使用没有Rails的RSpec在Ruby中执行TDD的过程是什么？
我需要一个Gemfile吗？它只需要rspec吗？
Ruby 1.9.3
Ruby 2.0正在添加命名参数,如下所示:
def say(greeting: 'hi')
puts greeting
end
say # => puts 'hi'
say(greeting: 'howdy') # => puts 'howdy'
如何在不提供默认值的情况下使用命名参数,以便它们是必需的？
在python中有一个pass用于定义空函数,条件,循环的关键字......对于Ruby有类似的东西吗？
Python示例:
def some_function():
# do nothing
pass
我已经使用 Ruby 3.0.0 从头开始创建了一个新的 Rails 6.1 应用程序。
我已经运行db:create并生成了一个带有一些字符串列的单个模型，后跟rails db:migrate.
我跑了rails test但是得到了这个需要 rexml 错误：
/Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require': cannot load such file -- rexml/document (LoadError)
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:332:in `block in require'
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:299:in `load_dependency'
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:332:in `require'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/selenium-webdriver-3.142.7/lib/selenium/webdriver/firefox.rb:22:in `<main>'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:332:in `block in require'
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:299:in `load_dependency'
from /Users/froop/.rvm/rubies/ruby-3.0.0/lib/ruby/gems/3.0.0/gems/activesupport-6.1.0/lib/active_support/dependencies.rb:332:in `require'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/webdrivers-4.4.1/lib/webdrivers/geckodriver.rb:72:in `<main>'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
from /Users/froop/.rvm/gems/ruby-3.0.0/gems/bootsnap-1.5.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in …Ruby on Rails 2.3.5中是否有与PHP的urlencode等效的内容？(它编码一个字符串,用于URL的查询部分)我用Google搜索,但所有答案似乎都追溯到2006年之前,似乎是日期.
这是我发现的.CGI::escape在视图中调用似乎有点不正常.
是否有等效的辅助函数？
谢谢!
这是我的阵列
[{:amount=>10, :gl_acct_id=>1, :alt_amount=>20}, {:amount=>20, :gl_acct_id=>2
, :alt_amount=>30}]
我想要结果
[{:amount => 30}] or {:amount = 30}
任何的想法？
我正在经历红宝石公案,我在151岁,我只是碰到了一堵砖墙.
这是公案:
# You need to write the triangle method in the file 'triangle.rb'
require 'triangle.rb'
class AboutTriangleProject2 < EdgeCase::Koan
# The first assignment did not talk about how to handle errors.
# Let's handle that part now.
def test_illegal_triangles_throw_exceptions
assert_raise(TriangleError) do triangle(0, 0, 0) end
assert_raise(TriangleError) do triangle(3, 4, -5) end
assert_raise(TriangleError) do triangle(1, 1, 3) end
assert_raise(TriangleError) do triangle(2, 4, 2) end
end
end
然后在triangle.rb中我们有:
def triangle(a, b, c)
# WRITE THIS CODE
if a==b && a==c
return …我有一个Ruby数组
> list = Request.find_all_by_artist("Metallica").map(&:song)
=> ["Nothing else Matters", "Enter sandman", "Enter Sandman", "Master of Puppets", "Master of Puppets", "Master of Puppets"]
我想要一个包含这样的计数的列表:
{"Nothing Else Matters" => 1,
"Enter Sandman" => 2,
"Master of Puppets" => 3}
理想情况下,我想要一个哈希,它会给我计数并注意我的方式Enter Sandman,enter sandman所以我需要它不区分大小写.我很确定我可以循环使用它但是有更清洁的方法吗？
如何在ubuntu上卸载Ruby 1.9.2dev(2010-07-02)[i486-linux]？需要重新安装 - 请帮助
无法安装特定的 ffi 版本。如果我运行 gem install ffi，一切正常，但我需要特定版本 1.9.18 并且它不起作用。
Fetching ffi 1.9.18
Installing ffi 1.9.18 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /Users/chille/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/ffi-
1.9.18/ext/ffi_c
/Users/chille/.rbenv/versions/2.6.5/bin/ruby -I
/Users/chille/.rbenv/versions/2.6.5/lib/ruby/2.6.0 -r
./siteconf20200928-22154-72wopi.rb extconf.rb
checking for ffi_call() in -lffi... yes
checking for ffi_prep_closure()... yes
checking for ffi_raw_call()... yes
checking for ffi_prep_raw_closure()... yes
checking for shlwapi.h... no
checking for rb_thread_blocking_region()... no
checking for rb_thread_call_with_gvl()... yes
checking for rb_thread_call_without_gvl()... yes
checking for ffi_prep_cif_var()... yes
creating extconf.h
creating Makefile
current directory: /Users/chille/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/ffi- …