Add specs configuration

spec/dummy/app/admin/authors.rb

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+# frozen_string_literal: true
+
+ActiveAdmin.register Author do
+  menu priority: 1
+
+  permit_params :name, :email, :age, :avatar, profile_attributes: %i[id description _destroy]
+
+  index do
+    selectable_column
+    id_column
+    column :name
+    column :email
+    column :created_at
+    actions
+  end
+
+  filter :name
+  filter :created_at
+
+  show do
+    attributes_table do
+      row :name
+      row :email
+      row :age
+      row :avatar do |record|
+        image_tag url_for(record.avatar), style: 'max-width:800px;max-height:500px' if record.avatar.attached?
+      end
+      row :created_at
+      row :updated_at
+      row :profile
+    end
+    active_admin_comments
+  end
+
+  form do |f|
+    f.inputs do
+      f.input :name
+      f.input :email
+      f.input :age
+      f.input :avatar,
+              as: :file,
+              hint: (object.avatar.attached? ? "Current: #{object.avatar.filename}" : nil)
+    end
+    f.has_many :profile, allow_destroy: true do |ff|
+      ff.input :description
+    end
+    f.actions
+  end
+end

spec/dummy/app/admin/dashboard.rb

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+ActiveAdmin.register_page "Dashboard" do
+  menu priority: 1, label: proc { I18n.t("active_admin.dashboard") }
+
+  content title: proc { I18n.t("active_admin.dashboard") } do
+    div class: "blank_slate_container", id: "dashboard_default_message" do
+      span class: "blank_slate" do
+        span I18n.t("active_admin.dashboard_welcome.welcome")
+        small I18n.t("active_admin.dashboard_welcome.call_to_action")
+      end
+    end
+
+    # Here is an example of a simple dashboard with columns and panels.
+    #
+    # columns do
+    #   column do
+    #     panel "Recent Posts" do
+    #       ul do
+    #         Post.recent(5).map do |post|
+    #           li link_to(post.title, admin_post_path(post))
+    #         end
+    #       end
+    #     end
+    #   end
+
+    #   column do
+    #     panel "Info" do
+    #       para "Welcome to ActiveAdmin."
+    #     end
+    #   end
+    # end
+  end # content
+end

spec/dummy/app/admin/posts.rb

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+# frozen_string_literal: true
+
+ActiveAdmin.register Post do
+end

spec/dummy/app/admin/tags.rb

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+# frozen_string_literal: true
+
+ActiveAdmin.register Tag do
+end

spec/dummy/app/assets/config/manifest.js

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+//= link_tree ../images
+//= link_directory ../stylesheets .css
+// OFF link active_storage_db_manifest.js

spec/dummy/app/assets/javascripts/active_admin.js

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+//= require active_admin/base

spec/dummy/app/assets/stylesheets/active_admin.scss

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+// SASS variable overrides must be declared before loading up Active Admin's styles.
+//
+// To view the variables that Active Admin provides, take a look at
+// `app/assets/stylesheets/active_admin/mixins/_variables.scss` in the
+// Active Admin source.
+//
+// For example, to change the sidebar width:
+// $sidebar-width: 242px;
+
+// Active Admin's got SASS!
+@import "active_admin/mixins";
+@import "active_admin/base";
+
+// Overriding any non-variable SASS must be done after the fact.
+// For example, to change the default status-tag color:
+//
+//   .status_tag { background: #6090DB; }

spec/dummy/app/assets/stylesheets/application.css

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+/*
+ * This is a manifest file that'll be compiled into application.css, which will include all the files
+ * listed below.
+ *
+ * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
+ * or any plugin's vendor/assets/stylesheets directory can be referenced here using a relative path.
+ *
+ * You're free to add application-wide styles to this file and they'll appear at the bottom of the
+ * compiled file so the styles you add here take precedence over styles defined in any other CSS/SCSS
+ * files in this directory. Styles in this file should be added after the last require_* statement.
+ * It is generally better to create a new file per style scope.
+ *
+ *= require_tree .
+ *= require_self
+ */

spec/dummy/app/channels/application_cable/channel.rb

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+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

spec/dummy/app/channels/application_cable/connection.rb

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+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

spec/dummy/app/controllers/application_controller.rb

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+class ApplicationController < ActionController::Base
+end

spec/dummy/app/helpers/application_helper.rb

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+module ApplicationHelper
+end

spec/dummy/app/javascript/packs/application.js

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+// This is a manifest file that'll be compiled into application.js, which will include all the files
+// listed below.
+//
+// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
+// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
+//
+// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
+// compiled file. JavaScript code in this file should be added after the last require_* statement.
+//
+// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
+// about supported directives.
+//
+//= require rails-ujs
+//= require activestorage
+//= require_tree .

