ruby-on-rails - ... : wrong number of arguments (0 for 1+) 中的 gemspec 无效

Question

在我第一次尝试创建gem时，我遇到了这个错误

[rulers.gemspec] 中的 gemspec 无效:参数数量错误(0 代表 1+)

当我尝试构建它时(gem buildrules.gemspec)。

我已粘贴下面的 gemspec 文件的代码。

我哪里出错了？

# coding: utf-8
lib = File.expand_path('../lib', __FILE__)
$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
require 'rulers/version'

Gem::Specification.new do |spec|
  spec.name          = "rulers"
  spec.version       = Rulers::VERSION
  spec.authors       = ["Noffica"]
  spec.email         = ["<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="543139353d3814303b39353d3a7a373b39" rel="noreferrer noopener nofollow">[email protected]</a>"]

  spec.summary       = %q{An attempt to create a Rails-like framework...}
  spec.description   = %q{... written in Ruby.}
  spec.homepage      = ""

  # Prevent pushing this gem to RubyGems.org by setting 'allowed_push_host', or
  # delete this section to allow pushing this gem to any host.
  if spec.respond_to?(:metadata)
    spec.metadata['allowed_push_host'] = ""
  else
    raise "RubyGems 2.0 or newer is required to protect against public gem pushes."
  end

  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  spec.add_development_dependency "bundler", "~> 1.10"
  spec.add_development_dependency "rake", "~> 10.0"
  spec.add_development_dependency "rspec"

  gem.add_runtime_dependency "rack"
end

Answer 1

倒数第二行应该是

spec.add_runtime_dependency "rack"

参数是spec，而不是gem。