Fixed missing bind values when using #in with scope that joins polymorphic association

lib/squeel/adapters/active_record/4.1/relation_extensions.rb

@@ -197,7 +197,7 @@ def build_where(opts, other = [])
                 preprocess_attrs_with_ar(attributes)
               when Squeel::Nodes::Node
                 arg.grep(::ActiveRecord::Relation) do |rel|
-                  self.bind_values += rel.bind_values
+                  self.bind_values += rel.arel.bind_values + rel.bind_values
                 end
                 arg
               else

spec/squeel/adapters/active_record/relation_extensions_spec.rb

@@ -632,6 +632,13 @@ module ActiveRecord
             articles.should have(3).articles
           end
 
+          it 'allows a subquery from Relation that  in a Squeel node' do
+            names = [Person.first.name, Person.last.name]
+            scope = Person.where(name: names).joins(:notes).select { notes.notable_id }
+            people = Person.where { id.in scope }
+            people.should eq([Person.first, Person.last])
+          end
+
           it 'is backwards-compatible with "where.not"' do
             if activerecord_version_at_least '4.0.0'
               name = Person.first.name