{"id":13000,"date":"2021-08-01T08:08:09","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=13000"},"modified":"2024-05-06T11:39:54","modified_gmt":"2024-05-06T02:39:54","slug":"%e3%81%97%e3%81%a3%e3%81%8b%e3%82%8a%e4%bd%bf%e3%81%84%e5%88%86%e3%81%91%ef%bc%81rails%e3%81%a7%e3%81%aefind-find_by%e3%81%ae%e6%a6%82%e8%a6%81%e3%80%81%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/13000","title":{"rendered":"\u3057\u3063\u304b\u308a\u4f7f\u3044\u5206\u3051\uff01Rails\u3067\u306efind, find_by\u306e\u9055\u3044\u3001\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f! \u30d5\u30ea\u30fc\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9577\u702c\u3067\u3059\u3002<\/p>\n<p>Rails\u3067\u306f\u3001ActiveRecord\u306b\u3088\u3063\u3066<span style=\"color: #0000ff;\"><strong>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30c7\u30fc\u30bf\u3092\u691c\u7d22<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3001\u4f3c\u305f\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u591a\u3044\u305f\u3081\u3001\u3069\u3046\u9055\u3046\u306e\u304b\u3001\u3069\u3046\u4f7f\u3044\u5206\u3051\u305f\u3089\u3044\u3044\u306e\u304b\u3063\u3066\u5206\u304b\u308a\u3065\u3089\u3044\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Raild\u306efind\/find_by\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066<\/p>\n<p><span style=\"color: #ff0000;\"><strong><strong>\u30fb Rails\u306efind\u306b\u3064\u3044\u3066<br \/>\n\u30fb Rails\u306efind_by\u306b\u3064\u3044\u3066<br \/>\n\u30fb \u691c\u7d22\u6761\u4ef6\u306e\u9055\u3044<br \/>\n\u30fb \u53d6\u5f97\u30c6\u3099\u30fc\u30bf\u6570\u306e\u9055\u3044<br \/>\n\u30fb \u691c\u7d22\u7d50\u679c\u304b\u3099\u306a\u3044\u5834\u5408\u306e\u6319\u52d5<\/strong><\/strong><\/span><\/p>\n<p>\u3092\u5b66\u7fd2\u3057\u305f\u5f8c<\/p>\n<p><span style=\"color: #ff0000;\"><strong><strong>\u30fb Ruby\u306efind\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306efind_all\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306eselect\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306eselect!\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306ereject\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306eany\u306b\u3064\u3044\u3066<br \/>\n\u30fb Ruby\u306eall\u306b\u3064\u3044\u3066<\/strong><\/strong><\/span><\/p>\n<p>\u3068\u3044\u3063\u305fRuby\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>Ruby\u306b\u3082find\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306e\u3067\u3001Rails\u306efind\u30e1\u30bd\u30c3\u30c9\u3068<span style=\"color: #ff0000;\"><strong>\u6df7\u540c\u3057\u306a\u3044\u3088\u3046<\/strong><\/span>\u306b\u5f8c\u534a\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h2>Rails\u306efind\u306b\u3064\u3044\u3066<\/h2>\n<p>find\u306f<span style=\"color: #ff0000;\"><strong>\u300cid\u300d<\/strong><\/span>\u306b\u3088\u3063\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>Rails\u3067\u306f\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u300cid\u300d\u30ab\u30e9\u30e0\u304c\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u3068\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u8ffd\u52a0\u3055\u308c\u308b\u305f\u3081\u3001\u7279\u306b\u4f55\u3082\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u306a\u304ffind\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u57fa\u672c\u5f62<\/h3>\n<p>\u57fa\u672c\u5f62\u306f\u3001\u30e2\u30c7\u30eb\u540d\u306bfind\u3092\u3064\u306a\u3052\u3066\u5f15\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u306b\u3088\u3063\u3066\u3001\u8a72\u5f53\u3059\u308b\u30e2\u30c7\u30eb\u306e\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u691c\u7d22\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre>\u30e2\u30c7\u30eb\u540d.find(*args)<\/pre>\n<p>\u6307\u5b9a\u3067\u304d\u308b\u5f15\u6570\u306f<\/p>\n<ul>\n<li><span