{"id":2885,"date":"2021-11-16T22:35:18","date_gmt":"2021-11-16T13:35:18","guid":{"rendered":"https:\/\/suzutukiblog.com\/?p=2885"},"modified":"2022-01-22T05:41:49","modified_gmt":"2022-01-21T20:41:49","slug":"rails-tutorial-4","status":"publish","type":"post","link":"https:\/\/suzutukiblog.com\/index.php\/2021\/11\/16\/rails-tutorial-4\/","title":{"rendered":"Rails-tutorial\u81ea\u5206\u7528\u307e\u3068\u3081(4\u7ae0 Ruby )"},"content":{"rendered":"

\u305d\u306e\uff13\u304b\u3089\u7d9a\u304f<\/a><\/h3>\n

4\u7ae0Rails\u98a8\u5473\u306eRuby<\/h3>\n

4.1.1\u00a0<\/span>\u7d44\u307f\u8fbc\u307f\u30d8\u30eb\u30d1\u30fc<\/h3>\n
\u30b5\u30f3\u30d7\u30eb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30ec\u30a4\u30a2\u30a6\u30c8<\/span><\/div>\n
app\/views\/layouts\/application.html.erb<\/strong><\/code><\/span><\/div>\n
\n
\n
<!DOCTYPE html><\/span>\r\n<<\/span>html<\/span>><\/span>\r\n  <<\/span>head<\/span>><\/span>\r\n    <<\/span>title<\/span>><\/span><%=<\/span> yield<\/span>(<\/span>:title<\/span>)<\/span> %><\/span> | Ruby on Rails Tutorial Sample App<\/<\/span>title<\/span>><\/span>\r\n    <%=<\/span> csrf_meta_tags<\/span> %><\/span>\r\n    <%=<\/span> stylesheet_link_tag<\/span>    'application'<\/span>,<\/span> media<\/span>:<\/span> 'all'<\/span>,<\/span>\r\n        'data-turbolinks-track'<\/span>:<\/span> 'reload'<\/span> %><\/span>\r\n    <%=<\/span> javascript_include_tag<\/span> 'application'<\/span>,<\/span>\r\n        'data-turbolinks-track'<\/span>:<\/span> 'reload'<\/span> %><\/span>\r\n  <\/<\/span>head<\/span>><\/span>\r\n  <<\/span>body<\/span>><\/span>\r\n    <%=<\/span> yield<\/span> %><\/span>\r\n  <\/<\/span>body<\/span>><\/span>\r\n<\/<\/span>html<\/span>><\/span><\/strong><\/pre>\n<\/div>\n<\/div>\n
stylesheet_link_tag<\/code><\/strong>\u00a0(\u8a73\u7d30\u306fRails API\u53c2\u7167) \u3092\u4f7f\u3063\u3066\u3001application.css<\/code><\/strong>\u3092\u3059\u3079\u3066\u306e\u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7\u3067\u4f7f\u3048\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059<\/p>\n
4.1.2\u00a0<\/span>\u30ab\u30b9\u30bf\u30e0\u30d8\u30eb\u30d1\u30fc<\/h3>\n
\u65b0\u3057\u304f\u4f5c\u3063\u305f\u30e1\u30bd\u30c3\u30c9\u306f\u30ab\u30b9\u30bf\u30e0\u30d8\u30eb\u30d1\u30fc<\/em><\/strong><\/p>\n
\n
\n
<%=<\/span> yield<\/span>(<\/span>:title<\/span>)<\/span> %><\/span> | Ruby on Rails Tutorial Sample App\r\n<\/strong><\/pre>\n
<%<\/span> provide<\/span>(<\/span>:title<\/span>,<\/span> \"Home\"<\/span>)<\/span> %><\/span>\r\n<<\/span>h1<\/span>><\/span>Sample App<\/<\/span>h1<\/span>><\/span>\r\n<<\/span>p<\/span>><\/span>\r\n  This is the home page for the\r\n  <<\/span>a<\/span> href<\/span>=<\/span>\"https:\/\/railstutorial.jp\/\"<\/span>><\/span>Ruby on Rails Tutorial<\/<\/span>a<\/span>><\/span>\r\n  sample application.\r\n<\/<\/span>p<\/span>><\/span><\/strong><\/pre>\n
full_title<\/code>\u3068\u3044\u3046\u30d8\u30eb\u30d1\u30fc\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n
full_title<\/code>\u30d8\u30eb\u30d1\u30fc\u3092\u5b9a\u7fa9\u3059\u308bapp\/helpers\/application_helper.rb<\/code><\/strong><\/span><\/div>\n
\n
\n
module<\/span> ApplicationHelper<\/span>\r\n\r\n  # \u30da\u30fc\u30b8\u3054\u3068\u306e\u5b8c\u5168\u306a\u30bf\u30a4\u30c8\u30eb\u3092\u8fd4\u3057\u307e\u3059\u3002<\/span>\r\n  def<\/span> full_title<\/span>(<\/span>page_title<\/span> =<\/span> ''<\/span>)<\/span>\r\n    base_title<\/span> =<\/span> \"Ruby on Rails Tutorial Sample App\"<\/span>\r\n    if<\/span> page_title<\/span>.<\/span>empty?<\/span>\r\n      base_title<\/span>\r\n    else<\/span>\r\n      page_title<\/span> +<\/span> \" | \"<\/span> +<\/span> base_title<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\nend<\/span><\/strong><\/pre>\n
