class RuboCop::Cop::Style::NestedTernaryOperator

This cop checks for nested ternary op expressions.

def on_if(node) 

def on_if(node)
  return unless node.ternary?
  node.each_descendant(:if).select(&:ternary?).each do |nested_ternary|
    add_offense(nested_ternary, :expression)
  end
end