style=\"color: #339966;\"><strong>\u6570\u5024\u578b<\/strong><\/span><\/li>\n<li><span style=\"color: #339966;\"><strong>\u6587\u5b57\u5217\u306e\u6570\u5b57<\/strong><\/span><\/li>\n<li><span style=\"color: #339966;\"><strong>\u6570\u5b57\u306e\u30ea\u30b9\u30c8<\/strong><\/span><\/li>\n<li><span style=\"color: #339966;\"><strong>\u6570\u5b57\u306e\u914d\u5217<\/strong><\/span><\/li>\n<\/ul>\n<p>\u306e4\u3064\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u8a72\u5f53\u3059\u308bid\u306e\u30c7\u30fc\u30bf\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f<span style=\"color: #ff0000; background-color: #ffff99;\"><strong>\u4f8b\u5916\uff08RecordNotFound\uff09\u304c\u767a\u751f<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n<h3>\u4f7f\u3044\u65b9<\/h3>\n<p>User\u30c6\u30fc\u30d6\u30eb\u306e\u4e2d\u304b\u3089id\u304c1\u306e\u30c7\u30fc\u30bf\u3092\u8fd4\u3059<\/p>\n<pre>\r\nUser.find(1)\r\n<\/pre>\n<p>\u6587\u5b57\u5217\u306e\u6570\u5b57\u3067\u3082\u6570\u5024\u578b\u306b\u5909\u63db\u3057\u3066\u304f\u308c\u308b\u306e\u3067\u3001\u691c\u7d22\u53ef\u80fd\u3002<\/p>\n<pre>\r\nUser.find(\"1\")\r\n<\/pre>\n<p>\u4f59\u8a08\u306a\u6587\u5b57\u5217\u304c\u5165\u3063\u3066\u3044\u3066\u3082\u3001\u4e00\u756a\u6700\u521d\u306b\u30de\u30c3\u30c1\u3057\u305f\u6587\u5b57\u6570\u5b57\u3092id\u3068\u3057\u3066\u691c\u7d22\u3057\u3066\u304f\u308c\u308b\u3002<\/p>\n<pre>\r\nUser.find(\"3-samurai\") # User\u30c6\u30fc\u30d6\u30eb\u306e\u4e2d\u304b\u3089id\u304c3\u306e\u30c7\u30fc\u30bf\u3092\u8fd4\u3059\r\n<\/pre>\n<p>\u30ea\u30b9\u30c8\u3067id\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306f\u30c7\u30fc\u30bf\u3092\u8907\u6570\u691c\u7d22\u3057\u3066\u3001\u914d\u5217\u3067\u8fd4\u3059\u3002<\/p>\n<pre>\r\nUser.find(1, 2, 6) # id\u304c1,2,6\u306e\u30c7\u30fc\u30bf\u3092\u305d\u308c\u305e\u308c\u691c\u7d22\u3057\u3066\u914d\u5217\u3067\u8fd4\u3059\r\n<\/pre>\n<p>\u914d\u5217\u3067\u3082\u6307\u5b9a\u53ef\u80fd\u3002<\/p>\n<pre>\r\nUser.find([7, 17, 20]) # id\u304c7,17,20\u306e\u30c7\u30fc\u30bf\u3092\u305d\u308c\u305e\u308c\u691c\u7d22\u3057\u3066\u914d\u5217\u3067\u8fd4\u3059\r\n<\/pre>\n<h2>Rails\u306efind_by\u306b\u3064\u3044\u3066<\/h2>\n<p>\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u30de\u30c3\u30c1\u3057\u305f\u6700\u521d\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u691c\u7d22\u3057\u307e\u3059\u3002<\/p>\n<p>\u53d6\u5f97\u3067\u304d\u308b\u30c7\u30fc\u30bf\u306f1\u4ef6\u306e\u307f\u3067\u3059\u3002<\/p>\n<p>\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u7279\u5b9a\u306e\u6761\u4ef6\u3067\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u306f\u3001where\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u7279\u5b9a\u306e\u6761\u4ef6\u3067\u691c\u7d22\u3092\u884c\u3044\u307e\u3059\u304c\u3001\u540c\u3058\u30c7\u30fc\u30bf\u304c\u8907