{"id":319,"date":"2016-11-18T12:32:11","date_gmt":"2016-11-18T03:32:11","guid":{"rendered":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/11\/18\/how_I_screwed_up"},"modified":"2022-10-28T21:55:36","modified_gmt":"2022-10-28T12:55:36","slug":"how_i_screwed_up","status":"publish","type":"post","link":"https:\/\/p-corporate-blog-cms.mmmcorp.co.jp\/blog\/2016\/11\/18\/how_i_screwed_up\/","title":{"rendered":"\u30b5\u30fc\u30d3\u30b9\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u6642\u306b\u7d4c\u9a13\u3057\u305f\u5931\u6557\u8ac7"},"content":{"rendered":"<p>\u524d\u7530\u3067\u3059\u3002<br \/>\n\u5e74\u672b\u306b\u5411\u3051\u3066\u5fd9\u3057\u304f\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u304c\u7686\u3055\u3093\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u5148\u65e5\u3001\u53d7\u8a17\u3057\u3066\u3044\u308bWeb\u30b5\u30fc\u30d3\u30b9\u306e\u5927\u5e45\u306a\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u3092\u5f0a\u793e\u3067\u5b9f\u65bd\u3057\u307e\u3057\u305f\u3002<br \/>\n\u305d\u306e\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u4f5c\u696d\u6642\u306b\u906d\u9047\u3057\u305f\u5931\u6557\u3068\u53cd\u7701\u3092\u5171\u6709\u3055\u305b\u3066\u9802\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<h2 id=\"outline__1\" id=\"\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u306e\u6982\u8981\">\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u306e\u6982\u8981<\/h2>\n<p>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u306f\u4e00\u822c\u7684\u306aCtoC\u306eWeb\u30b5\u30fc\u30d3\u30b9\u3067\u3057\u305f\u3002<br \/>\n\u65e2\u5b58\u3067PHP\u306eSlim\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u3001Rails\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u3044\u3046\u96e3\u6613\u5ea6\u306e\u9ad8\u3044\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3057\u305f\u3002<\/p>\n<p>\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u306e\u5185\u5bb9\u306f\u4e3b\u306b\u4e0b\u8a18\u306e3\u3064\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u65e2\u5b58\u306e\u30a4\u30f3\u30d5\u30e9\u3084\u958b\u767a\u74b0\u5883\u3092\u898b\u76f4\u3057\u3001\u518d\u69cb\u7bc9\u51fa\u6765\u308b\u3088\u3046\u306b\u30a4\u30f3\u30d5\u30e9\u306e\u30b3\u30fc\u30c9\u5316(Chef)\u3084CI\u3092\u5229\u7528\u3057\u305f\u7d99\u7d9a\u7684\u30c7\u30d7\u30ed\u30a4\u304c\u51fa\u6765\u308b\u3088\u3046\u6539\u5584<\/li>\n<li>PHP\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u30ed\u30b8\u30c3\u30af\u3092Rails\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u5b9f\u88c5\u3059\u308b<\/li>\n<li>\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u306eDB\u306b\u6700\u9069\u5316\u3057\u3066\u79fb\u884c\u3059\u308b<\/li>\n<\/ul>\n<h2 