Fix facet search error

lib/meilisearch-rails.rb

@@ -282,6 +282,15 @@ def initialize(index_uid, raise_on_failure, options)
         end
       end
 
+      # Maually define facet_search due to complications with **opts in ruby 2.*
+      def facet_search(*args, **opts)
+        SafeIndex.log_or_throw(:facet_search, @raise_on_failure) do
+          return MeiliSearch::Rails.black_hole unless MeiliSearch::Rails.active?
+
+          @index.facet_search(*args, **opts)
+        end
+      end
+
       # special handling of wait_for_task to handle null task_id
       def wait_for_task(task_uid)
         return if task_uid.nil? && !@raise_on_failure # ok

spec/integration_spec.rb

@@ -641,6 +641,21 @@
     expect(results.facets_distribution['genre'].size).to eq(3)
   end
 
+  it 'does not error on facet_search' do
+    genres = %w[Legend Fiction Crime].cycle
+    authors = %w[A B C].cycle
+
+    5.times do
+      Book.create! name: Faker::Book.title, author: authors.next, genre: genres.next
+    end
+
+    expect do
+      Book.index.facet_search('genre', 'Fic', filter: 'author = A')
+      Book.index.facet_search('genre', filter: 'author = A')
+      Book.index.facet_search('genre')
+    end.not_to raise_error
+  end
+
   context 'with Marshal serialization' do
     let(:found_books) { Book.search('*') }
     let(:marshaled_books) { Marshal.dump(found_books) }

spec/support/active_record_classes.rb

@@ -412,7 +412,7 @@ class Book < ActiveRecord::Base
   meilisearch synchronous: true, index_uid: safe_index_uid('SecuredBook'), sanitize: true do
     searchable_attributes [:name]
     typo_tolerance min_word_size_for_typos: { one_typo: 5, twoTypos: 8 }
-    filterable_attributes [:genre]
+    filterable_attributes %i[genre author]
     faceting max_values_per_facet: 3
 
     add_index safe_index_uid('BookAuthor') do