\u6570\u3042\u308b\u3068\u304d\u306b\u3001\u9806\u5e8f\u304c\u91cd\u8981\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u5834\u5408\u306f\u3001order\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u306a\u3069\u3057\u3066\u81ea\u8eab\u3067\u30c7\u30fc\u30bf\u306e\u9806\u5e8f\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u57fa\u672c\u5f62<\/h3>\n<p>\u30e2\u30c7\u30eb\u540d\u306bfind_by\u30e1\u30bd\u30c3\u30c9\u3092\u3064\u306a\u3052\u3066\u5f15\u6570\u30921\u3064\u4ee5\u4e0a\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<pre>\u30e2\u30c7\u30eb\u540d.find_by(\u7279\u5b9a\u306e\u6761\u4ef6)<\/pre>\n<p>\u6307\u5b9a\u3067\u304d\u308b\u5f15\u6570\u306b\u306f<\/p>\n<ul>\n<li><span style=\"color: #339966;\"><strong>\u30ab\u30e9\u30e0\u540d<\/strong><\/span><\/li>\n<li><span style=\"color: #339966;\"><strong>\u691c\u7d22\u6761\u4ef6<\/strong><\/span><\/li>\n<\/ul>\n<p>\u306a\u3069\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001\u30c7\u30fc\u30bf\u304c\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306fnil\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<h3>\u4f7f\u3044\u65b9<\/h3>\n<p>User\u30c6\u30fc\u30d6\u30eb\u304b\u3089name\u30ab\u30e9\u30e0\u304c\u300c\u4f8d\u300d\u3068\u30de\u30c3\u30c1\u3057\u305f\u6700\u521d\u306e\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u3002<\/p>\n<pre>\r\nUser.find_by(name: '\u4f8d')\r\n<\/pre>\n<p>User\u30c6\u30fc\u30d6\u30eb\u304b\u3089name\u30ab\u30e9\u30e0\u304c\u4f8d\u3067\u3001\u304b\u3064\u7ba1\u7406\u8005(admin\u30ab\u30e9\u30e0\u304ctrue)\u3067\u3042\u308b\u6700\u521d\u306e\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u3002<\/p>\n<pre>\r\nUser.find_by(name: '\u4f8d', admin: true)\r\n<\/pre>\n<p>User\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u4f5c\u6210\u65e5\u304c1\u9031\u9593\u4ee5\u5185\u306e\u30c7\u30fc\u30bf\u30921\u4ef6\u53d6\u5f97\u3059\u308b\u3002<\/p>\n<pre>\r\nUser.find_by(\"created_at > ?\", 1.weeks.ago)\r\n<\/pre>\n<h2>\u4e21\u8005\u306e\u9055\u3044\u306b\u3064\u3044\u3066<\/h2>\n<h3>\u691c\u7d22\u6761\u4ef6\u306e\u9055\u3044<\/h3>\n<p>find\u306f\u691c\u7d22\u6761\u4ef6\u3068\u3057\u3066\u6307\u5b9a\u3067\u304d\u308b\u3082\u306e\u306f<span style=\"color: #ff0000;\"><strong>\u300cid\u306e\u307f\u300d<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>find_by\u306f\u3001\u8907\u6570\u306e\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u305f\u308aid\u4ee5\u5916\u306e\u30ab\u30e9\u30e0\u3067\u3082\u691c\u7d22\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u53d6\u5f97\u30c7\u30fc\u30bf\u6570\u306e\u9055\u3044<\/h3>\n<p>find\u306f\u30c7\u30fc\u30bf\u3092\u8907\u6570\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>find_by\u306f\u6700\u521d\u306b\u30de\u30c3\u30c1\u3057\u305f1\u4ef6\u306e\u307f\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u691c\u7d22\u7d50\u679c\u304c\u306a\u3044\u5834\u5408\u306e\u6319\u52d5<\/h3>\n<p><strong><br \/>\n\u30fbfind\u306f\u4f8b\u5916\u3092\u767a\u751f\u3055\u305b\u3066\u51e6\u7406\u3092\u4e2d\u65ad\u3057\u307e\u3059\u3002<\/p>\n<p>\u30fbfind_by\u306fnil\u3092\u8fd4\u3059\u305f\u3081\u51e6\u7406\u306f\u4e2d\u65ad\u3055\u308c\u307e\u305b\u3093\u3002<br \/>\n<\/strong>s<br \/>\nfind\u3067\u306f\u691c\u7d22\u3057\u305f\u7d50\u679c\u3001\u30c7\u30fc\u30bf\u306e\u6709\u7121\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u4f8b\u5916\u51e6\u7406\u3092\u4f7f\u3044\u691c\u7d22\u7d50\u679c\u304c0\u4ef6\u306e\u5834\u5408\u306b<span