Workflow default status and computing positions

app/controllers/project_admin/workflows/statuses_controller.rb

@@ -17,7 +17,7 @@ module ProjectAdmin
         end
 
         @form = ProjectAdmin::Workflows::Statuses::BatchUpdate.new(form_params)
-        if @form.call(@workflow)
+        if @form.perform(@workflow)
           redirect_to(action: :edit_transitions)
         else
           render :edit
@@ -29,13 +29,14 @@ module ProjectAdmin
       end
 
       def batch_update_transitions
-        form_params = params.expect(workflow: { task_statuses_attributes: [[:id, { next_status_ids: [] }]] })
+        form_params = params.expect(workflow: [:default_status_id,
+                                               { task_statuses_attributes: [[:id, { next_status_ids: [] }]] }])
         if form_params[:task_statuses_attributes].respond_to?(:keys)
           form_params[:task_statuses_attributes] = form_params[:task_statuses_attributes].values
         end
 
         @form = ProjectAdmin::Workflows::Statuses::UpdateTransitions.new(form_params)
-        if @form.call(@workflow)
+        if @form.perform(@workflow)
           redirect_to project_admin_workflow_path(@project, @workflow)
         else
           render :edit_transitions

app/controllers/tasks_controller.rb

@@ -13,7 +13,7 @@ class TasksController < ApplicationController
                Task.all
              end
 
-    @tasks = @tasks.includes(:status, :project, workflow: :task_statuses)
+    @tasks = @tasks.includes(:project, workflow: %i[task_statuses default_status], status: :next_statuses)
   end
 
   def show; end
@@ -21,7 +21,8 @@ class TasksController < ApplicationController
   def new
     @project = self.current_project = fetch_project || Project.order(:name).first
     @workflow = fetch_workflow || @project.workflows.first
-    @form = Tasks::Create.new(project_id: @project.id, workflow_id: @workflow.id)
+    @form = Tasks::Create.new(project_id: @project.id, workflow_id: @workflow.id,
+                              status_id: @workflow.default_status&.id)
   end
 
   def create

app/models/workflow.rb

@@ -6,7 +6,18 @@ class Workflow < ApplicationRecord
   has_many :tasks, dependent: :restrict_with_exception
   has_many :task_statuses, dependent: :restrict_with_error
   accepts_nested_attributes_for :task_statuses, allow_destroy: true
+  belongs_to :default_status, class_name: 'TaskStatus', optional: true
 
   enum :icon, { task: 'task', warning: 'warning' }, default: 'task', scopes: false
   enum :color, { blue: 'blue', gray: 'gray', lime: 'lime', red: 'red', teal: 'teal' }, default: 'gray', scopes: false
+
+  validate :should_own_default_status
+
+  private
+
+  def should_own_default_status
+    return if default_status.nil?
+
+    errors.add(:default_status, 'Should own default status') unless default_status.id.in?(task_status_ids)
+  end
 end

app/services/project_admin/workflows/statuses/batch_update.rb

@@ -40,7 +40,7 @@ module ProjectAdmin
           @task_statuses = Array(attributes).map { |e| TaskStatus.new(e) }
         end
 
-        def call(workflow)
+        def perform(workflow)
           @workflow = workflow
 
           @workflow.assign_attributes(task_statuses_attributes: task_statuses.map(&:to_model_attributes))

app/services/project_admin/workflows/statuses/update_transitions.rb

@@ -12,20 +12,50 @@ module ProjectAdmin
           attribute :next_status_ids
         end
 
-        attr_accessor :task_statuses
+        attr_accessor :workflow, :task_statuses
+
+        attribute :default_status_id, :integer
 
         def self.from_model(workflow)
-          new(task_statuses_attributes: workflow.task_statuses
-            .includes(:next_statuses)
-            .map { |ts| { id: ts.id, next_status_ids: ts.next_status_ids } })
+          new(
+            workflow:,
+            task_statuses_attributes: workflow.task_statuses
+              .includes(:next_statuses)
+              .map { |ts| { id: ts.id, next_status_ids: ts.next_status_ids } },
+            default_status_id: workflow.default_status_id
+          )
         end
 
         def task_statuses_attributes=(attributes)
           @task_statuses = Array(attributes).map { |e| TaskStatus.new(e) }
         end
 
