Add endpoint to allow users to move lists

app/controllers/projects/board_lists_controller.rb

 class Projects::BoardListsController < Projects::ApplicationController
+  rescue_from ActiveRecord::RecordNotFound, with: :record_not_found
+
   def create
     list = Boards::Lists::CreateService.new(project, list_params).execute
 
@@ -11,9 +13,29 @@ class Projects::BoardListsController < Projects::ApplicationController
     end
   end
 
+  def update
+    service = Boards::Lists::MoveService.new(project, move_params)
+
+    respond_to do |format|
+      if service.execute
+        format.json { head :ok }
+      else
+        format.json { head :unprocessable_entity }
+      end
+    end
+  end
+
   private
 
+  def record_not_found(exception)
+    render json: { error: exception.message }, status: :not_found
+  end
+
   def list_params
     params.require(:list).permit(:label_id)
   end
+
+  def move_params
+    params.require(:list).permit(:position).merge(id: params[:id])
+  end
 end

config/routes.rb

@@ -857,7 +857,7 @@ Rails.application.routes.draw do
         end
 
         resource :board, only: [:show] do
-          resources :lists, only: [:create], controller: :board_lists
+          resources :lists, only: [:create, :update], controller: :board_lists
         end
 
         resources :todos, only: [:create]

spec/controllers/projects/board_lists_controller_spec.rb

@@ -46,4 +46,56 @@ describe Projects::BoardListsController do
       end
     end
   end
+
+  describe 'PATCH #update' do
+    let!(:planning)    { create(:list, board: project.board, position: 1) }
+    let!(:development) { create(:list, board: project.board, position: 2) }
+
+    context 'with valid position' do
+      it 'returns a successful 200 response' do
+        patch :update, namespace_id: project.namespace.to_param,
+                       project_id: project.to_param,
+                       id: planning.to_param,
+                       list: { position: 2 },
+                       format: :json
+
+        expect(response).to have_http_status(200)
+      end
+
+      it 'moves the list to the desired position' do
+        patch :update, namespace_id: project.namespace.to_param,
+                       project_id: project.to_param,
+                       id: planning.to_param,
+                       list: { position: 2 },
+                       format: :json
+
+        expect(planning.reload.position).to eq 2
+      end
+    end
+
+    context 'with invalid position' do
+      it 'returns a unprocessable entity 422 response' do
+        patch :update, namespace_id: project.namespace.to_param,
+                       project_id: project.to_param,
+                       id: planning.to_param,
+                       list: { position: 6 },
+                       format: :json
+
+        expect(response).to have_http_status(422)
+      end
+    end
+
+    context 'with invalid list id' do
+      it 'returns a not found 404 response' do
+        patch :update, namespace_id: project.namespace.to_param,
+                       project_id: project.to_param,
+                       id: 999,
+                       list: { position: 2 },
+                       format: :json
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+  end
 end