Extract Arel.arel_node? helper method

activerecord/lib/active_record/attribute_methods.rb

@@ -194,9 +194,7 @@ module ActiveRecord
 
       def disallow_raw_sql!(args, permit: COLUMN_NAME) # :nodoc:
         unexpected = args.reject do |arg|
-          arg.kind_of?(Arel::Node) ||
+          Arel.arel_node?(arg) ||
-            arg.is_a?(Arel::Nodes::SqlLiteral) ||
-            arg.is_a?(Arel::Attributes::Attribute) ||
             arg.to_s.split(/\s*,\s*/).all? { |part| permit.match?(part) }
         end
 

activerecord/lib/active_record/relation.rb

@@ -635,7 +635,7 @@ module ActiveRecord
       def _substitute_values(values)
         values.map do |name, value|
           attr = arel_attribute(name)
-          unless value.is_a?(Arel::Node) || value.is_a?(Arel::Attribute) || value.is_a?(Arel::Nodes::SqlLiteral)
+          unless Arel.arel_node?(value)
             type = klass.type_for_attribute(attr.name)
             value = predicate_builder.build_bind_attribute(attr.name, type.cast(value))
           end

activerecord/lib/arel.rb

@@ -35,6 +35,11 @@ module Arel # :nodoc: all
   def self.star
     sql "*"
   end
+
+  def self.arel_node?(value)
+    value.is_a?(Arel::Node) || value.is_a?(Arel::Attribute) || value.is_a?(Arel::Nodes::SqlLiteral)
+  end
+
   ## Convenience Alias
   Node = Arel::Nodes::Node
 end