<<\/span>title<\/span>><\/span><%=<\/span> yield<\/span>(<\/span>:title<\/span>)<\/span> %><\/span> | Ruby on Rails Tutorial Sample App<\/<\/span>title<\/span>>\r\n<\/span><<\/span>title<\/span>><\/span><%=<\/span> full_title<\/span>(<\/span>yield<\/span>(<\/span>:title<\/span>))<\/span> %><\/span><\/<\/span>title<\/span>><\/span><\/strong><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
<\/div>\n
<\/p>\n
<\/div>\n
\n
\n
\n
full_title\u30d8\u30eb\u30d1\u30fc\u3092\u4f7f\u3063\u305fWeb\u30b5\u30a4\u30c8\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u00a0green<\/strong><\/span><\/span><\/h3>\n
<\/div>\n
app\/views\/layouts\/application.html.erb<\/code><\/span><\/strong><\/div>\n
\n
\n
<!DOCTYPE html><\/span>\r\n<<\/span>html<\/span>><\/span>\r\n  <<\/span>head<\/span>><\/span>\r\n<<\/span>title<\/span>><\/span><%=<\/span> full_title<\/span>(<\/span>yield<\/span>(<\/span>:title<\/span>))<\/span> %><\/span><\/<\/span>title<\/span>><\/span><\/span>    <%=<\/span> csrf_meta_tags<\/span> %><\/span>\r\n    <%=<\/span> stylesheet_link_tag<\/span>    'application'<\/span>,<\/span> media<\/span>:<\/span> 'all'<\/span>,<\/span>\r\n                               'data-turbolinks-track'<\/span>:<\/span> 'reload'<\/span> %><\/span>\r\n    <%=<\/span> javascript_include_tag<\/span> 'application'<\/span>,<\/span>\r\n                               'data-turbolinks-track'<\/span>:<\/span> 'reload'<\/span> %><\/span>\r\n  <\/<\/span>head<\/span>><\/span>\r\n  <<\/span>body<\/span>><\/span>\r\n    <%=<\/span> yield<\/span> %><\/span>\r\n  <\/<\/span>body<\/span>><\/span>\r\n<\/<\/span>html<\/span>><\/span><\/strong><\/pre>\n<\/div>\n
\u00a0Home\u30da\u30fc\u30b8\u306e\u30bf\u30a4\u30c8\u30eb\u78ba\u8a8d\u7528\u306b\u30c6\u30b9\u30c8\u3092\u66f4\u65b0\u3059\u308b\u00a0red<\/strong><\/span><\/span><\/h3>\n
<\/div>\n
test\/controllers\/static_pages_controller_test.rb<\/code><\/span><\/strong><\/div>\n
\n
\n
require<\/span> 'test_helper'<\/span>\r\n\r\nclass<\/span> StaticPagesControllerTest<\/span> <<\/span> ActionDispatch<\/span>::<\/span>IntegrationTest<\/span>\r\n  test<\/span> \"should get home\"<\/span> do<\/span>\r\n    get<\/span> static_pages_home_url<\/span>\r\n    assert_response<\/span> :success<\/span>\r\nassert_select<\/span> \"title\"<\/span>,<\/span> \"Ruby on Rails Tutorial Sample App\"<\/span><\/span>  end<\/span>\r\n\r\n  test<\/span> \"should get help\"<\/span> do<\/span>\r\n    get<\/span> static_pages_help_url<\/span>\r\n    assert_response<\/span> :success<\/span>\r\n    assert_select<\/span> \"title\"<\/span>,<\/span> \"Help | Ruby on Rails Tutorial Sample App\"<\/span>\r\n  end<\/span>\r\n\r\n  test<\/span> \"should get about\"<\/span> do<\/span>\r\n    get<\/span> static_pages_about_url<\/span>\r\n    assert_response<\/span> :success<\/span>\r\n    assert_select<\/span> \"title\"<\/span>,<\/span> \"About | Ruby on Rails Tutorial Sample App\"<\/span>\r\n  end<\/span>\r\nend<\/span><\/strong><\/pre>\n
rails test<\/strong>\r\n3 tests, 6 assertions, 1 failures, 0 errors, 0 skips<\/pre>\n<\/div>\n
\u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u305b\u305a\u306b\u8868\u793a\u3059\u308bHome\u30da\u30fc\u30b8\u00a0green<\/strong><\/span><\/span><\/h3>\n
