Untie statuses from the project directly (tie to workflows)

app/models/project.rb

@@ -7,8 +7,8 @@ class Project < ApplicationRecord
   validates :code, exclusion: { in: %w[new] }, uniqueness: true, format: { with: /\A[a-z][a-z0-9]{1,}\z/ }
 
   has_many :tasks, dependent: :restrict_with_exception
-  has_many :task_statuses, dependent: :destroy
   has_many :workflows, dependent: :destroy
+  has_many :task_statuses, through: :workflows
 
   has_rich_text :description
 

app/models/task_status.rb

@@ -1,12 +1,12 @@
 # frozen_string_literal: true
 
 class TaskStatus < ApplicationRecord
-  belongs_to :project
   belongs_to :workflow
+  has_one :project, through: :workflow
 
   enum :category, { backlog: 100, analysis: 1000, development: 20_000, fulfillment: 60_000 }
 
-  validates :name, presence: true, uniqueness: { scope: :project }
+  validates :name, presence: true, uniqueness: { scope: :workflow }
   validates :category, presence: true
   validate :associations_should_have_same_project
 

app/models/workflow.rb

@@ -4,7 +4,7 @@ class Workflow < ApplicationRecord
   belongs_to :project
 
   has_many :tasks, dependent: :restrict_with_exception
-  has_many :statuses, class_name: 'TaskStatus', dependent: :restrict_with_error
+  has_many :task_statuses, dependent: :restrict_with_error
 
   enum :icon, { task: 'task', warning: 'warning' }, default: 'task', scopes: false
   enum :color, { blue: 'blue', gray: 'gray', yellow: 'yellow', red: 'red' }, default: 'gray', scopes: false