-        def call(workflow)
-          workflow.update(task_statuses_attributes: task_statuses.map(&:attributes))
+        def perform(workflow)
+          @workflow = workflow
+          workflow.assign_attributes(default_status_id:, task_statuses_attributes: task_statuses.map(&:attributes))
+          save workflow
+        end
+
+        after_success do
+          if @workflow.default_status.nil?
+            @workflow.task_statuses.update!(position: 0)
+            return
+          end
+
+          @workflow.transaction do
+            @workflow.default_status.update!(position: 0)
+            seen_status_ids = Set[@workflow.default_status.id]
+            statuses_to_process = [@workflow.default_status]
+
+            until statuses_to_process.empty?
+              status = statuses_to_process.pop
+
+              next_statuses = status.next_statuses.where.not(id: seen_status_ids)
+              next_statuses.update(position: status.position + 1)
+              statuses_to_process.concat(next_statuses.to_a)
+              seen_status_ids.merge(next_statuses.map(&:id))
+            end
+          end
         end
       end
     end

app/view_models/tasks/statuses/selector_view_model.rb

@@ -40,7 +40,11 @@ module Tasks
       private
 
       def workflow_task_statuses
-        @task.workflow.task_statuses.sort_by { |e| [e.position, e.name] }
+        return @task.workflow.task_statuses.sort_by { |e| [e.position, e.name] } if @task.status.next_statuses.empty?
+
+        @task.status.next_statuses.sort_by { |e| [e.position, e.name] }.tap do |statuses|
+          statuses.prepend(@task.status)
+        end
       end
     end
   end

app/views/project_admin/workflows/show.html.slim

@@ -9,5 +9,5 @@ h1
 h2 Statuses
 
 ul
-  - @workflow.task_statuses.each do |status|
+  - @workflow.task_statuses.default_order.each do |status|
     li= task_status_badge(status)

app/views/project_admin/workflows/statuses/edit_transitions.html.slim

@@ -3,6 +3,7 @@
     = f.fields_for :task_statuses do |tsf|
       section
         div= task_status_badge tsf.object
+        div= f.radio_button :default_status_id, tsf.object.id
         div= tsf.collection_checkboxes :next_status_ids, @workflow.task_statuses - [tsf.object], :id, :name
 
     .submit

db/migrate/20260425123859_add_default_status_to_workflows.rb

@@ -0,0 +1,5 @@
+class AddDefaultStatusToWorkflows < ActiveRecord::Migration[8.1]
+  def change
+    add_reference :workflows, :default_status, foreign_key: { to_table: :task_statuses }
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_04_25_112121) do
+ActiveRecord::Schema[8.1].define(version: 2026_04_25_123859) do
   create_table "action_text_rich_texts", charset: "utf8mb4", collation: "utf8mb4_uca1400_ai_ci", force: :cascade do |t|
     t.text "body", size: :long
     t.datetime "created_at", null: false
@@ -114,10 +114,12 @@ ActiveRecord::Schema[8.1].define(version: 2026_04_25_112121) do
   create_table "workflows", charset: "utf8mb4", collation: "utf8mb4_uca1400_ai_ci", force: :cascade do |t|
     t.string "color", null: false
     t.datetime "created_at", null: false
+    t.bigint "default_status_id"
     t.string "icon", null: false
     t.string "name", null: false
     t.bigint "project_id", null: false
     t.datetime "updated_at", null: false
+    t.index ["default_status_id"], name: "index_workflows_on_default_status_id"
     t.index ["project_id", "name"], name: "index_workflows_on_project_id_and_name", unique: true
     t.index ["project_id"], name: "index_workflows_on_project_id"
   end
@@ -130,4 +132,5 @@ ActiveRecord::Schema[8.1].define(version: 2026_04_25_112121) do
   add_foreign_key "tasks", "projects"
   add_foreign_key "tasks", "task_statuses", column: "status_id"
   add_foreign_key "workflows", "projects"
+  add_foreign_key "workflows", "task_statuses", column: "default_status_id"
 end