app\/views\/static_pages\/home.html.erb<\/code><\/span><\/strong><\/div>\n
\n
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<<\/span>h1<\/span>><\/span>Sample App<\/<\/span>h1<\/span>><\/span>\r\n<<\/span>p<\/span>><\/span>\r\n  This is the home page for the\r\n  <<\/span>a<\/span> href<\/span>=<\/span>\"https:\/\/railstutorial.jp\/\"<\/span>><\/span>Ruby on Rails Tutorial<\/<\/span>a<\/span>><\/span>\r\n  sample application.\r\n<\/<\/span>p<\/span>>\r\n<\/span><\/strong><\/pre>\n<\/div>\n
\n
\n
irb\u3092\u4f7f\u3046\u305f\u3081\u306e\u6e96\u5099\r\n<\/span>nano ~\/.irbrc<\/pre>\n
irb\u306e\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3092\u8ffd\u52a0\u3059\u308b ~\/.irbrc<\/code><\/span><\/h3>\n
\n
\n
IRB<\/span>.<\/span>conf<\/span>[<\/span>:PROMPT_MODE<\/span>]<\/span> =<\/span> :SIMPLE\r\n<\/span>IRB<\/span>.<\/span>conf<\/span>[<\/span>:AUTO_INDENT_MODE<\/span>]<\/span> =<\/span> fals\r\n<\/span><\/pre>\n<\/div>\n<\/div>\n
4.2.2\u00a0<\/span>\u6587\u5b57\u5217<\/h3>\n
rails console<\/span>\r\n>> <\/span>\"\"<\/span>         # \u7a7a\u306e\u6587\u5b57\u5217<\/span>\r\n=> \"\"<\/span>\r\n>> <\/span>\"foo\"<\/span>      # \u7a7a\u3067\u306f\u306a\u3044\u6587\u5b57\u5217<\/span>\r\n=> \"foo\"\r\n<\/span>\"foo\"<\/span> +<\/span> \"bar\"<\/span>    # \u6587\u5b57\u5217\u306e\u7d50\u5408<\/span>\r\n=> \"foobar\"<\/span><\/strong><\/pre>\n
\u5f0f\u5c55\u958b (interpolation)\u00a0<\/strong><\/p>\n
first_name<\/span> =<\/span> \"Michael\"<\/span>    # \u5909\u6570\u306e\u4ee3\u5165<\/span>\r\n=> \"Michael\"<\/span>\r\n>> <\/span>\"<\/span>#{<\/span>first_name<\/span>}<\/span> Hartl\"<\/span>     # \u6587\u5b57\u5217\u306e\u5f0f\u5c55\u958b<\/span>\r\n=> \"Michael Hartl\"<\/span><\/strong><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\u6587\u5b57\u5217\u3092\u7d44\u307f\u7acb\u3066\u308b\u4ed6\u306e\u65b9\u6cd5\u3068\u3057\u3066\u5f0f\u5c55\u958b (interpolation)
\n\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u3001#{}\u3068\u3044\u3046\u7279\u6b8a\u306a\u69cb\u6587\u3092\u4f7f\u3046\u3088<\/p>\n
=> \"Michael Hartl\"<\/strong>\r\n>> first_name = \"Michael\"<\/strong>\r\n=> \"Michael\"<\/strong>\r\n>> last_name = \"Hartl\"<\/strong>\r\n=> \"Hartl\"<\/strong>\r\n>> first_name + \" \" + last_name<\/strong>\r\n=> \"Michael Hartl\"<\/strong>\r\n>> \"#{first_name} #{last_name}\"<\/strong>\r\n=> \"Michael Hartl\"<\/strong><\/pre>\n
first_name<\/code><\/strong>\u5909\u6570\u306b\u4ee3\u5165 (assign)\u3057\u3001\u3053\u306e\u5909\u6570\u3092\u00a0\"#{first_name} Hartl\"<\/code><\/strong><\/p>\n
\u3068\u3044\u3046\u5f62\u3067\u6587\u5b57\u5217\u306e\u4e2d\u306b\u57cb\u3081\u8fbc\u3080\u3068\u3001\u6587\u5b57\u5217\u306e\u4e2d\u3067\u305d\u306e\u5909\u6570\u304c\u5c55\u958b\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
first_name<\/span> =<\/span> \"Michael\"<\/span>\r\n=> \"Michael\"<\/span>\r\n>> <\/span>last_name<\/span> =<\/span> \"Hartl\"<\/span>\r\n=> \"Hartl\"<\/span>\r\n>> <\/span>first_name<\/span> +<\/span> \" \"<\/span> +<\/span> last_name<\/span>    # \u82d7\u5b57\u3068\u540d\u524d\u306e\u9593\u306b\u7a7a\u767d\u3092\u5165\u308c\u305f\u7d50\u5408<\/span>\r\n=> \"Michael Hartl\"<\/span>\r\n>> <\/span>\"<\/span>#{<\/span>first_name<\/span>}<\/span> #{<\/span>last_name<\/span>}<\/span>\"<\/span>    # \u5f0f\u5c55\u958b\u3092\u4f7f\u3063\u3066\u7d50\u5408 (\u4e0a\u3068\u5168\u304f\u540c\u3058)<\/span>\r\n=> \"Michael Hartl\"<\/span><\/strong><\/pre>\n
