Ruby调试:如何找出响应的方法或变量？

在调试具有某种复杂性的ruby代码时,很容易被堆叠的方法定义和命名与局部变量的冲突混淆.

我正在寻找一种快速的方法来找出哪个方法或变量响应表达式,例如any_expression.identify.

到目前为止我能找到的最好的是:

method(:happy)
#=> #

method(:happy).source_location
#=> ["/home/somebody/project/lib/helper.rb", 9]

不幸的是,一个局部变量(如happy=42)会先于,但method(:happy)仍将返回另一个方法.

有任何想法吗？

您不必使用前缀self.class.new.如果类没有没有参数的构造函数,它将无法工作.

local_variables.include?(:foo) # local variable
method(:foo)                   # method

foo = 42
def bar; end

defined?(foo) # => "local-variable"
defined?(bar) # => "method"

在pry中,你可以使用show-method:

show-method bar # =>
  # From: (pry) @ line 104:
  # Owner: Object
  # Visibility: public
  # Number of lines: 1

  # def bar; end

而且ls:

ls foo # =>
  # Comparable#methods: between?
  # Numeric#methods: 
  #   +@      conj       imaginary     pretty_print_cycle  rectangular           
  #   abs2    conjugate  nonzero?      quo                 remainder             
  #   angle   eql?       phase         real                singleton_method_added
  #   arg     i          polar         real?               step                  
  #   coerce  imag       pretty_print  rect                to_c                  
  # Integer#methods: 
  #   ceil         downto  gcdlcm    next       pred         times   to_r    
  #   chr          floor   integer?  numerator  rationalize  to_i    truncate
  #   denominator  gcd     lcm       ord        round        to_int  upto    
  # Fixnum#methods: 
  #   %  **  -@  <<   ==   >=  ^           div     fdiv       modulo  succ  zero?
  #   &  +   /   <=   ===  >>  abs         divmod  inspect    odd?    to_f  |    
  #   *  -   <   <=>  >    []  bit_length  even?   magnitude  size    to_s  ~

Ctrl+ r:foo ==> (反向搜索)`foo =':foo = 42