Add global without_auto_index_scope method

The implementation is very straightforward, for now it only has a block
form. We could add a toggle if that is useful in the future.

Author: ellnix

lib/meilisearch-rails.rb

@@ -496,7 +496,8 @@ def ms_without_auto_index_scope=(value)
       end
 
       def ms_without_auto_index_scope
-        Thread.current["ms_without_auto_index_scope_for_#{model_name}"]
+        Thread.current['ms_without_auto_index_scope'] ||
+          Thread.current["ms_without_auto_index_scope_for_#{model_name}"]
       end
 
       def ms_reindex!(batch_size = MeiliSearch::Rails::IndexSettings::DEFAULT_BATCH_SIZE, synchronous = false)

lib/meilisearch/rails/configuration.rb

@@ -51,6 +51,16 @@ def client
                        .merge(client_agents: MeiliSearch::Rails.qualified_version)
         )
       end
+
+      def without_auto_index(&block)
+        Thread.current['ms_without_auto_index_scope'] = true
+
+        begin
+          yield
+        ensure
+          Thread.current['ms_without_auto_index_scope'] = false
+        end
+      end
     end
   end
 end

spec/model_methods_spec.rb

@@ -70,6 +70,26 @@
     end
   end
 
+  # while this is not a model method, it's tested here since it's logically similar
+  # to the model method by the same name
+  describe 'Meilisearch::Rails.without_auto_index' do
+    it 'disables auto indexing for all models' do
+      TestUtil.reset_colors!
+      TestUtil.reset_books!
+
+      MeiliSearch::Rails.without_auto_index do
+        Color.create!(name: 'blue', short_name: 'b', hex: 0xFF0000)
+        Book.create!(
+          name: 'Frankenstein', author: 'Mary Shelley',
+          premium: false, released: true
+        )
+      end
+
+      expect(Color.search('blue')).to be_empty
+      expect(Book.search('Frankenstein')).to be_empty
+    end
+  end
+
   describe '.index_documents' do
     it 'updates existing documents' do
       TestUtil.reset_colors!