\u6700\u5f8c\u306e2\u3064\u306e\u7d50\u679c\u306f\u3001\u5168\u304f\u540c\u3058\u7d50\u679c(\u7b49\u4fa1\u3068\u3044\u3046)<\/p>\n
Ruby\u306f\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u6587\u5b57\u5217\u306e\u4e2d\u3067\u306f\u5f0f\u5c55\u958b\u3092\u884c\u3044\u307e\u305b\u3093\u3002<\/p>\n
>> '#{first_name}'<\/strong>\r\n=> \"\\#{first_name}\"<\/strong>\r\n>> \"#{first_name}\"<\/strong>\r\n=> \"Michael\"<\/strong><\/pre>\n
\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8\u6587\u5b57\u5217\u3092\u7528\u3044\u305f\u6587\u5b57\u5217\u3067#\u306e\u3088\u3046\u306a\u7279\u6b8a\u306a\u6587\u5b57\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u3001
\n\u3053\u306e\u6587\u5b57\u3092\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u3067\u30a8\u30b9\u30b1\u30fc\u30d7 (escape) \u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
>> \"\\#{first_name}\" \u00d7<\/strong>\r\n=> \"\\#{first_name}\"<\/strong>\r\n>> \"\\##{first_name}\"\u25cb<\/strong>\r\n=> \"#Michael\"<\/strong><\/pre>\n
\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u306f\u3001\u5165\u529b\u3057\u305f\u6587\u5b57\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\u305b\u305a\u306b\u300c\u305d\u306e\u307e\u307e\u300d
\n\u4fdd\u6301\u3059\u308b\u3068\u304d\u306b\u4fbf\u5229\u3002
\n\u300c\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u300d\u306e\u6587\u5b57\u306f\u3001\u6539\u884c\u6587\u5b57\\n\u3068\u540c\u69d8\u306b\u591a\u304f\u306e\u30b7\u30b9\u30c6\u30e0\u4e0a\u3067\u3001\u7279\u6b8a\u306a\u6587\u5b57\u3068\u3057\u3066\u6271\u308f\u308c\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u3067\u6587\u5b57\u5217\u3092\u56f2\u3081\u3070\u3001\u7c21\u5358\u306b\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u6587\u5b57\u306e
\n\u3088\u3046\u306a\u7279\u6b8a\u6587\u5b57\u3092\u305d\u306e\u307e\u307e\u5909\u6570\u306b\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3002<\/p>\n
>> '\\n'<\/strong>\r\n=> \"\\\\n\"<\/strong><\/pre>\n
#{\u6587\u5b57\u3068\u540c\u69d8\u3001Ruby\u3067\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u305d\u306e\u3082\u306e\u3092\u30a8\u30b9\u30b1\u30fc\u30d7\u3059\u308b\u5834\u5408\u306f\u3001
\n\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u304c\u3082\u30461\u3064\u5fc5\u8981\u3067\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8\u6587\u5b57\u5217\u306e\u4e2d\u3067\u306f\u3001
\n\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u6587\u5b57\u305d\u306e\u3082\u306e\u306f2\u3064\u306e\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u306b\u3088\u3063\u3066\u8868\u3055\u308c
\n\u6b21\u306e\u3088\u3046\u306b\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u5fc5\u8981\u306a\u6587\u5b57\u304c\u5927\u91cf\u306b\u3042\u308b\u5834\u5408\u306b\u306f\u3001
\n\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u306f\u975e\u5e38\u306b\u4fbf\u5229\u3002<\/p>\n
>> 'Newlines (\\n) and tabs (\\t) both use the backslash<\/strong>\r\ncharacter \\.'<\/strong>\r\n=> \"Newlines (\\\\n) and tabs (\\\\t) both use the backslash<\/strong>\r\ncharacter \\\\.\"<\/strong><\/pre>\n
\u6f14\u7fd2<\/h2>\n
1:city\u5909\u6570\u306b\u9069\u5f53\u306a\u5e02\u533a\u753a\u6751\u3092\u3001prefecture\u5909\u6570\u306b\u9069\u5f53\u306a\u90fd\u9053\u5e9c\u770c\u3092
\n\u4ee3\u5165\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
city = 'iga'<\/strong>\r\nprefecture = 'mie'<\/strong><\/pre>\n