spec/dummy/app/jobs/application_job.rb

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+class ApplicationJob < ActiveJob::Base
+  # Automatically retry jobs that encountered a deadlock
+  # retry_on ActiveRecord::Deadlocked
+
+  # Most jobs are safe to ignore if the underlying records are no longer available
+  # discard_on ActiveJob::DeserializationError
+end

spec/dummy/app/mailers/application_mailer.rb

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+class ApplicationMailer < ActionMailer::Base
+  default from: 'from@example.com'
+  layout 'mailer'
+end

spec/dummy/app/models/application_record.rb

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+# frozen_string_literal: true
+
+class ApplicationRecord < ActiveRecord::Base
+  self.abstract_class = true
+
+  scope :published, -> {}
+end

spec/dummy/app/models/author.rb

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+# frozen_string_literal: true
+
+class Author < ApplicationRecord
+  has_many :posts
+  has_many :published_posts, -> { published }, class_name: 'Post'
+  has_many :recent_posts, -> { recents }, class_name: 'Post'
+
+  has_many :tags, through: :posts
+
+  has_one :profile, inverse_of: :author, dependent: :destroy
+
+  has_one_attached :avatar
+
+  accepts_nested_attributes_for :profile, allow_destroy: true
+
+  validates :email, format: { with: /\A[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\z/i, message: 'Invalid email' }
+
+  validate -> {
+    errors.add( :base, 'Invalid age' ) if !age || age.to_i % 3 == 1
+  }
+
+  def to_s
+    "#{name} (#{age})"
+  end
+end

spec/dummy/app/models/post.rb

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+# frozen_string_literal: true
+
+class Post < ApplicationRecord
+  enum state: %i[available unavailable arriving]
+
+  belongs_to :author, inverse_of: :posts, autosave: true
+
+  has_one :author_profile, through: :author, source: :profile
+
+  has_many :post_tags, inverse_of: :post, dependent: :destroy
+  has_many :tags, through: :post_tags
+
+  validates :title, allow_blank: false, presence: true
+
+  scope :published, -> { where(published: true) }
+  scope :recents, -> { where('created_at > ?', Date.today - 8.month) }
+
+  def short_title
+    title.truncate 10
+  end
+
+  def upper_title
+    title.upcase
+  end
+end

spec/dummy/app/models/post_tag.rb

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+# frozen_string_literal: true
+
+class PostTag < ApplicationRecord
+  belongs_to :post, inverse_of: :post_tags
+  belongs_to :tag,  inverse_of: :post_tags
+
+  validates :post, presence: true
+  validates :tag,  presence: true
+end

spec/dummy/app/models/profile.rb

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+# frozen_string_literal: true
+
+class Profile < ApplicationRecord
+  belongs_to :author, inverse_of: :profile, touch: true
+
+  def to_s
+    description
+  end
+end

spec/dummy/app/models/tag.rb

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+# frozen_string_literal: true
+
+class Tag < ApplicationRecord
+  has_many :post_tags, inverse_of: :tag, dependent: :destroy
+  has_many :posts, through: :post_tags
+end

spec/dummy/app/views/layouts/application.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Dummy</title>
+    <%= csrf_meta_tags %>
+    <%= csp_meta_tag %>
+
+    <%= stylesheet_link_tag    'application', media: 'all' %>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

spec/dummy/app/views/layouts/mailer.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+    <style>
+      /* Email styles need to be inline */
+    </style>
+  </head>
+
+  <body>
+    <%= yield %>
+  </body>
+</html>

spec/dummy/app/views/layouts/mailer.text.erb

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+<%= yield %>