Product Exists (0.1ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.1ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 2 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.1ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 2
  Category Load (0.1ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 3
   (0.3ms)  SELECT COUNT(*) FROM "products" WHERE "products"."catalog_id" = 3
  Product Exists (0.3ms)  SELECT  1 AS one FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 1]]
  Product Load (0.2ms)  SELECT  "products".* FROM "products" WHERE "products"."catalog_id" = 3 LIMIT ?  [["LIMIT", 6]]
  Catalog Load (0.3ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."id" = 3
  Category Load (0.2ms)  SELECT "categories".* FROM "categories" WHERE "categories"."id" = 2
  Rendered static/home.html.haml within layouts/application (44.4ms)
  Rendered application/_favicon.html.haml (7.9ms)
  Catalog Load (0.2ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_navbar.html.haml (15.8ms)
  CACHE Catalog Load (0.0ms)  SELECT "catalogs".* FROM "catalogs" WHERE "catalogs"."open" = ?  [["open", "t"]]
  Rendered shared/_footer.html.haml (8.9ms)
Completed 200 OK in 218ms (Views: 213.2ms | ActiveRecord: 3.1ms)

    主页HTML(HAML),但是必须提到的是,我在其他需要查询的页面(例如目录显示页面)上遇到了类似的问题: 

    = content_for :navbar_class, "navbar-dark"

%section(class="hero hero-homepage")
  %div(class="hh-container")
    %div(class="hh-carousel")
      - @catalogs.each do |catalog|
        %div(class="hhc-item")
          = link_to catalog, class: 'hhc-container' do
            %div(class="hhc-background" style="background-image: url(#{catalog.photo});")
            -# = image_tag(catalog.photo, lazy: true, class: "hhc-background")
            %div(class="hhc-caption")
              %h4(class="heading heading-1 is-light") #{catalog.name}
              - if !catalog.description.empty? 
                %p(class="text text-2 is-light is-transparent") #{truncate(catalog.description, :length => 112)}

%section(class="section")
  - @catalogs.each do |pc|
    - @products = Product.all.where(catalog_id: pc)
    %div(class="content")
      %div(class="header header-hr")
        %span
          %h4(class="heading heading-4") New #{pc.name}
        - if @products.count > 6
          %span
            = link_to "View all " + @products.count.to_s, pc, class: "link link-secondary link-arrow"
      %div(class="row")
        - if !@products.empty?
          - @products.includes(:catalog, :category).take(6).each do |p|
            %div(class="col-xs-6 col-md-4 col-lg-3")
              = link_to catalog_category_product_url(p.catalog, p.category, p), class: "block block-product" do
                = image_tag p.photo, alt: p.name, class: 'bp-photo', lazy: true
                %div(class="bp-desc")
                  %span
                    %h5(class="heading heading-5") #{p.name}
                  %span
                    %p(class="text text-3") 
                      %span.is-primary #{p.catalog.name} 
                      %span - #{p.category.name}
        - else
          %div(class="col-xs-12 is-centered")
            %h5(class="heading heading-5") Currently this list is empty.

    更新3

    rake db:drop db:create db:migrate

    修复了问题。。

    1 回复  |  直到 6 年前
        1
  •  2
  •   Thomas R. Koll    6 年前

    一大堆的事情和很难帮助没有实际运行的代码。

    首先,熟悉命名事物的良好实践。 @catalogs.each do |pc| @catalogs.each do |catalog| .

    if !@products.empty? @product.count ,这会触发两个查询,我的建议是将计数写入 @products_count 把它换成空的?具有 @product_count > 0

    scope 在模型中替换 .where(open: true)

    在 @products.includes(:catalog, :category) 您可以删除 catalog 因为你已经按产品目录走了,可以使用 pc )而不是 product.catalog

    如果 catalog_category_product_url catalog/5/category/2/product/23 )那你就可以了 catalog_category_product_url(product.catalog_id, product.category_id, product)

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