style=\"color: #ff0000;\"><strong>\u51e6\u7406\u3092\u307e\u3068\u3081\u3066\u66f8\u304f\u3053\u3068\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>find\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3057\u305f\u5f8c\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u3042\u3063\u305f\u5834\u5408\u306b\u30a8\u30e9\u30fc\u30da\u30fc\u30b8\u3092\u8868\u793a\u3059\u308b\u3001root\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3055\u305b\u308b\u306a\u3069\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\uff08\u4f8b\uff1a\u30e6\u30fc\u30b6\u30fc\u304c\u30b5\u30fc\u30d3\u30b9\u3092\u9000\u4f1a\u3057\u3066\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3055\u308c\u305f\u3042\u3068\u306b\u3001\u81ea\u5206\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30da\u30fc\u30b8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u304d\u305f\u5834\u5408\uff09<\/p>\n<p>id\u4ee5\u5916\u306e\u691c\u7d22\u6761\u4ef6\u30671\u4ef6\u306e\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u305f\u3044\u5834\u5408\u3001\u307e\u305f\u306f\u691c\u7d22\u30c7\u30fc\u30bf\u306e\u6709\u7121\u306b\u3088\u3063\u3066\u7279\u5225\u306a\u51e6\u7406\u3092\u3057\u305f\u3044\u5834\u5408\u306ffind_by\u3092\u4f7f\u3046\u3088\u3046\u306b\u3059\u308b\u3068\u3044\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u306a\u304a\u3001where\u306f\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u691c\u7d22\u3057\u305f\u5834\u5408\u3001<span style=\"color: #ff0000;\"><strong>\u3088\u308a\u8907\u96d1\u306a\u691c\u7d22\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408<\/strong><\/span>\u306b\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>where\u306e\u4f7f\u3044\u65b9\u306f\u3053\u3061\u3089\u3067\u89e3\u8aac\u3057\u3066\u3042\u308b\u306e\u3067\u3001where\u306b\u3064\u3044\u3066\u4e0d\u5b89\u304c\u3042\u308b\u4eba\u306f\u4e00\u8aad\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<br \/>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/13363\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2016\/12\/rails_where-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u30b9\u30de\u30fc\u30c8\u306b\u691c\u7d22\uff01Rails\u306ewhere\u4f7f\u3044\u65b9\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            <\/p>\n<h2>Ruby\u306e\u30e1\u30bd\u30c3\u30c9<\/h2>\n<p>\u3053\u3053\u304b\u3089\u306fRails\u3067\u306f\u306a\u304f\u3066\u3001Ruby\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>Rails\u306efind\u3001find_by\u30e1\u30bd\u30c3\u30c9\u3068\u306f<span style=\"color: #ff0000;\"><strong>\u4f3c\u3066\u975e\u306a\u308b\u3082\u306e<\/strong><\/span>\u306a\u306e\u3067\u3001\u6df7\u540c\u3057\u306a\u3044\u3088\u3046\u306b\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>Ruby\u306efind\u306b\u3064\u3044\u3066<\/h3>\n<p><span style=\"color: #339966;\"><strong>Rails\u306efind\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u306f\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u7279\u5b9a\u306eid\u3092\u6307\u5b9a\u3057\u3066\u3001\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u3082\u306e\u3067\u3057\u305f\u304c\u3001Ruby\u3067\u306efind\u30e1\u30bd\u30c3\u30c9\u306f<span style=\"color: #0000ff;\"><strong>\u6761\u4ef6\u306b\u3088\u3063\u3066\u914d\u5217\u306b\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u304b\u3051\u308b<\/strong><\/span>\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<p>\u7279\u306bRuby\u306efind\u30e1\u30bd\u30c3\u30c9\u306f\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u305f<span style=\"color: #ff0000;\"><strong>\u59cb\u3081\u306e\u8981\u7d20\u30921\u3064\u3060\u3051<\/strong><\/span>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3,4,5]\r\np array.find{|num| num > 2}\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\n3 \r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u6761\u4ef6\u306b\u5f93\u3063\u3066\u3001<span style=\"color: #ff0000;\"><strong>find\u306f\u5148\u982d\u306e\u8981\u7d20\u3060\u3051<\/strong><\/span>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u306f1\u301c5\u306e\u6570\u5b57\u306e\u4e2d\u304b\u3089\u3001<span style=\"color: #0000ff;\"><strong>2\u3088\u308a\u5927\u304d\u304b\u3063\u305f1\u756a\u59cb\u3081\u306e\u6570\u5b573<\/strong><\/span>\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>Ruby\u306efind_all\u306b\u3064\u3044\u3066<\/h3>\n<p>Ruby\u306b\u306ffind\u30e1\u30bd\u30c3\u30c9\u306e\u4ed6\u306b<span style=\"color: #339966;\"><strong>find_all\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u3061\u3089\u306f\u3001\u5b9f\u306f\u5f8c\u8ff0\u3059\u308b<span style=\"color: #339966;\"><strong>select\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3068\u5168\u304f\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<p>\u3055\u304d\u307b\u3069\u306efind\u30e1\u30bd\u30c3\u30c9\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3057\u305f1\u756a\u59cb\u3081\u306e\u8981\u7d20\u3092\u8fd4\u3057\u305f\u306e\u306b\u5bfe\u3057\u3066\u3001find_all\u30e1\u30bd\u30c3\u30c9\u306fall\u306e\u540d\u524d\u306e\u901a\u308a\u3001<span style=\"color: #ff0000;\"><strong>\u6761\u4ef6\u3092\u6e80\u305f\u3059\u3059\u3079\u3066\u306e\u8981\u7d20<\/strong><\/span>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3,4,5]\r\np array.find_all{|num | num > 2}\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\n[3,4,5]\r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f2\u4ee5\u4e0a\u3067\u3042\u308b\u914d\u5217\u306e\u8981\u7d20<span style=\"color: #0000ff;\"><strong>\u3059\u3079\u3066\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/strong><\/span><\/p>\n<h3>Ruby\u306eselect\u306b\u3064\u3044\u3066<\/h3>\n<p>Ruby\u306eselect\u30e1\u30bd\u30c3\u30c9\u306f\u5148\u307b\u3069\u7d39\u4ecb\u3057\u305ffind_all\u30e1\u30bd\u30c3\u30c9\u3068\u307e\u3063\u305f\u304f\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n<p>\u306a\u306e\u3067\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u914d\u5217\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>array = [1,2,3,4,5]\r\np array.select { |num| num > 3 }\r\np array.select { |num| num == 3 }\r\np array.select { |num| num <= 3 }\r\n\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\n[4, 5]\r\n[3]\r\n[1, 2, 3]<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b<br \/>\n<strong><br \/>\n\u30fb1\u756a\u76ee\u3067\u306f3\u4ee5\u4e0a<br \/>\n\u30fb2\u756a\u76ee\u306f3\u3068\u5b8c\u5168\u306b\u4e00\u81f4\u3057\u305f\u3082\u306e<br \/>\n\u30fb3\u756a\u76ee\u306f3\u4ee5\u4e0b\u3068\u3044\u3046\u6761\u4ef6\u3092\u6e80\u305f\u3057\u305f\u3082\u306e<\/strong><\/p>\n<p>\u3092\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>Ruby\u306eselect!