equalities

# File activerecord/lib/active_record/relation/where_clause.rb, line 145
        def equalities(predicates, equality_only)
          equalities = []

          predicates.each do |node|
            if equality_only ? Arel::Nodes::Equality === node : equality_node?(node)
              equalities << node
            elsif node.is_a?(Arel::Nodes::And)
              equalities.concat equalities(node.children, equality_only)
            end
          end

          equalities
        end