Fixes #3809 - Ticket owner selection is not updated if owner selection should be empty.

app/models/core_workflow/attributes/user.rb

@@ -3,8 +3,11 @@
 class CoreWorkflow::Attributes::User < CoreWorkflow::Attributes::Base
 
   def values
-    return ticket_owner_id_bulk if @attributes.payload['screen'] == 'overview_bulk'
+    if @attribute[:name] == 'owner_id' && @attributes.payload['class_name'] == 'Ticket'
-    return ticket_owner_id if @attributes.payload['class_name'] == 'Ticket' && @attribute[:name] == 'owner_id'
+      return ticket_owner_id_bulk if @attributes.payload['screen'] == 'overview_bulk'
+
+      return ticket_owner_id
+    end
 
     []
   end
@@ -35,7 +38,10 @@ class CoreWorkflow::Attributes::User < CoreWorkflow::Attributes::Base
   def ticket_owner_id
     return [''] if @attributes.selected_only.group_id.blank?
 
-    group_owner_ids
+    owner_ids = group_owner_ids
+    return [''] if owner_ids.blank?
+
+    owner_ids
   end
 
   def group_owner_ids

spec/models/core_workflow_spec.rb

@@ -207,6 +207,24 @@ RSpec.describe CoreWorkflow, type: :model do
         expect(result[:restrict_values]['owner_id']).to eq(['', action_user.id.to_s])
       end
     end
+
+    describe 'Ticket owner selection is not updated if owner selection should be empty #3809' do
+      let(:group_no_owners) { create(:group) }
+      let(:ticket2) { create(:ticket, group: group_no_owners) }
+      let(:payload) do
+        base_payload.merge('screen' => 'overview_bulk', 'params' => { 'ticket_ids' => ticket2.id.to_s })
+      end
+
+      before do
+        action_user.group_names_access_map = {
+          group_no_owners.name => %w[create read change overview],
+        }
+      end
+
+      it 'does not show any owners for group with no full permitted users' do
+        expect(result[:restrict_values]['owner_id']).to eq([''])
+      end
+    end
   end
 
   describe '.perform - Default - State' do
@@ -1717,4 +1735,21 @@ RSpec.describe CoreWorkflow, type: :model do
       end
     end
   end
+
+  describe 'Ticket owner selection is not updated if owner selection should be empty #3809' do
+    let(:group_no_owners) { create(:group) }
+    let(:payload) do
+      base_payload.merge('params' => { 'group_id' => group_no_owners.id })
+    end
+
+    before do
+      action_user.group_names_access_map = {
+        group_no_owners.name => %w[create read change overview],
+      }
+    end
+
+    it 'does not show any owners because no one has full permissions' do
+      expect(result[:restrict_values]['owner_id']).to eq([''])
+    end
+  end
 end