[Rails] Implementation of PV number ranking using impressionist

Target

Development environment

・ Ruby: 2.5.7 Rails: 5.2.4 ・ Vagrant: 2.2.7 -VirtualBox: 6.1 ・ OS: macOS Catalina

Premise

The following has been implemented.

・ Slim introduction -Login function implementation

Implementation

1. Introduced ʻimpressionist`

** * Be careful to specify the version! (An error occurred if not specified) **

Gemfile

gem 'impressionist', '~>1.6.1'

Terminal

$ bundle

Terminal

$ rails g impressionist

Terminal

$ rails db:migrate

schema.rb

create_table "impressions", force: :cascade do |t|
  t.string "impressionable_type"
  t.integer "impressionable_id"
  t.integer "user_id"
  t.string "controller_name"
  t.string "action_name"
  t.string "view_name"
  t.string "request_hash"
  t.string "ip_address"
  t.string "session_hash"
  t.text "message"
  t.text "referrer"
  t.text "params"
  t.datetime "created_at", null: false
  t.datetime "updated_at", null: false
  t.index ["controller_name", "action_name", "ip_address"], name: "controlleraction_ip_index"
  t.index ["controller_name", "action_name", "request_hash"], name: "controlleraction_request_index"
  t.index ["controller_name", "action_name", "session_hash"], name: "controlleraction_session_index"
  t.index ["impressionable_type", "impressionable_id", "ip_address"], name: "poly_ip_index"
  t.index ["impressionable_type", "impressionable_id", "params"], name: "poly_params_request_index"
  t.index ["impressionable_type", "impressionable_id", "request_hash"], name: "poly_request_index"
  t.index ["impressionable_type", "impressionable_id", "session_hash"], name: "poly_session_index"
  t.index ["impressionable_type", "message", "impressionable_id"], name: "impressionable_type_message_index"
  t.index ["user_id"], name: "index_impressions_on_user_id"
end

2. Add column

Terminal

$ rails g migration AddImpressionsCountToUsers impressions_count:integer

~_add_impressions_count_to_users.rb

class AddImpressionsCountToUsers < ActiveRecord::Migration[5.2]
  def change
    # 「default:Added "0"
    add_column :users, :impressions_count, :integer, default: 0
  end
end

Terminal

$ rails db:migrate

3. Edit the model

user.rb

#Postscript
is_impressionable counter_cache: true

is_impressionable ➡︎ Allow ʻimpressionist` to be used in the User model.

** * Please be sure to add counter_cache: true. ** **

4. Edit the controller

users_controller.rb

def index
  @users = User.order(impressions_count: 'DESC') #Added sorting function
end

def show
  @user = User.find(params[:id])
  impressionist(@user, nil, unique: [:session_hash]) #Postscript
end

User.order(impressions_count: 'DESC') ➡︎ Sort the user list in descending order of the number of PVs.

impressionist(@user, nil, unique: [:session_hash]) ➡︎ When you access the user details page, the number of PVs increases by one.

[When measuring by IP address] impressionist(@tourist_spot, nil, unique: [:impressionable_id, :ip_address])

** * The number of PVs can be counted only once per user so that the number of PVs cannot be increased voluntarily. ** **

5. Edit the view

slim:users/index.html.slim

table.table
  thead
    tr
      th
        |Ranking
      th
        |Full name
      th
        |Number of PV

  tbody
    - @users.each.with_index(1) do |user, index|
      tr
        td
          = index
          |Rank
        td
          = link_to user do
            = user.name
        td
          /Display the number of PV
          = user.impressions_count