Update API to accept None and Any

app/finders/issuable_finder.rb

@@ -193,7 +193,19 @@ class IssuableFinder
   end
 
   def filter_by_no_milestone?
-    milestones? && params[:milestone_title] == Milestone::None.title
+    [FILTER_NONE, Milestone::None.title].include?(params[:milestone_title].to_s.downcase)
+  end
+
+  def filter_by_any_milestone?
+    [FILTER_ANY, Milestone::Any.title].include?(params[:milestone_title].to_s.downcase)
+  end
+
+  def filter_by_upcoming_milestone?
+    params[:milestone_title] == Milestone::Upcoming.name
+  end
+
+  def filter_by_started_milestone?
+    params[:milestone_title] == Milestone::Started.name
   end
 
   def milestones
@@ -432,18 +444,6 @@ class IssuableFinder
   end
   # rubocop: enable CodeReuse/ActiveRecord
 
-  def filter_by_upcoming_milestone?
-    params[:milestone_title] == Milestone::Upcoming.name
-  end
-
-  def filter_by_any_milestone?
-    params[:milestone_title] == Milestone::Any.title
-  end
-
-  def filter_by_started_milestone?
-    params[:milestone_title] == Milestone::Started.name
-  end
-
   # rubocop: disable CodeReuse/ActiveRecord
   def by_milestone(items)
     if milestones?

spec/finders/issues_finder_spec.rb

@@ -144,19 +144,31 @@ describe IssuesFinder do
       end
 
       context 'filtering by no milestone' do
-        let(:params) { { milestone_title: Milestone::None.title } }
+        let(:params) { { milestone_title: 'None' } }
 
         it 'returns issues with no milestone' do
           expect(issues).to contain_exactly(issue2, issue3, issue4)
         end
+
+        it 'returns issues with no milestone (deprecated)' do
+          params[:milestone_title] = Milestone::None.title
+
+          expect(issues).to contain_exactly(issue2, issue3, issue4)
+        end
       end
 
       context 'filtering by any milestone' do
-        let(:params) { { milestone_title: Milestone::Any.title } }
+        let(:params) { { milestone_title: 'Any' } }
 
         it 'returns issues with any assigned milestone' do
           expect(issues).to contain_exactly(issue1)
         end
+
+        it 'returns issues with any assigned milestone (deprecated)' do
+          params[:milestone_title] = Milestone::Any.title
+
+          expect(issues).to contain_exactly(issue1)
+        end
       end
 
       context 'filtering by upcoming milestone' do

spec/requests/api/issues_spec.rb

@@ -55,8 +55,8 @@ describe API::Issues do
   end
   let!(:note) { create(:note_on_issue, author: user, project: project, noteable: issue) }
 
-  let(:no_milestone_title) { URI.escape(Milestone::None.title) }
-  let(:any_milestone_title) { URI.escape(Milestone::Any.title) }
+  let(:no_milestone_title) { "None" }
+  let(:any_milestone_title) { "Any" }
 
   before(:all) do
     project.add_reporter(user)