{"id":40205,"date":"2025-10-30T06:27:10","date_gmt":"2025-10-30T06:27:10","guid":{"rendered":"https:\/\/www.railscarma.com\/?p=40205"},"modified":"2025-11-03T06:19:30","modified_gmt":"2025-11-03T06:19:30","slug":"ruby%e3%81%a7%e7%a9%ba%e7%99%bd%e3%81%aenil%e3%81%a8empty%e3%82%92%e7%90%86%e8%a7%a3%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby%e3%81%a7%e7%a9%ba%e7%99%bd%e3%81%aenil%e3%81%a8empty%e3%82%92%e7%90%86%e8%a7%a3%e3%81%99%e3%82%8b\/","title":{"rendered":"Ruby\u3092\u7406\u89e3\u3059\u308b Present?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"40205\" class=\"elementor elementor-40205\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bbc21fe elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"bbc21fe\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e165521\" data-id=\"e165521\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ef0df41 elementor-widget elementor-widget-text-editor\" data-id=\"ef0df41\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u30a8\u30ec\u30ac\u30f3\u30c8\u306a\u69cb\u6587\u3068\u8868\u73fe\u529b\u3092\u6301\u3064Ruby\u306f\u3001\u30c7\u30fc\u30bf\u306e\u4e0d\u5728\u3092\u6271\u3046\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3092\u958b\u767a\u8005\u306b\u63d0\u4f9b\u3059\u308b\u30024\u3064\u306e\u30e1\u30bd\u30c3\u30c9 <code>nil\uff1f\u3001empty\uff1f\u3001blank\uff1f<\/code>\u3001 \u305d\u3057\u3066 <code>\u73fe\u5728\uff1f<\/code> - \u306f\u3001\u30af\u30ea\u30fc\u30f3\u3067\u3001\u5b89\u5168\u3067\u3001\u6163\u7528\u7684\u306aRuby\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u305f\u3081\u306e\u57fa\u672c\u3067\u3059\u3002\u4e00\u898b\u4f3c\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u201c\u7121 \u201d\u3092\u6271\u3046\u3068\u3044\u3046Ruby\u306e\u54f2\u5b66\u306b\u304a\u3044\u3066\u3001\u305d\u308c\u305e\u308c\u304c\u660e\u78ba\u306a\u76ee\u7684\u3092\u62c5\u3063\u3066\u3044\u308b\u3002\u201d<\/p>\n<p>\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306fRuby\u306e\u30b3\u30a2\u3068Rails\u306eActive Support\u62e1\u5f35\u6a5f\u80fd\u306e\u4e00\u90e8\u3067\u3042\u308a\u3001\u7279\u306b\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u3001API\u30ec\u30b9\u30dd\u30f3\u30b9\u3001\u8a2d\u5b9a\u30c7\u30fc\u30bf\u3092\u6271\u3046\u5834\u5408\u306f\u3001\u305d\u306e\u30cb\u30e5\u30a2\u30f3\u30b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u5805\u7262\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u66f8\u304f\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002.<\/p>\n<h3><strong>\u30eb\u30d3\u30fc\u30fb\u30cb\u30eb\uff1f- \u6839\u672c\u7684\u306a\u4e0d\u5728<\/strong><\/h3>\n<p>\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308bRuby\u306e\u30b3\u30a2\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002 <code>\u5bfe\u8c61<\/code>. .\u3092\u8fd4\u3057\u307e\u3059\u3002 <code>\u771f\u5b9f<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c <code>\u30bc\u30ed<\/code> - \u30eb\u30d3\u30fc\u306f \u201c\u4f55\u3082\u306a\u3044\u201d\u3001\u201c\u4fa1\u5024\u304c\u306a\u3044 \u201d\u3068\u8868\u73fe\u3059\u308b\u3002\u201d<\/p>\n<pre>\u30eb\u30d3\u30fc\nnil.nil?          # =&gt; true\n\"\".nil?           # =&gt; false\n[].nil?           # =&gt; false\nfalse.nil\uff1f        # =&gt; false\n0.nil?            # =&gt; false<\/pre>\n<h4><strong>\u4e3b\u306a\u7279\u5fb4<\/strong><\/h4>\n<ul>\n<li><strong>\u53b3\u3057\u3044<\/strong>:\u306e\u307f <code>\u30bc\u30ed<\/code> \u771f\u3092\u8fd4\u3059<\/li>\n<li><strong>\u901f\u3044<\/strong>:\u30cd\u30a4\u30c6\u30a3\u30d6C\u5b9f\u88c5<\/li>\n<li><strong>\u30e6\u30cb\u30d0\u30fc\u30b5\u30eb<\/strong>:\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u5229\u7528\u53ef\u80fd<\/li>\n<\/ul>\n<h4><strong>\u4e00\u822c\u7684\u306a\u4f7f\u7528\u4f8b<\/strong><\/h4>\n<p><strong>\u907f\u3051\u308b <\/strong><code>\u30e1\u30bd\u30c3\u30c9\u30a8\u30e9\u30fc<\/code><\/p>\n<pre>\u30eb\u30d3\u30fc\nuser = User.find_by(email: params[:email])\n\nif user.nil?\n  render json: { error\uff1a\"User not found\" }, status: :not_found\nelse\n  json \u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0: user\n\u7d42\u4e86<\/pre>\n<p><strong>\u5b89\u5168\u306a\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3 <\/strong><code>&amp;.<\/code><strong> (Ruby 2.3+)<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc<br>\u30e6\u30fc\u30b6\u30fc &amp; \u30d7\u30ed\u30d5\u30a3\u30fc\u30eb &amp; \u30a2\u30d0\u30bf\u30fc URL<br>#\u3068\u540c\u7b49\uff1a<br>user .nil : (user . profile . nil? ? nil : user . profile.avatar_url)<\/pre>\n<p><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\ncache_key = params[:id] || 'default'\n#\u306e\u65b9\u304c\u826f\u3044\uff1a\ncache_key = params[:id].presence || 'default'<\/pre>\n<h3><strong>\u30eb\u30d3\u30fc\u30fb\u30a8\u30f3\u30d7\u30c6\u30a3\uff1f<\/strong><\/h3>\n<p><code>\u7a7a\u3063\u307d\uff1f<\/code> \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u8981\u7d20\u304c\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u3053\u308c\u306f <code>\u914d\u5217\u3001\u30cf\u30c3\u30b7\u30e5\u3001\u6587\u5b57\u5217\u3001\u30bb\u30c3\u30c8\u3001,<\/code> \u306a\u3069\u306e\u5217\u6319\u578b\u304c\u3042\u308b\u3002.<\/p>\n<pre>\u30eb\u30d3\u30fc\n[].empty?         # =&gt; true\n{}.empty?         # =&gt; true\n\"\".empty?         # =&gt; true\n\"   \".empty\uff1f      # =&gt; false\n[nil].empty\uff1f      # =&gt; false<\/pre>\n<h4><strong>\u91cd\u8981\u306a\u6ce8\u610f\u4e8b\u9805<\/strong><\/h4>\n<ul>\n<li><strong>\u7a7a\u767d\u306f\u7a7a\u3067\u306f\u306a\u3044<\/strong>: <code>\"\".empty?# =&gt; false<\/code><\/li>\n<li><strong>\u5b58\u5728\u611f <\/strong><code>\u30bc\u30ed<\/code><strong> \u30ab\u30a6\u30f3\u30c8<\/strong>: <code>[nil].empty\uff1f# =&gt; false<\/code><\/li>\n<li><strong>\u30b5\u30a4\u30ba\u30c1\u30a7\u30c3\u30af\u306e\u307f<\/strong>:\u5185\u5bb9\u3092\u8a55\u4fa1\u3057\u306a\u3044<\/li>\n<\/ul>\n<h4><strong>\u5b9f\u4f8b<\/strong><\/h4>\n<p><strong>\u30d5\u30a9\u30fc\u30e0\u5165\u529b\u306e\u691c\u8a3c<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\nif params[:tags].empty?\n  errors.add(:tags, \"\u7a7a\u306b\u306f\u3067\u304d\u306a\u3044\")\n\u7d42\u4e86<\/pre>\n<p><strong>\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\n&amp;lt;% if @comments.empty?