each_attributes

# File activerecord/lib/active_record/relation/where_clause.rb, line 126
        def each_attributes
          predicates.each do |node|
            attr = extract_attribute(node) || begin
              node.left if equality_node?(node) && node.left.is_a?(Arel::Predications)
            end

            yield attr, node if attr
          end
        end