Do not allow to move issue if it has not been persisted

CHANGELOG

@@ -4,7 +4,7 @@ v 8.7.0 (unreleased)
   - Make HTTP(s) label consistent on clone bar (Stan Hu)
 v 8.6.1 (unreleased)
-
+  - Do not allow to move issue if it has not been persisted
 v 8.6.0
   - Add ability to move issue to another project

app/models/issue.rb

@@ -146,7 +146,8 @@ class Issue < ActiveRecord::Base
       return false unless user.can?(:admin_issue, to_project)
     end
-    !moved? && user.can?(:admin_issue, self.project)
+    !moved? && persisted? &&
+      user.can?(:admin_issue, self.project)
   end
   def to_branch_name

app/services/issues/move_service.rb

@@ -78,6 +78,8 @@ module Issues
     end
     def unfold_references(content)
+      return unless content
+
       rewriter = Gitlab::Gfm::ReferenceRewriter.new(content, @old_project,
                                                     @current_user)
       rewriter.rewrite(@new_project)

app/views/shared/issuable/_form.html.haml

@@ -85,7 +85,7 @@
       - if can? current_user, :admin_label, issuable.project
         = link_to 'Create new label', new_namespace_project_label_path(issuable.project.namespace, issuable.project), target: :blank
-- if issuable.can_move?(current_user) && issuable.persisted?
+- if issuable.can_move?(current_user)
   %hr
   .form-group
     = label_tag :move_to_project_id, 'Move', class: 'control-label'

spec/models/issue_spec.rb

@@ -152,6 +152,11 @@ describe Issue, models: true do
       it { is_expected.to eq true }
+      context 'issue not persisted' do
+        let(:issue) { build(:issue, project: project) }
+        it { is_expected.to eq false }
+      end
+
       context 'checking destination project also' do
         subject { issue.can_move?(user, to_project) }
         let(:to_project) { create(:project) }

spec/services/issues/move_service_spec.rb

@@ -208,6 +208,12 @@ describe Issues::MoveService, services: true do
         it { expect { move }.to raise_error(StandardError, /permissions/) }
       end
+
+      context 'issue is not persisted' do
+        include_context 'user can move issue'
+        let(:old_issue) { build(:issue, project: old_project, author: author) }
+        it { expect { move }.to raise_error(StandardError, /permissions/) }
+      end
     end
   end
 end