%\n  &lt;p&gt;\u30b3\u30e1\u30f3\u30c8\u306f\u307e\u3060\u3042\u308a\u307e\u305b\u3093\u3002.&lt;\/p&gt;\n.\n  &lt;%= render @comments %&gt;\n&amp;lt;%\u7d42\u4e86 %<\/pre>\n<p><strong>API\u30ec\u30b9\u30dd\u30f3\u30b9<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\ndef\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\n  \u30ec\u30b3\u30fc\u30c9 = Record.active\n  render json: records, status: records.empty?:no_content : :ok\n\u7d42\u4e86<\/pre>\n<h3><strong>\u30eb\u30d3\u30fc <\/strong><code>\u7a7a\u767d\uff1f<\/code><strong> - \u30ec\u30a4\u30eb\u30ba\u30fb\u30d1\u30ef\u30fc\u30fb\u30c4\u30fc\u30eb<\/strong><\/h3>\n<p><code>\u7a7a\u767d\uff1f<\/code> \u306f <strong>\u306a\u3044<\/strong> \u30b3\u30a2Ruby\u306e\u4e00\u90e8\u3067\u3042\u308b\u3002\u3053\u308c\u306f <strong>\u30a2\u30af\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8<\/strong> \u62e1\u5f35\u6a5f\u80fd (Rails \u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u542b\u307e\u308c\u3066\u3044\u307e\u3059) \u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u300c\u7a7a\u767d\u300d\u3067\u3042\u308b\u5834\u5408\u306b\u305d\u308c\u3092\u300c\u7a7a\u767d\u300d\u3068\u898b\u306a\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li><code>\u9593\u9055\u3044<\/code><\/li>\n<li><code>\u30bc\u30ed<\/code><\/li>\n<li>\u7a7a\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3<code>[].empty?, \"\".empty?,<\/code> \u306a\u3069)<\/li>\n<li>\u7a7a\u767d\u306e\u307f\u306e\u6587\u5b57\u5217 (<code>\"\".blank?# =&gt; true<\/code>)<\/li>\n<li>\u306b\u5fdc\u7b54\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3059\u3079\u3066 <code>\u7a7a\u3063\u307d\uff1f<\/code> \u3092\u8fd4\u3059\u3002 <code>\u771f\u5b9f<\/code><\/li>\n<\/ul>\n<pre>\u30eb\u30d3\u30fc\nnil.blank?        # =&gt; true\nfalse.blank\uff1f      # =&gt; true\n\"\".blank?         # =&gt; true\n\"   \".blank\uff1f      # =&gt; true\n[].blank?         # =&gt; true\n{}.blank?         # =&gt; true\n0.blank\uff1f          # =&gt; false\n\"\u3053\u3093\u306b\u3061\u306f\".blank?    # =&gt; false<\/pre>\n<h4><strong>\u4ed5\u7d44\u307f<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n# Active Support \u30b3\u30a2\u62e1\u5f35\n\u30af\u30e9\u30b9 Object\n  def blank?\n    respond_to?(:empty?) ?\u7a7a\uff1f\n  end\n\u7d42\u4e86\n\n\u30af\u30e9\u30b9 NilClass\n  def blank?\n    true\n  \u7d42\u4e86\n\u7d42\u4e86\n\n\u30af\u30e9\u30b9 FalseClass\n  def blank?\n    true\n  \u7d42\u4e86\n\u7d42\u4e86\n\n\u30af\u30e9\u30b9 TrueClass\n  def blank?\n    false\n  \u7d42\u4e86\n\u7d42\u4e86\n\n\u30af\u30e9\u30b9 Array\n  alias_method :blank?, :empty?\nend\n\n\u30af\u30e9\u30b9 Hash\n  alias_method :blank?, :empty?\nend\n\n\u30af\u30e9\u30b9 String\n  def blank?\n    strip.empty\uff1f\n  end\n\u7d42\u4e86<\/pre>\n<h4><strong>\u5b9f\u8df5\u7684\u5fdc\u7528<\/strong><\/h4>\n<p><strong>\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306e\u30af\u30ea\u30fc\u30cb\u30f3\u30b0<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\ndef clean_name\n  params[:name].presence || \"Anonymous\"\n\u7d42\u4e86<\/pre>\n<p><strong>\u6761\u4ef6\u8ad6\u7406<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\nif @user.bio.blank?