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ruby - 在 irb 中定义一个名为 'method' 的方法时，出现了错误的参数数量

问题描述

在 irb/gry 中定义一个名为“method”的方法之后

def method
    puts 1
end

 Traceback (most recent call last):
        33: from F:/Ruby27-x64/bin/irb.cmd:31:in `<main>'
        32: from F:/Ruby27-x64/bin/irb.cmd:31:in `load'
        31: from F:/Ruby27-x64/lib/ruby/gems/2.7.0/gems/irb-1.2.3/exe/irb:11:in `<top (required)>'
        30: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:399:in `start'
        29: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:470:in `run'
        28: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:470:in `catch'
        27: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:471:in `block in run'
        26: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:536:in `eval_input'
        25: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `each_top_level_statement'
        24: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:134:in `catch'
        23: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `block in each_top_level_statement'
        22: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:135:in `loop'
        21: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:138:in `block (2 levels) in each_top_level_statement'
        20: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/ruby-lex.rb:166:in `lex'
        19: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:517:in `block in eval_input'
        18: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:695:in `signal_status'
        17: from F:/Ruby27-x64/lib/ruby/2.7.0/irb.rb:518:in `block (2 levels) in eval_input'
        16: from F:/Ruby27-x64/lib/ruby/2.7.0/irb/input-method.rb:262:in `gets'
        15: from F:/Ruby27-x64/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
        14: from F:/Ruby27-x64/lib/ruby/2.7.0/forwardable.rb:235:in `readmultiline'
        13: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:174:in `readmultiline'
        12: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:236:in `inner_readline'
        11: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:236:in `loop'
        10: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:237:in `block in inner_readline'
         9: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:266:in `read_io'
         8: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:266:in `loop'
         7: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:307:in `block in read_io'
         6: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:238:in `block (2 levels) in inner_readline'
         5: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:238:in `each'
         4: from F:/Ruby27-x64/lib/ruby/2.7.0/reline.rb:239:in `block (3 levels) in inner_readline'
         3: from F:/Ruby27-x64/lib/ruby/2.7.0/reline/line_editor.rb:837:in `input_key'
         2: from F:/Ruby27-x64/lib/ruby/2.7.0/reline/line_editor.rb:795:in `normal_char'
         1: from F:/Ruby27-x64/lib/ruby/2.7.0/reline/line_editor.rb:721:in `process_key'
(irb):1:in `method': wrong number of arguments (given 1, expected 0) (ArgumentError)

但是如果我更改它的名称，则错误已修复

更改名称后，它运行正确

更改名称后，它运行正确

我认为这个错误的原因是 ruby​​ 中的方法名称不能是“方法”，但是在我在RubyMine 2020.2中尝试过之后，它运行正确，我很困惑。

在 RubyMine 中 在 RubyMine 中

标签： rubyirb

解决方案

您正在覆盖该Object#method方法。覆盖核心 Ruby 方法绝不是一个好主意。

特别是，IRb 和 Pry 都支持在您键入时自动完成，它们支持文档和许多其他内容。猜猜他们使用什么方法来获取Method可以使用的对象？

因此，正在发生的事情是 IRb 正在调用method(some_method_name)以访问某些方法，但是您已经用Object#method不带参数的方法覆盖了该方法。

不要乱用 Ruby 的核心方法。如果你正在使用 IRb，尤其是不要乱用 IRb 使用的核心方法。

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