2:\u5148\u307b\u3069\u4f5c\u3063\u305f\u5909\u6570\u3068\u5f0f\u5c55\u958b\u3092\u4f7f\u3063\u3066\u3001\u300c\u6771\u4eac\u90fd\u65b0\u5bbf\u533a\u300d\u306e\u3088\u3046\u306a
\n\u4f4f\u6240\u306e\u6587\u5b57\u5217\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u51fa\u529b\u306b\u306fputs\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
\"#{prefecture}\u770c #{city}\u5e02\"<\/strong>\r\n=> \"mie\u770c iga\u5e02\"<\/strong><\/pre>\n
3:\u4e0a\u8a18\u306e\u6587\u5b57\u5217\u306e\u9593\u306b\u3042\u308b\u534a\u89d2\u30b9\u30da\u30fc\u30b9\u3092\u30bf\u30d6\u306b\u7f6e\u304d\u63db\u3048\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002
\n(\u30d2\u30f3\u30c8: \u6539\u884c\u6587\u5b57\u3068\u540c\u3058\u3067\u3001\u30bf\u30d6\u3082\u7279\u6b8a\u6587\u5b57\u3067\u3059)<\/h3>\n
puts \"#{prefecture}\u770c \\t #{city}<\/strong>\r\nmie\u770c iga\u5e02<\/strong><\/pre>\n
4:\u30bf\u30d6\u306b\u7f6e\u304d\u63db\u3048\u305f\u6587\u5b57\u5217\u3092\u3001\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8\u304b\u3089\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u306b
\n\u7f6e\u304d\u63db\u3048\u3066\u307f\u308b\u3068\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b?<\/h3>\n
puts '#{prefecture}\u770c \\t #{city}\u5e02'<\/strong>\r\n#{prefecture}\u770c \\t #{city}\u5e02<\/strong><\/pre>\n
4.2.3 <\/span>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u30e1\u30c3\u30bb\u30fc\u30b8\u53d7\u3051\u6e21\u3057<\/h3>\n
Ruby\u3067\u306f\u3001\u3042\u3089\u3086\u308b\u3082\u306e\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u6587\u5b57\u5217\u3084nil\u3067\u3059\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306f (\u3044\u3064\u3044\u304b\u306a\u308b\u5834\u5408\u306b\u3082) \u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u5fdc\u7b54\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u4f8b\u3048\u3070length<\/code><\/strong>\u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u5fdc\u7b54\u3067\u304d\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u6587\u5b57\u5217\u306e\u6587\u5b57\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\"foobar\"<\/span>.<\/span>length<\/span>        # \u6587\u5b57\u5217\u306b \"length\" \u3068\u3044\u3046\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u308b<\/span>\r\n=> 6<\/span><\/strong><\/pre>\n
\"foobar\"<\/span>.<\/span>empty?<\/span>\r\n=> false<\/span>\r\n>> <\/span>\"\"<\/span>.<\/span>empty?<\/span>\r\n=> true<\/span><\/strong><\/pre>\n
> first_name = “Michael” # \u5909\u6570\u306e\u4ee3\u5165<\/strong>
\n=> “Michael”<\/strong>
\n>> “#{first_name} Hartl” # \u6587\u5b57\u5217\u306e\u5f0f\u5c55\u958b<\/strong>
\n=> “Michael Hartl”<\/strong><\/p>\n
\u300c!!\u300d(\u300c\u30d0\u30f3\u30d0\u30f3 (bang bang)\u300d\u3068\u8aad\u307f\u307e\u3059) \u3068\u3044\u3046\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3068\u3001
\n\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30922\u56de\u5426\u5b9a\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3001\u3069\u3093\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3082
\n\u5f37\u5236\u7684\u306b\u8ad6\u7406\u5024\u306b\u5909\u63db\u3067\u304d\u307e\u3059<\/p>\n
!!nil => false<\/strong><\/pre>\n
\u305d\u306e\u4ed6\u306e\u3042\u3089\u3086\u308bRuby\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30bc\u30ed\u3067\u3059\u3089true\u3067\u3059\u3002<\/p>\n
>> !!0 => true<\/strong><\/pre>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u6e21\u3055\u308c\u308b\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3001\u4e00\u822c\u306b\u306f\u30e1\u30bd\u30c3\u30c9\u3068\u547c\u3070\u308c