\n  user.bio = \"\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u7d4c\u6b74\u3092\u66f8\u3044\u3066\u3044\u307e\u305b\u3093\u3002\"\n\u7d42\u4e86<\/pre>\n<p><strong>\u30c7\u30fc\u30bf\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\nvalid_emails = users.map(&amp;:email).reject(&amp;:blank?)<\/pre>\n<p><strong>\u30d5\u30a9\u30fc\u30e0\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\nvalidates :title, presence: true\n#\u306f\u5185\u90e8\u7684\u306b\u6b21\u306e\u3088\u3046\u306b\u4f7f\u3063\u3066\u3044\u308b: !title.blank?<\/pre>\n<h3><strong>\u30eb\u30d3\u30fc <\/strong><code>\u73fe\u5728\uff1f<\/code><strong> - \u30dd\u30b8\u30c6\u30a3\u30d6\u306a\u76f8\u624b<\/strong><\/h3>\n<h4><strong>\u305d\u308c\u306f\u4f55\u304b<\/strong><\/h4>\n<p><code>\u73fe\u5728\uff1f<\/code> \u3068\u306f\u8ad6\u7406\u7684\u306b\u6b63\u53cd\u5bfe\u3067\u3042\u308b\u3002 <code>\u7a7a\u767d\uff1f<\/code>. .\u3092\u8fd4\u3057\u307e\u3059\u3002 <code>\u771f\u5b9f<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c <strong>\u7a7a\u767d\u3067\u306f\u306a\u3044<\/strong>.<\/p>\n<pre>\u30eb\u30d3\u30fc\n\"hello\".present?  # =&gt; true\n\"   \".present?    # =&gt; false\nnil.present\uff1f      # =&gt; false\n[].present?       # =&gt; false\n[1].present?      # =&gt; true<\/pre>\n<h4><strong>\u5b9f\u65bd<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n\u30af\u30e9\u30b9 Object\n  def present?\n    \u7a7a\u767d\uff1f\n  \u7d42\u4e86\n\u7d42\u4e86<\/pre>\n<h4><strong>\u306e\u30de\u30b8\u30c3\u30af <\/strong><code>.\u30d7\u30ec\u30bc\u30f3\u30b9<\/code><\/h4>\n<p>\u6700\u3082\u611b\u3055\u308c\u3066\u3044\u308bRails\u30a4\u30c7\u30a3\u30aa\u30e0\u306e1\u3064\uff1a<\/p>\n<pre>\u30eb\u30d3\u30fc\nparams[:page].presence || 1\n#\u5b58\u5728\u3059\u308c\u3070params[:page]\u3092\u3001\u305d\u3046\u3067\u306a\u3051\u308c\u30701\u3092\u8fd4\u3059\u3002<\/pre>\n<p><strong>\u3069\u306e\u3088\u3046\u306b <\/strong><code>.\u30d7\u30ec\u30bc\u30f3\u30b9<\/code><strong> \u4f5c\u54c1<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\n\u30af\u30e9\u30b9 Object\n  def presence\n    self if present?\n  \u7d42\u4e86\n\u7d42\u4e86\n\n\u30af\u30e9\u30b9 NilClass\n  def presence\n    \u30bc\u30ed\n  \u7d42\u4e86\n\u7d42\u4e86\n\u3068\u3044\u3046\u308f\u3051\u3067\n\u30eb\u30d3\u30fc\n\"\".presence # =&gt; nil\n\"hello\".presence # =&gt; \"hello\"\nnil.presence # =&gt; nil<\/pre>\n<p><strong>\u5b9f\u969b\u306e\u4f7f\u7528\u4f8b<\/strong><\/p>\n<pre>\u30eb\u30d3\u30fc\n# \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a\u3059\u308b\npage = params[:page].presence || 1\nper_page = params[:per_page].presence || 20\n\n#\u30af\u30ea\u30fc\u30f3\u30d1\u30e9\u30e1\u30fc\u30bf\nsearch_term = params[:q].presence\n\n# \u6761\u4ef6\u4ed8\u304d\u4ee3\u5165\n\u30bf\u30a4\u30c8\u30eb = article.title.presence || \"\u7121\u984c\"<\/pre>\n<h3><strong>\u6bd4\u8f03\u8868<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u4fa1\u5024<\/th>\n<th><code>\u30bc\u30ed\u304b\uff1f<\/code><\/th>\n<th><code>\u7a7a\u3063\u307d\uff1f<\/code><\/th>\n<th><code>\u7a7a\u767d\uff1f<\/code><\/th>\n<th><code>\u73fe\u5728\uff1f<\/code><\/th>\n<\/tr>\n<tr>\n<td><code>\u30bc\u30ed<\/code><\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u30a8\u30e9\u30fc<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u9593\u9055\u3044<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u30a8\u30e9\u30fc<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u771f\u5b9f<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u30a8\u30e9\u30fc<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<\/tr>\n<tr>\n<td><code>\"\"<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\" \"<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\"\u300c\u3053\u3093\u306b\u3061\u306f\"<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<\/tr>\n<tr>\n<td><code>[]<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u30bc\u30ed<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<\/tr>\n<tr>\n<td><code>{}<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u771f\u5b9f<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>0<\/code><\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u30a8\u30e9\u30fc<\/td>\n<td>\u9593\u9055\u3044<\/td>\n<td>\u771f\u5b9f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong>\u5171\u901a\u30d1\u30bf\u30fc\u30f3\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/h3>\n<h4><strong>1.\u4f7f\u7528\u65b9\u6cd5 <\/strong><code>\u30d7\u30ec\u30bc\u30f3\u30b9<\/code><strong> \u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n# \u826f\u3044\nlimit = params[:limit].presence || 100\n\n#\u907f\u3051\u308b\nlimit = params[:limit] unless params[:limit].blank?<\/pre>\n<h4><strong>2.\u3067\u691c\u8a3c\u3059\u308b\u3002 <\/strong><code>\u7a7a\u767d\uff1f<\/code><strong> in Rails<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\nvalidates :email, presence: true, uniqueness: true\n# nil, \"\", \" \" \u3092\u62d2\u5426\u3059\u308b\u3002\"<\/pre>\n<h4><strong>3.\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u5b89\u5168\u306b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n# \u7a7a\u767d\u30a8\u30f3\u30c8\u30ea\u3092\u524a\u9664\u3059\u308b\nclean_array = dirty_array.reject(&amp;:blank?)\n\n# \u5b58\u5728\u5024\u306e\u307f\u3092\u4fdd\u6301\u3059\u308b\n\u73fe\u5728\u5024 = array.map(&amp;:presence).compact<\/pre>\n<h4><strong>4.API\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u53d6\u308a\u6271\u3044<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\ndef\u691c\u7d22\n  query = params[:q].presence\n  return render json: { error\uff1a\"Query required\" } unless query\n\n  results = Product.search(query)\n  json \u3092\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\n\u7d42\u4e86<\/pre>\n<h4><strong>5.\u30d3\u30e5\u30fc\u3067\u306e\u6761\u4ef6\u4ed8\u304d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/strong><\/h4>\n<pre>\u30a2\u30fc\u30d6\n&amp;lt;% if @user.bio.present?%\n  &lt;p&gt;\u3002&lt;\/p&gt;\n.\n  &lt;p&gt;&lt;em&gt;\u7565\u6b74\u306f\u306a\u3044\u3002.&lt;\/em&gt;&lt;\/p&gt;\n&amp;lt;%\u7d42\u4e86 %<\/pre>\n<h3><strong>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3068\u30b4\u30c3\u30c1\u30e3<\/strong><\/h3>\n<h4><strong>1.