\u306b\u3064\u3044\u3066<\/h3>\n<p>select!\u30e1\u30bd\u30c3\u30c9\u306f\u3001select\u30e1\u30bd\u30c3\u30c9\u3092\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306b\u3057\u305f\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u306eselect\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u30ec\u30b7\u30fc\u30d0\u30fc(\u5143\u306e\u914d\u5217)\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001select!\u30e1\u30bd\u30c3\u30c9\u306f<span style=\"color: #ff0000;\"><strong>\u5143\u306e\u914d\u5217\u306b\u5909\u66f4\u3092\u52a0\u3048\u307e\u3059\u3002<\/strong><\/span><\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3,4,5]\r\narray.select! {|num| num > 3} \r\np array \r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\n[4,5]\r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5143\u306e\u914d\u5217\u306f[1,2,3,4,5]\u3067\u3057\u305f\u304c\u3001select!\u30e1\u30bd\u30c3\u30c9\u3067\u8fd4\u3063\u305f\u7d50\u679c\u306b\u5909\u66f4\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>Ruby\u306ereject\u306b\u3064\u3044\u3066<\/h3>\n<p>find_all\/select\u306e\u6761\u4ef6\u3092\u53cd\u8ee2\u3055\u305b\u305f<span style=\"color: #339966;\"><strong>reject\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u5c11\u3057\u3084\u3084\u3053\u3057\u3044\u8868\u73fe\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u6307\u5b9a\u3057\u305f<span style=\"color: #ff0000;\"><strong>\u6761\u4ef6\u4ee5\u5916\u306e\u3082\u306e<\/strong><\/span>\u3067\u914d\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3,4,5]\r\np array.reject{|num| num > 3}\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\n[1, 2, 3]\r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u30013\u3088\u308a\u3082\u5927\u304d\u306a\u6570\u5b57\u3068\u3044\u3046<span style=\"color: #ff0000;\"><strong>\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u306a\u3044<\/strong><\/span>\u3082\u306e\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u30013\u3088\u308a\u3082\u5927\u304d\u304f\u306a\u3044\u6570\u5b57\u3067\u3059\u3002<\/p>\n<h3>Ruby\u306eany\u306b\u3064\u3044\u3066<\/h3>\n<p>Ruby\u306eany\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306e\u4e2d\u306b\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u3066\u3044\u308b\u3082\u306e\u304c<span style=\"color: #0000ff;\"><strong>1\u3064\u3067\u3082\u3042\u308c\u3070\u3001true\u3092\u8fd4\u3057<\/strong><\/span>\u3001<span style=\"color: #ff0000;\"><strong>1\u3064\u3082\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306ffalse\u3092\u8fd4\u3057<\/strong><\/span>\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3]\r\narray.any?{|a| a > 2}\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\ntrue\r\n<\/pre>\n<p>\u3053\u306e\u5834\u54082\u4ee5\u4e0a\u306e\u6570\u5024\u3067\u3042\u308b3\u304c\u914d\u5217array\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u306e\u3067\u3001true\u304c\u8fd4\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>Ruby\u306eall\u306b\u3064\u3044\u3066<\/h3>\n<p>Ruby\u306eall\u30e1\u30bd\u30c3\u30c9\u306fany\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u5bfe\u7167\u7684\u306b\u3001\u914d\u5217\u306e<span style=\"color: #ff0000;\"><strong>\u3059\u3079\u3066\u306e\u8981\u7d20\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u6642\u306btrue\u3092\u8fd4\u3057<\/strong><\/span>\u3001\u305d\u308c\u4ee5\u5916\u306e\u3068\u304d\u306ffalse\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre>\r\narray = [1,2,3]\r\narray.all?