Query objects if readonly_value is false, skip them only if nil.

activerecord/lib/active_record/relation.rb

@@ -61,13 +61,13 @@ def respond_to?(method, include_private = false)
     def to_a
       return @records if loaded?
 
-      @records = if @readonly_value
-        IdentityMap.without do
+      @records = if @readonly_value.nil?
         eager_loading? ? find_with_associations : @klass.find_by_sql(arel.to_sql, @bind_values)
-        end
       else
+        IdentityMap.without do
           eager_loading? ? find_with_associations : @klass.find_by_sql(arel.to_sql, @bind_values)
         end
+      end
 
       preload = @preload_values
       preload +=  @includes_values unless eager_loading?