Status transitions editing

app/controllers/project_admin/workflows/statuses_controller.rb

@@ -18,12 +18,30 @@ module ProjectAdmin
 
         @form = ProjectAdmin::Workflows::Statuses::BatchUpdate.new(form_params)
         if @form.call(@workflow)
-          redirect_to project_admin_workflow_path(@project, @workflow)
+          redirect_to(action: :edit_transitions)
         else
           render :edit
         end
       end
 
+      def edit_transitions
+        @form = ProjectAdmin::Workflows::Statuses::UpdateTransitions.from_model(@workflow)
+      end
+
+      def batch_update_transitions
+        form_params = params.expect(workflow: { 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)
+          redirect_to project_admin_workflow_path(@project, @workflow)
+        else
+          render :edit_transitions
+        end
+      end
+
       private
 
       def fetch_workflow

app/helpers/project_admin_helper.rb

@@ -17,7 +17,8 @@ module ProjectAdminHelper
   def project_admin_workflow_frame(workflow, &)
     links = {
       'Data' => edit_project_admin_workflow_path(workflow.project, workflow),
-      'Statuses' => edit_project_admin_workflow_statuses_path(workflow.project, workflow)
+      'Statuses' => edit_project_admin_workflow_statuses_path(workflow.project, workflow),
+      'Transitions' => edit_transitions_project_admin_workflow_statuses_path(workflow.project, workflow)
     }
     title = "Editing workflow #{workflow.name} for project #{workflow.project.name}"
     admin_frame(links, title:, back_path: project_admin_workflow_path(workflow.project, workflow), &)

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

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module ProjectAdmin
+  module Workflows
+    module Statuses
+      class UpdateTransitions < ApplicationService
+        class TaskStatus
+          include ActiveModel::Model
+          include ActiveModel::Attributes
+
+          attribute :id, :integer
+          attribute :next_status_ids
+        end
+
+        attr_accessor :task_statuses
+
+        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 } })
+        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))
+        end
+      end
+    end
+  end
+end

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

@@ -0,0 +1,9 @@
+= project_admin_workflow_frame(@workflow) do
+  = form_with model: @workflow, scope: :workflow, url: transitions_project_admin_workflow_statuses_path(@project, @workflow), method: :put, data: {'turbo-frame': '_top'} do |f|
+    = f.fields_for :task_statuses do |tsf|
+      section
+        div= task_status_badge tsf.object
+        div= tsf.collection_checkboxes :next_status_ids, @workflow.task_statuses - [tsf.object], :id, :name
+
+    .submit
+      = f.submit

config/routes.rb

@@ -25,6 +25,8 @@ Rails.application.routes.draw do
           resources :statuses, only: %i[index] do
             get :edit, on: :collection
             put '/', action: :batch_update, on: :collection
+            get :edit_transitions, on: :collection
+            put '/transitions', action: :batch_update_transitions, on: :collection
           end
         end
       end