Added project status and asynchronous initialization

app/controllers/projects_controller.rb

@@ -4,7 +4,7 @@ class ProjectsController < ApplicationController
   before_action :fetch_project!, only: %w[show edit update destroy]
 
   def index
-    @projects = Project.all
+    @projects = available_projects
   end
 
   def show; end
@@ -16,7 +16,7 @@ class ProjectsController < ApplicationController
   def create
     @project = Project.new(project_params)
     if @project.save
-      redirect_to @project
+      redirect_to url_for(action: :index), notice: "Project #{@project.name} being created."
     else
       render :new, status: :unprocessable_entity
     end
@@ -36,8 +36,12 @@ class ProjectsController < ApplicationController
 
   private
 
+  def available_projects
+    Project.ready
+  end
+
   def fetch_project!
-    @project = Project.find_by!(code: params[:id])
+    @project = available_projects.find_by!(code: params[:id])
     self.current_project = @project
   end
 

app/jobs/project_post_init_job.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class ProjectPostInitJob < ApplicationJob
+  queue_as :default
+
+  def perform(project_id)
+    project = Project.preparing.find(project_id)
+
+    create_tasks_number_sequence(project)
+    project.update!(status: :ready)
+  end
+
+  private
+
+  def create_tasks_number_sequence(project)
+    Project.connection.execute "CREATE SEQUENCE IF NOT EXISTS #{project.tasks_number_sequence_name} AS INT UNSIGNED"
+  end
+end

app/models/project.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class Project < ApplicationRecord
+  enum :status, %i[preparing ready archived].index_by(&:itself), default: :preparing
+
   validates :name, :code, presence: true
   validates :code, exclusion: { in: %w[new] }, uniqueness: true, format: { with: /\A[a-z]{2,}\z/ }
 
@@ -10,7 +12,7 @@ class Project < ApplicationRecord
 
   normalizes :code, with: ->(code) { code.strip.downcase.gsub(/\W+/, '') }
 
-  after_commit :create_tasks_number_sequence, on: :create
+  after_commit :schedule_post_init_job, on: :create
   after_destroy_commit :drop_tasks_number_sequence
 
   def to_param
@@ -32,8 +34,8 @@ class Project < ApplicationRecord
 
   private
 
-  def create_tasks_number_sequence
-    self.class.connection.execute "CREATE SEQUENCE IF NOT EXISTS #{tasks_number_sequence_name} AS INT UNSIGNED"
+  def schedule_post_init_job
+    ProjectPostInitJob.perform_later id
   end
 
   def drop_tasks_number_sequence