diff --git a/.gitignore b/.gitignore
index 965c20d..3846ad1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.rbc
 .bundle
 .config
+.idea
 .yardoc
 Gemfile.lock
 InstalledFiles
diff --git a/.ruby-version b/.ruby-version
index cd57a8b..59aa62c 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.1.5
+2.4.5
diff --git a/lib/louisville/extensions/finder.rb b/lib/louisville/extensions/finder.rb
index 18c8a6b..9b43fac 100644
--- a/lib/louisville/extensions/finder.rb
+++ b/lib/louisville/extensions/finder.rb
@@ -31,20 +31,23 @@ class << self
       module ClassMethods
 
         def find_with_louisville_finder(*args)
-          return find_without_lousville_finder(*args) if args.length != 1
+          return find_without_louisville_finder(*args) if args.length != 1
 
           id = args[0]
           id = id.id if ActiveRecord::Base === id
-          return find_without_louisville_finder(*args) if Louisville::Util.numeric?(id)
 
-          relation_with_louisville_finder.find_one(id)
+          if id.is_a?(String) && !Louisville::Util.numeric?(id)
+            relation_with_louisville_finder.find_one(id)
+          else
+            find_without_louisville_finder(*args)
+          end
         end
 
         private
 
         def relation_with_louisville_finder
           rel = relation_without_louisville_finder
-          rel.extend RelationMethods unless rel.respond_to?(:find_one_with_louisville)
+          rel.extend RelationMethods
           rel
         end
       end
diff --git a/spec/finder_spec.rb b/spec/finder_spec.rb
index b81abb5..ac75e29 100644
--- a/spec/finder_spec.rb
+++ b/spec/finder_spec.rb
@@ -66,5 +66,30 @@ class FinderHistoryUser < ActiveRecord::Base
     }.to raise_error(ActiveRecord::RecordNotFound)
   end
 
+  context "pass-through" do
+    let(:user1) { FinderUser.create! name: "Marco" }
+    let(:user2) { FinderUser.create! name: "Polo" }
+
+    after { FinderUser.delete_all }
+
+    it "uses the original Rails logic for numerical ids" do
+      expect(FinderUser.find(user1.id)).to eq user1
+    end
+
+    it "uses the original Rails logic for multiple ids" do
+      expect(FinderUser.find(user1.id, user2.id)).to match_array [user1, user2]
+
+      expect { FinderUser.find(user1.id, FinderUser.maximum(:id) + 1) }
+        .to raise_error(ActiveRecord::RecordNotFound)
+    end
+
+    it "uses the original Rails logic for an array of ids" do
+      expect(FinderUser.find([user1.id, user2.id])).to match_array [user1, user2]
+
+      expect { FinderUser.find([user1.id, FinderUser.maximum(:id) + 1]) }
+        .to raise_error(ActiveRecord::RecordNotFound)
+
+    end
+  end
 
 end
diff --git a/spec/support/database.yml b/spec/support/database.yml
index f2ef86e..e462aef 100644
--- a/spec/support/database.yml
+++ b/spec/support/database.yml
@@ -1,5 +1,5 @@
 adapter: 'mysql2'
-host: localhost
+host: 127.0.0.1
 database: louisville_test
 encoding: utf8
 username: root