\n\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u4f53\u306f\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u3067\u3059
\n\u30e1\u30bd\u30c3\u30c9\u3092\u30c1\u30a7\u30fc\u30f3(chain)\u3057\u3066\u6e21\u305b\u307e\u3059\u3002<\/p>\n
nil.to_s.empty? # \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306e\u4f8b<\/strong>\r\n=> true<\/strong><\/pre>\n
\u51fa\u529b<\/h4>\n
puts<\/span> \"foo\"<\/span>     # \u6587\u5b57\u5217\u3092\u51fa\u529b\u3059\u308b<\/span>\r\nfoo<\/span>\r\n=> nil<\/span><\/strong><\/pre>\n
print<\/span> \"foo\"<\/span>    # \u6587\u5b57\u5217\u306e\u753b\u9762\u51fa\u529b (puts\u3068\u540c\u3058\u3060\u304c\u6539\u884c\u304c\u306a\u3044)<\/span>\r\nfoo=> nil<\/span><\/strong><\/pre>\n
\u610f\u56f3\u7684\u306b\u6539\u884c\u3092\u8ffd\u52a0\u3057\u305f\u3044\u3068\u304d\u306f\u3001
\n\u300c\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5 (\\<\/code>) + n\u300d(\u00a0\\n<\/code>) \u3068\u3044\u3046\u6539\u884c\u6587\u5b57\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n
print<\/span> \"foo<\/span>\\n<\/span>\"<\/span>  # puts \"foo\" \u3068\u7b49\u4fa1<\/span>\r\nfoo<\/span>\r\n=> nil<\/span><\/strong><\/pre>\n
\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u5185\u306e\u6587\u5b57\u5217<\/h4>\n
'foo'<\/span>          # \u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u306e\u6587\u5b57\u5217<\/span>\r\n=> \"foo\"<\/span>\r\n>> <\/span>'foo'<\/span> +<\/span> 'bar'<\/span>\r\n=> \"foobar\"<\/span><\/strong><\/pre>\n
Ruby\u306f\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u6587\u5b57\u5217\u306e\u4e2d\u3067\u306f\u5f0f\u5c55\u958b\u3092\u884c\u3044\u307e\u305b\u3093\u3002<\/h4>\n
'#{foo} bar'<\/span>     # \u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8\u5185\u306e\u6587\u5b57\u5217\u3067\u306f\u5f0f\u5c55\u958b\u304c\u3067\u304d\u306a\u3044<\/span>\r\n=> \"\\#{foo} bar\"<\/span><\/strong><\/pre>\n
#<\/code>\u306e\u3088\u3046\u306a\u7279\u6b8a\u306a\u6587\u5b57\u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u3001\u3053\u306e\u6587\u5b57\u3092\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u3067\u30a8\u30b9\u30b1\u30fc\u30d7 (escape)\u00a0<\/strong><\/p>\n
\u6f14\u7fd2<\/h2>\n
1:”racecar” \u306e\u6587\u5b57\u5217\u306e\u9577\u3055\u306f\u3044\u304f\u3064\u3067\u3059\u304b? length\u30e1\u30bd\u30c3\u30c9\u3092
\n\u4f7f\u3063\u3066\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
\"racecar\".length => 7<\/strong><\/pre>\n
2:reverse\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001”racecar”\u306e\u6587\u5b57\u5217\u3092\u9006\u304b\u3089\u8aad\u3080\u3068
\n\u3069\u3046\u306a\u308b\u304b\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
\"racecar\".reverse => \"racecar\"<\/strong><\/pre>\n
3:\u5909\u6570s\u306b “racecar” \u3092\u4ee3\u5165\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u306e\u5f8c\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50 (==)
\n\u3092\u4f7f\u3063\u3066\u5909\u6570s\u3068s.reverse\u306e\u5024\u304c\u540c\u3058\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3001\u8abf\u3079\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
>> s = \"racecar\" => \"racecar\"<\/strong>\r\n>> s == s.reverse => true<\/strong><\/pre>\n
4:puts “It’s a palindrome!” if s == s.reverse\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u3069\u3093\u306a\u7d50\u679c\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u304b?
