带参数的 Ruby DSL define_method

Question

这就是我想要做的。

# DSL Commands
command :foo, :name, :age
command :bar, :name

# Defines methods
def foo(name, age)
  # Do something
end

def bar(name)
  # Do something
end

基本上，我需要一种通过 define_method 处理参数的方法，但我想要定义数量的参数而不是 arg 数组(即 *args)

这是我目前的情况

def command(method, *args)
  define_method(method) do |*args|
    # Do something
  end
end

# Which would produce
def foo(*args)
  # Do something
end

def bar(*args)
  # Do something
end

想法？

Answer 1

我认为最好的解决方法是执行以下操作:

def command(method, *names)
  count = names.length
  define_method(method) do |*args|

    raise ArgumentError.new(
      "wrong number of arguments (#{args.length} for #{count})"
    ) unless args.length == count

    # Do something
  end
end