Make `resolvable_types` a class method

This turns Notable::RESOLVABLE_TYPES into a
`Notable.resolvable_types`. That allows us to override it in EE.

app/models/concerns/noteable.rb

@@ -3,14 +3,16 @@
 module Noteable
   extend ActiveSupport::Concern
-  # `Noteable` class names that support resolvable notes.
-  RESOLVABLE_TYPES = %w(MergeRequest).freeze
-
   class_methods do
     # `Noteable` class names that support replying to individual notes.
     def replyable_types
       %w(Issue MergeRequest)
     end
+
+    # `Noteable` class names that support resolvable notes.
+    def resolvable_types
+      %w(MergeRequest)
+    end
   end
   # The timestamp of the note (e.g. the :created_at or :updated_at attribute if provided via
@@ -36,7 +38,7 @@ module Noteable
   end
   def supports_resolvable_notes?
-    RESOLVABLE_TYPES.include?(base_class_name)
+    self.class.resolvable_types.include?(base_class_name)
   end
   def supports_discussions?
@@ -131,3 +133,5 @@ module Noteable
     )
   end
 end
+
+Noteable.extend(Noteable::ClassMethods)

app/models/concerns/resolvable_note.rb

@@ -12,7 +12,7 @@ module ResolvableNote
     validates :resolved_by, presence: true, if: :resolved?
     # Keep this scope in sync with `#potentially_resolvable?`
-    scope :potentially_resolvable, -> { where(type: RESOLVABLE_TYPES).where(noteable_type: Noteable::RESOLVABLE_TYPES) }
+    scope :potentially_resolvable, -> { where(type: RESOLVABLE_TYPES).where(noteable_type: Noteable.resolvable_types) }
     # Keep this scope in sync with `#resolvable?`
     scope :resolvable, -> { potentially_resolvable.user }

app/models/diff_note.rb

@@ -15,7 +15,9 @@ class DiffNote < Note
   validates :original_position, presence: true
   validates :position, presence: true
   validates :line_code, presence: true, line_code: true, if: :on_text?
-  validates :noteable_type, inclusion: { in: noteable_types }
+  # We need to evaluate the `noteable` types when running the validation since
+  # EE might have added a type when the module was prepended
+  validates :noteable_type, inclusion: { in: -> (_note) { noteable_types } }
   validate :positions_complete
   validate :verify_supported
   validate :diff_refs_match_commit, if: :for_commit?

lib/api/discussions.rb

@@ -206,7 +206,7 @@ module API
           delete_note(noteable, params[:note_id])
         end
-        if Noteable::RESOLVABLE_TYPES.include?(noteable_type.to_s)
+        if Noteable.resolvable_types.include?(noteable_type.to_s)
           desc "Resolve/unresolve an existing #{noteable_type.to_s.downcase} discussion" do
             success Entities::Discussion
           end

spec/models/concerns/noteable_spec.rb

@@ -260,4 +260,16 @@ describe Noteable do
       end
     end
   end
+
+  describe '.replyable_types' do
+    it 'exposes the replyable types' do
+      expect(described_class.replyable_types).to include('Issue', 'MergeRequest')
+    end
+  end
+
+  describe '.resolvable_types' do
+    it 'exposes the replyable types' do
+      expect(described_class.resolvable_types).to include('MergeRequest')
+    end
+  end
 end