\n\u5909\u6570s\u306b “onomatopoeia” \u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u4ee3\u5165\u3059\u308b\u3068\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b?<\/h3>\n
puts \"It's a palindrome!\" if s == s.reverse<\/strong>\r\nIt's a palindrome! => nil<\/strong>\r\n\r\ns = \"onomatopoeia\" => \"onomatopoeia\"<\/strong>\r\n\r\nputs \"It's a palindrome!\" if s == s.reverse<\/strong>\r\n=> nil<\/strong>\r\n\r\ndef string_message(str = '')<\/strong>\r\n  if str.empty?<\/strong>\r\n    \"It's an empty string!\"<\/strong>\r\n  else<\/strong>\r\n    \"The string is nonempty.\"<\/strong>\r\n  end<\/strong>\r\nend<\/strong>\r\n:string_message<\/strong>\r\nputs string_message<\/strong>\r\nIt's an empty string!<\/strong><\/pre>\n
puts string_message\u306e\u3088\u3046\u306b\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059(\u30ab\u30c3\u30b3\u3067\u3059\u3089\u7701\u7565\u53ef\u80fd)\u3002<\/p>\n
def string_message(str = '')<\/strong><\/pre>\n
\u5f15\u6570\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u542b\u3081\u3066\u3044\u308b\u304b\u3089\u3067
\n\u5f15\u6570\u3092\u6e21\u3055\u306a\u3044\u5834\u5408\u306f\u3001\u6307\u5b9a\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u304c\u81ea\u52d5\u7684\u306b\u4f7f\u308f\u308c\u308b\u307e\u3059\u3002<\/p>\n
Ruby\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u300c\u6697\u9ed9\u306e\u623b\u308a\u5024\u304c\u3042\u308b\u300d\u3053\u3068\u306b\u6ce8\u610f\u3002\u3053\u308c\u306f\u3001
\n\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u6700\u5f8c\u306b\u8a55\u4fa1\u3055\u308c\u305f\u5f0f\u306e\u5024\u304c\u81ea\u52d5\u7684\u306b\u8fd4\u3055\u308c\u308b\u3053\u3068\u3092\u610f\u5473\u3059\u308b
\n(\u30e1\u30bd\u30c3\u30c9\u3067\u623b\u308a\u5024\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3057\u306a\u304b\u3063\u305f\u5834\u5408\u306e\u52d5\u4f5c)<\/p>\n
\u30e1\u30bd\u30c3\u30c9\u3067\u5f15\u6570\u306e\u5909\u6570\u540d\u306b\u3069\u3093\u306a\u540d\u524d\u3092\u4f7f\u3063\u3066\u3082\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u5074\u306b\u306f
\n\u4f55\u306e\u5f71\u97ff\u3082\u751f\u3058\u306a\u3044\u3068\u3044\u3046\u70b9\u306b\u3082\u3054\u6ce8\u76ee\u304f\u3060\u3055\u3044\u3002\u3064\u307e\u308a\u3001\u6700\u521d\u306e\u4f8b\u306estr\u3092
\n\u5225\u306e\u5909\u6570\u540d (the_function_argument\u306a\u3069) \u306b\u5909\u66f4\u3057\u3066\u3082\u3001
\n\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u65b9\u306f\u5168\u304f\u540c\u3058\u3067\u3059<\/p>\n
>> def string_message(the_function_argument = '')<\/strong>\r\n>> if the_function_argument.empty?<\/strong>\r\n>> \"It's an empty string!\"<\/strong>\r\n>> else<\/strong>\r\n>> \"The string is nonempty.\"<\/strong>\r\n>> end<\/strong>\r\n>> end<\/strong>\r\n=> :string_message<\/strong>\r\n>> puts string_message(\"\")<\/strong>\r\nIt's an empty string!<\/strong>\r\n>> puts string_message(\"foobar\")<\/strong>\r\nThe string is nonempty.<\/strong><\/pre>\n
\u6f14\u7fd2<\/h2>\n
1:FILL_IN\u306e\u90e8\u5206\u3092\u9069\u5207\u306a\u30b3\u30fc\u30c9\u306b\u7f6e\u304d\u63db\u3048\u3001\u56de\u6587\u304b\u3069\u3046\u304b\u3092
\n\u30c1\u30a7\u30c3\u30af\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n
def palindrome_tester(s)<\/strong>\r\n  if FILL_IN<\/strong>\r\n    puts \"It's a palindrome!\"<\/strong>\r\n  else<\/strong>\r\n    puts \"It's not a palindrome.\"<\/strong>\r\n  end<\/strong>\r\nend<\/strong><\/pre>\n