\u30ab\u30b9\u30bf\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n\u30af\u30e9\u30b9 Box\n  def empty?\n    || @items.nil\uff1f|| @items.empty\uff1f\n  end\n\u7d42\u308f\u308a\n\nBox.new.blank?  # =&gt; true if empty?<\/pre>\n<h4><strong>2.\u6570\u5b57\u3068\u30d6\u30fc\u30eb\u6570<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n0.present?      # =&gt; true\nfalse.present?  # =&gt; false<\/pre>\n<h4><strong>3.ActiveRecord \u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\nUser.new.saved_changes?  # =&gt; false\nUser.new.present?        # =&gt; true\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3059\u308b\uff09<\/pre>\n<h4><strong>4.\u7a7a\u767d\u6587\u5b57\u5217<\/strong><\/h4>\n<pre>\u30eb\u30d3\u30fc\n\"   \\# =&gt; \"\"\n\"   \\ruby\".blank\uff1f   # =&gt; true<\/pre>\n<h3><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u8003\u5bdf<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u65b9\u6cd5<\/th>\n<th>\u30b9\u30d4\u30fc\u30c9<\/th>\n<th>\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/th>\n<\/tr>\n<tr>\n<td><code>\u30bc\u30ed\u304b\uff1f<\/code><\/td>\n<td>\u6700\u901f<\/td>\n<td>\u53b3\u683c\u306a\u30bc\u30ed\u30fb\u30c1\u30a7\u30c3\u30af<\/td>\n<\/tr>\n<tr>\n<td><code>\u7a7a\u3063\u307d\uff1f<\/code><\/td>\n<td>\u975e\u5e38\u306b\u901f\u3044<\/td>\n<td>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3068\u6587\u5b57\u5217<\/td>\n<\/tr>\n<tr>\n<td><code>\u7a7a\u767d\uff1f<\/code><\/td>\n<td>\u9045\u3044<\/td>\n<td>\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3001\u30d5\u30a9\u30fc\u30e0\u3001API<\/td>\n<\/tr>\n<tr>\n<td><code>\u73fe\u5728\uff1f<\/code><\/td>\n<td>\u30d6\u30e9\u30f3\u30af\u3068\u540c\u3058\uff1f<\/td>\n<td>\u30dd\u30b8\u30c6\u30a3\u30d6\u30fb\u30ed\u30b8\u30c3\u30af<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u30c1\u30c3\u30d7<\/strong>:\u7528\u9014 <code>\u30bc\u30ed\u304b\uff1f<\/code> \u305d\u3057\u3066 <code>\u7a7a\u3063\u307d\uff1f<\/code> \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u91cd\u8981\u3067\u3001\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\u304c\u8a31\u3059\u5834\u5408\u3002.<\/p>\n<h3><strong>RSpec\u3092\u4f7f\u3063\u305f\u30c6\u30b9\u30c8<\/strong><\/h3>\n<pre>\u30eb\u30d3\u30fc\nRSpec.describe User do\n  it \"\u5b58\u5728\u3092\u691c\u8a3c\u3059\u308b\" do\n    user = User.new(email: \" \")\n    expect(user).not_to be_valid\n    expect(user.errors[:email]).to include(\"can't be blank\")\n  \u7d42\u4e86\n\n  \u305d\u308c\u306f \"\u5b89\u5168\u306bnil\u3092\u51e6\u7406\u3059\u308b\" do\n    expect(nil.nil?).to be true\n    expect(nil.present?).to be false\n  \u7d42\u4e86\n\u7d42\u4e86<\/pre>\n<h3><strong>\u30d7\u30ec\u30fc\u30f3Ruby\u3068Rails\u306e\u6bd4\u8f03<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<th>\u65b9\u6cd5<\/th>\n<th>\u30b3\u30a2\u30fb\u30eb\u30d3\u30fc<\/th>\n<th>\u30ec\u30fc\u30eb\uff0f\u30a2\u30af\u30c6\u30a3\u30d6\u30b5\u30dd\u30fc\u30c8<\/th>\n<\/tr>\n<tr>\n<td><code>\u30bc\u30ed\u304b\uff1f<\/code><\/td>\n<td>\u306f\u3044<\/td>\n<td>\u306f\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u7a7a\u3063\u307d\uff1f<\/code><\/td>\n<td>\u306f\u3044<\/td>\n<td>\u306f\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u7a7a\u767d\uff1f<\/code><\/td>\n<td>\u3044\u3044\u3048<\/td>\n<td>\u306f\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>\u73fe\u5728\uff1f<\/code><\/td>\n<td>\u3044\u3044\u3048<\/td>\n<td>\u306f\u3044<\/td>\n<\/tr>\n<tr>\n<td><code>.