Initial commit

db/migrate/20190204063948_add_account_to_projects.rb

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+class AddAccountToProjects < ActiveRecord::Migration[5.2]
+  def up
+    add_reference :projects, :account, foreign_key: true
+    migrate_data_up
+    remove_reference :projects, :user
+  end
+
+  def down
+    add_reference :projects, :user, foreign_key: true
+    migrate_data_down
+    remove_reference :projects, :account
+  end
+
+  private
+
+  class Project < ActiveRecord::Base
+    belongs_to :account
+    belongs_to :user
+  end
+
+  def migrate_data_up
+    say "Setting Project#account.."
+    
+    Project.reset_column_information
+    Project.find_each do |project|
+      project.update!(account: project.user.account)
+    end
+
+    say "Done."
+  end
+
+  def migrate_data_down
+    say "Setting Project#user.."
+
+    Project.reset_column_information
+    Project.find_each do |project|
+      project.update!(user: project.account.users.first)
+    end
+
+    say "Done."
+  end
+end