FILL_IN s == s.reverse<\/strong><\/p>\n
2:\u4e0a\u3067\u5b9a\u7fa9\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066 \u201cracecar\u201d \u3068 \u201conomatopoeia\u201d \u304c\u56de\u6587\u304b
\n\u3069\u3046\u304b\u3092\u78ba\u304b\u3081\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\uff11\u3064\u76ee\u306f\u56de\u6587\u3067\u3042\u308b\u3001\uff12\u3064\u76ee\u306f\u56de\u6587\u3067\u306a\u3044\u3001
\n\u3068\u3044\u3046\u7d50\u679c\u306b\u306a\u308c\u3070\u6210\u529f\u3067\u3059\u3002<\/h3>\n
>>palindrome_tester(\"racecar\")<\/strong>\r\n=>It's a palindrome! => nil<\/strong>\r\n\r\n>>palindrome_tester(\"onomatopoeia\")<\/strong>\r\n=>It's not a palindrome. => nil<\/strong><\/pre>\n
3:palindrome_tester(“racecar”)\u306b\u5bfe\u3057\u3066nil?\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3001
\n\u623b\u308a\u5024\u304cnil\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044<\/h3>\n
def palindrome_tester(s) def palindrome_tester(s = '')<\/strong>\r\n  if s == s.reverse<\/strong>\r\n   puts \"It's a palindrome!\"\r\n<\/strong>    else<\/strong>\r\n   puts \"It's not a palindrome.\"\r\n<\/strong>    end<\/strong>\r\n end<\/strong>\r\n:palindrome_tester<\/strong>\r\nputs palindrome_tester('racecar')<\/strong><\/pre>\n
\u4e0b\u3067\u3082OK<\/p>\n
def palindrome_tester(s = 'racecar')<\/strong>\r\n  if s == s.reverse<\/strong>\r\n    puts \"It's a palindrome!\"<\/strong>\r\n  else<\/strong>\r\n    puts \"It's not a palindrome.\"<\/strong>\r\n  end<\/strong>\r\nend<\/strong>\r\n\r\n:palindrome_tester<\/strong>\r\npalindrome_tester.nil?<\/strong><\/pre>\n
()\u304c\u306a\u3044\u5834\u5408\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u8a2d\u5b9a\u3057\u305f\u3082\u306e(1\u884c\u76ee)\u304c\u5f15\u6570\u306b\u3042\u308b\u306e\u3067<\/p>\n
module ApplicationHelper<\/strong><\/p>\n
\u00a0app\/helpers\/application_helper.rb<\/code><\/span><\/div>\n
 <\/p>\n
module<\/span> ApplicationHelper\r\n# \u30da\u30fc\u30b8\u3054\u3068\u306e\u5b8c\u5168\u306a\u30bf\u30a4\u30c8\u30eb\u3092\u8fd4\u3057\u307e\u3059\u3002 # \u30b3\u30e1\u30f3\u30c8\u884c<\/span> \r\n# \u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9\u3068\u30aa\u30d7\u30b7\u30e7\u30f3\u5f15\u6570<\/strong>\r\ndef full_title(page_title = '') \r\n<\/strong># \u5909\u6570\u3092\u4ee3\u5165\u3057\u3066\u3044\u308b\u3088<\/strong>\r\n  base_title = \"Ruby on Rails Tutorial Sample App\" \r\n# \u8ad6\u7406\u5024\u30c6\u30b9\u30c8<\/strong>\r\n   if page_title.empty? <\/strong>\r\n# \u6697\u9ed9\u306e\u623b\u308a\u5024    \r\n    base_title <\/strong>\r\n   else<\/strong>\r\n  page_title + \" | \" + base_title # \u6587\u5b57\u5217\u306e\u7d50\u5408<\/strong>\r\n   end<\/strong>\r\n end<\/strong>\r\nend<\/strong><\/pre>\n
\u30e2\u30b8\u30e5\u30fc\u30eb\u306f\u3001\u95a2\u9023\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u307e\u3068\u3081\u308b\u65b9\u6cd5\u306e\uff11\u3064\u3067\u3001
\n\u203binclude\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308b\u3088
\n(\u30df\u30c3\u30af\u30b9\u30a4\u30f3 (mixed in) \u3068\u3082\u547c\u3076
\nRails\u3067\u306f\u81ea\u52d5\u7684\u306b\u30d8\u30eb\u30d1\u30fc\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3067\u304f\u308c\u308b\u306e\u3067\u3001
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