\u30d7\u30ec\u30bc\u30f3\u30b9<\/code><\/td>\n<td>\u3044\u3044\u3048<\/td>\n<td>\u306f\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4f7f\u7528\u65b9\u6cd5 <code>\u7a7a\u767d\uff1f<\/code> \u305d\u3057\u3066 <code>\u73fe\u5728\uff1f<\/code> \u3092Rails\u4ee5\u5916\u306e\u30a2\u30d7\u30ea\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre>\u30eb\u30d3\u30fc\nrequire 'active_support'\nrequire 'active_support\/core_ext\/object\/blank' \u3067\u3059\u3002'<\/pre>\n<h3><strong>\u30d7\u30ed\u306e\u30a2\u30c9\u30d0\u30a4\u30b9<\/strong><\/h3>\n<ol>\n<li><strong>\u5b89\u5168\u822a\u884c\u306e\u305f\u3081\u306e\u30c1\u30a7\u30fc\u30f3<\/strong>:\n<pre>\u30eb\u30d3\u30fc\nuser&amp;.settings&amp;.theme.presence || 'default'<\/pre>\n<\/li>\n<li><strong>\u30de\u30a4\u30b0\u30ec\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u4f7f\u7528<\/strong>:\n<pre>\u30eb\u30d3\u30fc\nchange_column_default:\u30e6\u30fc\u30b6\u30fc, :\u30b9\u30c6\u30fc\u30bf\u30b9, '\u30a2\u30af\u30c6\u30a3\u30d6'\n# \u305d\u308c\u304b\u3089\nuser.status.presence || 'active'<\/pre>\n<\/li>\n<li><strong>API\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u7ba1\u7406<\/strong>:\n<pre>\u30eb\u30d3\u30fc\nformat = params[:format].presence&amp;.to_sym || :json<\/pre>\n<\/li>\n<li><strong>\u5927\u91cf\u5272\u308a\u5f53\u3066\u4fdd\u8b77<\/strong>:\n<pre>\u30eb\u30d3\u30fc\nuser.update(user_params.reject { |_, v| v.blank? })<\/pre>\n<\/li>\n<\/ol>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>\u30de\u30b9\u30bf\u30ea\u30f3\u30b0 <code>nil\uff1f\u3001empty\uff1f\u3001blank\uff1f<\/code>\u3001 \u305d\u3057\u3066 <code>\u73fe\u5728\uff1f<\/code> \u30e1\u30bd\u30c3\u30c9\u540d\u3092\u899a\u3048\u308b\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 <strong>\u660e\u78ba\u3001\u5b89\u5168\u3001\u8868\u73fe\u529b<\/strong> \u30eb\u30d3\u30fc\u30fb\u30b3\u30fc\u30c9.<\/p>\n<ul>\n<li>\u7528\u9014 <code>\u30bc\u30ed\u304b\uff1f<\/code> \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e0d\u5728\u3092\u7279\u306b\u6c17\u306b\u3059\u308b\u5834\u5408<\/li>\n<li>\u7528\u9014 <code>\u7a7a\u3063\u307d\uff1f<\/code> \u610f\u5473\u306e\u306a\u3044\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u6587\u5b57\u5217\u306e\u5834\u5408<\/li>\n<li>\u7528\u9014 <code>\u7a7a\u767d\uff1f<\/code> \u305d\u3057\u3066 <code>\u73fe\u5728\uff1f<\/code> (Rails\u3067)\u30e6\u30fc\u30b6\u30fc\u5411\u3051\u306e\u30c7\u30fc\u30bf\u3068\u5165\u529b\u306e\u30b5\u30cb\u30bf\u30a4\u30ba\u3092\u884c\u3046\u3002<\/li>\n<li>\u30ec\u30d0\u30ec\u30c3\u30b8 <code>.