New error message recreating projects on pending delete

app/models/concerns/valid_attribute.rb

+module ValidAttribute
+  extend ActiveSupport::Concern
+
+  # Checks whether an attribute has failed validation or not
+  #
+  # +attribute+ The symbolised name of the attribute i.e :name
+  def valid_attribute?(attribute)
+    self.errors.empty? || self.errors.messages[attribute].nil?
+  end
+end

app/models/project.rb

@@ -12,6 +12,7 @@ class Project < ActiveRecord::Base
   include AfterCommitQueue
   include CaseSensitivity
   include TokenAuthenticatable
+  include ValidAttribute
   include ProjectFeaturesCompatibility
   include SelectForProjectAuthorization
   include Routable
@@ -65,6 +66,8 @@ class Project < ActiveRecord::Base
     end
   end
 
+  after_validation :check_pending_delete
+
   ActsAsTaggableOn.strict_case_match = true
   acts_as_taggable_on :tags
 
@@ -1320,4 +1323,21 @@ class Project < ActiveRecord::Base
     stats = statistics || build_statistics
     stats.update(namespace_id: namespace_id)
   end
+
+  def check_pending_delete
+    return if valid_attribute?(:name) && valid_attribute?(:path)
+    return unless pending_delete_twin
+
+    %i[route route.path name path].each do |error|
+      errors.delete(error)
+    end
+
+    errors.add(:base, "The project is still being deleted. Please try again later.")
+  end
+
+  def pending_delete_twin
+    return false unless path
+
+    Project.unscoped.where(pending_delete: true).find_with_namespace(path_with_namespace)
+  end
 end

changelogs/unreleased/fix-project-delete-tooltip.yml

+---
+title: Fix project queued for deletion re-creation tooltip
+merge_request: 
+author: 

spec/models/project_spec.rb

@@ -190,34 +190,54 @@ describe Project, models: true do
     end
 
     it 'does not allow an invalid URI as import_url' do
-      project2 = build(:project, import_url: 'invalid://')
+      project2 = build(:empty_project, import_url: 'invalid://')
 
       expect(project2).not_to be_valid
     end
 
     it 'does allow a valid URI as import_url' do
-      project2 = build(:project, import_url: 'ssh://test@gitlab.com/project.git')
+      project2 = build(:empty_project, import_url: 'ssh://test@gitlab.com/project.git')
 
       expect(project2).to be_valid
     end
 
     it 'allows an empty URI' do
-      project2 = build(:project, import_url: '')
+      project2 = build(:empty_project, import_url: '')
 
       expect(project2).to be_valid
     end
 
     it 'does not produce import data on an empty URI' do
-      project2 = build(:project, import_url: '')
+      project2 = build(:empty_project, import_url: '')
 
       expect(project2.import_data).to be_nil
     end
 
     it 'does not produce import data on an invalid URI' do
-      project2 = build(:project, import_url: 'test://')
+      project2 = build(:empty_project, import_url: 'test://')
 
       expect(project2.import_data).to be_nil
     end
+
+    describe 'project pending deletion' do
+      let!(:project_pending_deletion) do
+        create(:empty_project,
+               pending_delete: true)
+      end
+      let(:new_project) do
+        build(:empty_project,
+              name: project_pending_deletion.name,
+              namespace: project_pending_deletion.namespace)
+      end
+
+      before do
+        new_project.validate
+      end
+
+      it 'contains errors related to the project being deleted' do
+        expect(new_project.errors.full_messages.first).to eq('The project is still being deleted. Please try again later.')
+      end
+    end
   end
 
   describe 'default_scope' do