{|a| a > 2}\r\n<\/pre>\n<p><strong>[\u5b9f\u884c\u7d50\u679c]<\/strong><\/p>\n<pre>\r\nfalse\r\n<\/pre>\n<p>any\u306e\u5834\u5408\u3068\u540c\u3058\u6761\u4ef6\u5f0f\u3067\u3059\u304c\u3001\u898b\u3066\u306e\u901a\u308a2\u4ee5\u4e0a\u306e\u3082\u306e\u306f\u3059\u3079\u3066\u3067\u306f\u306a\u3044\u306e\u3067\u3001false\u304c\u8fd4\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Rails\u306efind\/find_by\u30e1\u30bd\u30c3\u30c9\u3092\u4e3b\u306b\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>Rails\u306e<span style=\"color: #339966;\"><strong>find\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u306f\u3001id\u3092\u6307\u5b9a\u3057\u3066\u30e2\u30c7\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u3001<span style=\"color: #339966;\"><strong>find_by\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u306f\u4efb\u610f\u306e\u6761\u4ef6\u306b\u3088\u3063\u3066\u6700\u521d\u306b\u30de\u30c3\u30c1\u3057\u305f1\u4ef6\u3092\u53d6\u5f97\u3067\u304d\u308b\u306e\u3067\u3057\u305f\u306d\u3002<\/p>\n<p>find\u30e1\u30bd\u30c3\u30c9\u306f\u4f8b\u5916\u3092\u767a\u751f\u3055\u305b\u3066\u3001find_by\u30e1\u30bd\u30c3\u30c9\u306fnil\u3092\u8fd4\u3059\u3068\u3044\u3046\u3053\u3068\u3082\u91cd\u8981\u306a\u9055\u3044\u306a\u306e\u3067\u3057\u3063\u304b\u308a\u3068\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001find\u30e1\u30bd\u30c3\u30c9\u306b\u3061\u306a\u3093\u3067\u3001Ruby\u306efind\u30e1\u30bd\u30c3\u30c9\u3084\u305d\u306e\u4ed6\u306e\u95a2\u9023\u6027\u306e\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>Rails\u306f\u3044\u3046\u307e\u3067\u3082\u306a\u304f\u3001\u300cRuby\u300d\u3067\u4f5c\u3089\u308c\u3066\u3044\u308b\u306e\u3067<span style=\"color: #0000ff;\"><strong>\u3001Ruby\u306e\u57fa\u790e\u3082\u610f\u6b32\u7684\u306b\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/strong><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f! \u30d5\u30ea\u30fc\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u9577\u702c\u3067\u3059\u3002 Rails\u3067\u306f\u3001ActiveRecord\u306b\u3088\u3063\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u30c7\u30fc\u30bf\u3092\u691c\u7d22\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u305f\u3060\u3001\u4f3c\u305f\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u591a\u3044\u305f\u3081\u3001\u3069\u3046\u9055\u3046\u306e\u304b\u3001\u3069\u3046\u4f7f\u3044\u5206\u3051\u305f\u3089\u3044\u3044\u306e\u304b\u3063\u3066 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":40097,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2352],"tags":[],"class_list":["post-13000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby-study"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3057\u3063\u304b\u308a\u4f7f\u3044\u5206\u3051\uff01Rails\u3067\u306efind, find_by\u306e\u9055\u3044\u3001\u4f7f\u3044\u65b9 | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3057\u3063\u304b\u308a\u4f7f\u3044\u5206\u3051\uff01Rails\u3067\u306efind, find_by\u306e\u9055\u3044\u3001\u4f7f\u3044\u65b9 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