\u30d7\u30ec\u30bc\u30f3\u30b9<\/code> \u7a76\u6975\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u30b7\u30e7\u30fc\u30c8\u30ab\u30c3\u30c8\u3068\u3057\u3066<\/li>\n<\/ul>\n<p>\u3053\u308c\u30894\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001Ruby\u306b\u304a\u3051\u308b\u9632\u5fa1\u7684\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u30d0\u30c3\u30af\u30dc\u30fc\u30f3\u3092\u5f62\u6210\u3057\u3066\u3044\u308b\u3002\u3053\u308c\u3089\u306f\u3001\u30af\u30e9\u30c3\u30b7\u30e5\u3092\u9632\u304e\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3092\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3057\u3001\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u3001\u3042\u306a\u305f\u306e\u610f\u56f3\u3092\u660e\u793a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/p>\n<p>\u30eb\u30d3\u30fc\u306e\u54f2\u5b66\u306e\u8a00\u8449\u3067\u3042\u308b\uff1a <em>\u201c\u9001\u308b\u3082\u306e\u306b\u306f\u53b3\u3057\u304f\u3001\u53d7\u3051\u5165\u308c\u308b\u3082\u306e\u306b\u306f\u5bdb\u5927\u3067\u3042\u308c\u201d<\/em> \u306b\u3057\u3066\u304a\u3053\u3046\u3002 <code>\u7a7a\u767d\uff1f<\/code> \u305d\u3057\u3066 <code>\u73fe\u5728\uff1f<\/code> \u30ea\u30d9\u30e9\u30eb\u306a\u30b2\u30fc\u30c8\u30ad\u30fc\u30d1\u30fc\u3067\u3042\u308a <code>\u30bc\u30ed\u304b\uff1f<\/code> \u3042\u306a\u305f\u306e\u53b3\u683c\u306a\u898b\u5f35\u308a\u756a\u3002.<\/p><p>\u3068\u63d0\u643a\u3059\u308b\u3002 <strong data-start=\"661\" data-end=\"714\"><a href=\"https:\/\/www.railscarma.com\/ja\">Ruby on Rails\u958b\u767a\u4f1a\u793e<\/a> RailsCarma\u306e\u3088\u3046\u306a<\/strong> \u306f\u3001\u3053\u308c\u3089\u306e\u539f\u5247\u3092\u6d3b\u7528\u3057\u3066\u3001Ruby 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Four methods \u2014 nil?, empty?, blank?, and present? \u2014 are fundamental to writing clean, safe, and idiomatic Ruby code. While they may seem similar at first glance, each serves a distinct purpose in the language\u2019s philosophy of handling &#8220;nothingness.&#8221; These methods are part of Ruby\u2019s core and Rails\u2019 Active Support extensions, and understanding their nuances is essential for writing robust applications, especially when dealing with user input, database queries, API responses, or configuration data. Ruby Nil? \u2014 The Fundamental Absence nil? is a core Ruby method defined on Object. It returns &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d<\/span> \u3082\u3063\u3068\u8aad\u3080 \"<\/a><\/p>","protected":false},"author":11,"featured_media":40282,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1224],"tags":[],"class_list":["post-40205","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding Ruby Present?, Blank?, Nil?, and Empty?<\/title>\n<meta name=\"description\" content=\"Understand Ruby present?, blank?, nil?, and empty? methods to write cleaner, more reliable code by handling data presence effectively.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.railscarma.com\/ja\/\u30d6\u30ed\u30b0\/ruby\u3067\u7a7a\u767d\u306enil\u3068empty\u3092\u7406\u89e3\u3059\u308b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding Ruby Present?, Blank?, Nil?, and Empty?\" \/>\n<meta property=\"og:description\" content=\"Understand Ruby present?, blank?, nil?, and empty? 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