https://github.com/rest-client/rest-client
1) Add new gem to Gemfile, then bundle install
gem ‘rest-client’, ‘~> 2.0.2′
2) Use rails console to test new gem
irb(main):001:0> url = “http://www.weather.com.cn/data/sk/101190408.html”
=> “http://www.weather.com.cn/data/sk/101190408.html”
irb(main):002:0> safeurl = URI.encode(url.strip)
=> “http://www.weather.com.cn/data/sk/101190408.html”
irb(main):003:0> response = RestClient.get(safeurl)
=> <RestClient::Response 200 “{\”weatherin…”>
irb(main):004:0> url_hash = JSON.parse(response.body)
=> {“weatherinfo”=>{“city”=>”太仓”, “cityid”=>”101190408″, “temp”=>”22.8″, “WD”=>”东风”, “WS”=>”小于3级”, “SD”=>”81%”, “AP”=>”1005.5hPa”, “njd”=>”暂无实况”, “WSE”=>”<3″, “time”=>”17:55″, “sm”=>”3.2″, “isRadar”=>”0″, “Radar”=>””}}
irb(main):005:0> response.code
=> 200
Gem::Ext::BuildError: ERROR: Failed to build gem native extension. /Users/angela/.rbenv/versions/1.9.3-p545/bin/ruby -r ./siteconf20170106-59264-robjdg.rb extconf.rb --use-system-libraries checking if the C compiler accepts ... yes checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no Building nokogiri using system libraries. libxml2 version 2.6.21 or later is required! *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/Users/angela/.rbenv/versions/1.9.3-p545/bin/ruby --help --clean --use-system-libraries --with-zlib-dir --without-zlib-dir --with-zlib-include --without-zlib-include=${zlib-dir}/include --with-zlib-lib --without-zlib-lib=${zlib-dir}/lib --with-xml2-dir --without-xml2-dir --with-xml2-include --without-xml2-include=${xml2-dir}/include --with-xml2-lib --without-xml2-lib=${xml2-dir}/lib --with-libxml-2.0-config --without-libxml-2.0-config --with-pkg-config --without-pkg-config --with-xslt-dir --without-xslt-dir --with-xslt-include --without-xslt-include=${xslt-dir}/include --with-xslt-lib --without-xslt-lib=${xslt-dir}/lib --with-libxslt-config --without-libxslt-config --with-exslt-dir --without-exslt-dir --with-exslt-include --without-exslt-include=${exslt-dir}/include --with-exslt-lib --without-exslt-lib=${exslt-dir}/lib --with-libexslt-config --without-libexslt-config extconf failed, exit code 1 Gem files will remain installed in /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/nokogiri-1.6.7.2 for inspection. Results logged to /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/extensions/x86_64-darwin-13/1.9.1-static/nokogiri-1.6.7.2/gem_make.out /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:89:in `run' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/ext_conf_builder.rb:36:in `block in build' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/1.9.1/tempfile.rb:320:in `open' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/ext_conf_builder.rb:19:in `build' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:161:in `block (2 levels) in build_extension' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:160:in `chdir' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:160:in `block in build_extension' <internal:prelude>:10:in `synchronize' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:159:in `build_extension' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:198:in `block in build_extensions' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:195:in `each' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:195:in `build_extensions' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:702:in `build_extensions' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:250:in `install' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/source/rubygems.rb:90:in `block in install' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/rubygems_integration.rb:130:in `preserve_paths' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/source/rubygems.rb:89:in `install' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:105:in `block in install_gem_from_spec' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/rubygems_integration.rb:162:in `with_build_args' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:104:in `install_gem_from_spec' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:262:in `block in install_sequentially' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/1.9.1/forwardable.rb:201:in `each' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/1.9.1/forwardable.rb:201:in `each' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:261:in `install_sequentially' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:91:in `run' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/installer.rb:15:in `install' /Users/angela/.rbenv/rbenv.d/exec/gem-rehash/rubygems_plugin.rb:27:in `install' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/cli/install.rb:78:in `run' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/cli.rb:145:in `install' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/vendor/thor/command.rb:27:in `run' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/vendor/thor/invocation.rb:121:in `invoke_command' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/vendor/thor.rb:363:in `dispatch' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/vendor/thor/base.rb:440:in `start' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/cli.rb:9:in `start' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/bin/bundle:20:in `block in <top (required)>' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/lib/bundler/friendly_errors.rb:5:in `with_friendly_errors' /Users/angela/.rbenv/versions/1.9.3-p545/lib/ruby/gems/1.9.1/gems/bundler-1.6.5/bin/bundle:18:in `<top (required)>' /Users/angela/.rbenv/versions/1.9.3-p545/bin/bundle:23:in `load' /Users/angela/.rbenv/versions/1.9.3-p545/bin/bundle:23:in `<main>' An error occurred while installing nokogiri (1.6.7.2), and Bundler cannot continue. Make sure that `gem install nokogiri -v '1.6.7.2'` succeeds before bundling.
解决方法
brew install --force libxml2 libxslt brew install --force libiconv xcode-select --install
需要添加gem， gem rails_config
$ EDITOR=vim bundle open devise
$ vim
$ echo $EDITOR
$ vim ~/.bashrc
加上这句 export EDITOR=vim
$ . ~/.bashrc
$ echo $EDITOR
vim
$ bundle open devise
Gem::InstallError: net-ssh requires Ruby version >= 2.0
修改Gemfile,变一下版本
gem 'unicorn' group :test, :development do gem "rspec-rails", ">= 2.5.0" gem 'factory_girl', '2.6.4' gem 'factory_girl_rails', '1.7.0' gem 'faker', '1.1.2' gem 'forgery', '0.5.0' gem 'magic_encoding', '0.0.2' gem 'email_spec', '1.4.0' gem 'net-ssh', '~> 2.0' gem 'capistrano', '~> 2.15.7' gem 'capistrano-rbenv', '1.0.5' gem 'rb-readline','0.4.2' end
https://github.com/activerecord-hackery/ransack
添加Gemfile
gem 'ransack'
view中代码
<%= form_tag products_path, method: :get, class: "navbar-form navbar-left" do %> <div class="form-group"> <%= search_field_tag("q[name_cont]", params["q"] && params["q"]["name_cont"], class:"form-control input-sm search-form", placeholder: "输入商品名称")%> </div> <% end %>
controller里
def index @q = Product.ransack(params[:q]) @products = @q.result(distinct: true) end
其中 name_cont会对name字段进行模糊查询
http://stackoverflow.com/questions/5286117/incompatible-character-encodings-ascii-8bit-and-utf-8
http://stackoverflow.com/questions/22932282/gemloaderror-specified-mysql2-for-database-adapter-but-the-gem-is-not-loade
这个是因为在Gemfile和database.yml里写的都是mysql,
应该是mysql2.
修改之后报出新错误：“
Gem::LoadError Specified ‘mysql2′ for database adapter, but the gem is not loaded. Add `gem ‘mysql2’` to your Gemfile
”
配置一下mysql2 的版本
If you have this error when upgrading to rails 4.2.4 (also with rails 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'https://rubygems.org/
今天看到了如下的提示:
Warning: You’re using Rubygems 1.8.23.2 with Spring. Upgrate to at least Rubygems 2.1.0 and run Rails 4.1.4
$gem update –system
update to the latest RubyGems version