id=\"outline__2\" id=\"\u5f53\u65e5\u306e\u30c7\u30fc\u30bf\u79fb\u884c\u624b\u9806\">\u5f53\u65e5\u306e\u30c7\u30fc\u30bf\u79fb\u884c\u624b\u9806<\/h2>\n<p>\u5f53\u65e5\u306e\u30ea\u30d7\u30ec\u30a4\u30b9\u4f5c\u696d\u306f\u30b5\u30fc\u30d3\u30b9\u306e\u7a3c\u50cd\u5e2f\u57df\u304c\u5c11\u306a\u3044\u6df1\u591c\u306b\u884c\u3044\u307e\u3057\u305f\u3002<br \/>\n\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30c7\u30d7\u30ed\u30a4\u3084\u30a4\u30f3\u30d5\u30e9\u306e\u69cb\u7bc9\u306f\u305d\u306e\u6642\u70b9\u3067\u306f\u3059\u3067\u306b\u5b9f\u65bd\u6e08\u307f\u3060\u3063\u305f\u306e\u3067\u3001\u4e3b\u306a\u4f5c\u696d\u306f\u30c7\u30fc\u30bf\u79fb\u884c\u95a2\u4fc2\u3067\u3059\u3002<\/p>\n<p>\u30c7\u30fc\u30bf(DB)\u79fb\u884c\u306e\u3056\u304f\u3063\u3068\u3057\u305f\u624b\u9806\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>\u65e2\u5b58\u74b0\u5883\u3067\u30c0\u30f3\u30d7\u30c7\u30fc\u30bf\u3092\u53d6\u308b(\u591a\u5c11\u30c7\u30fc\u30bf\u3092\u6574\u5f62)<\/li>\n<li>\u30c0\u30f3\u30d7\u30c7\u30fc\u30bf\u3092\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u74b0\u5883\u306b\u6301\u3063\u3066\u3044\u304f<\/li>\n<li>\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u74b0\u5883\u306b\u7528\u610f\u3057\u3066\u3044\u305f\u30c7\u30fc\u30bf\u79fb\u884c\u7528\u306e\u30c6\u30f3\u30dd\u30e9\u30eaDB\u306b\u30c0\u30f3\u30d7\u30c7\u30fc\u30bf\u3092\u6d41\u3057\u3053\u3080<\/li>\n<li>\u30c6\u30f3\u30dd\u30e9\u30eaDB\u304b\u3089\u672c\u756aDB\u306b\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1(ruby)\u3067\u30c7\u30fc\u30bf\u3092\u6d41\u3057\u8fbc\u3080<\/li>\n<\/ol>\n<p><img src=\"\/images\/how_I_screwed_up\/move_data.png\" alt=\"\"><\/p>\n<p>\u3053\u306e<strong>4<\/strong>\u306e\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\u306e\u4f5c\u6210\u306f\u4e3b\u306b\u79c1\u304c\u62c5\u5f53\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2 id=\"outline__3\" id=\"\u5bfe\u8c61\u30c7\u30fc\u30bf\u306e\u6982\u8981\">\u5bfe\u8c61\u30c7\u30fc\u30bf\u306e\u6982\u8981<\/h2>\n<p>\u79fb\u884c\u3057\u305f\u304b\u3063\u305f\u30c7\u30fc\u30bf\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30e6\u30fc\u30b6\u30fc<\/li>\n<li>\u30a2\u30a4\u30c6\u30e0<\/li>\n<li>\u30e6\u30fc\u30b6\u30fc\u306e\u304a\u6c17\u306b\u5165\u308a\u30a2\u30a4\u30c6\u30e0<\/li>\n<\/ul>\n<p><img src=\"\/images\/how_I_screwed_up\/model.png\" alt=\"\"><\/p>\n<p>\u305d\u3057\u3066\u3001\u300c\u30a2\u30a4\u30c6\u30e0\u306e\u304a\u6c17\u306b\u5165\u308a\u6570\u304c\u591a\u3044\u9806\u306b\u30bd\u30fc\u30c8\u3059\u308b\u300d\u3068\u3044\u3046\u8981\u4ef6\u3092\u6e80\u305f\u3059\u70ba\u3001\u30a2\u30a4\u30c6\u30e0\u306b\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u304a\u6c17\u306b\u5165\u308a\u6570\u3092\u6301\u3064\u30ab\u30e9\u30e0(favorite_count)\u3092\u6301\u305f\u305b\u307e\u3057\u305f\u3002<br \/>\nFavoriteUserItem\u30e2\u30c7\u30eb\u306b\u306f\u3001\u30ec\u30b3\u30fc\u30c9\u304c\u4f5c\u6210\u3055\u308c\u305f\u6642\u306bItem\u306e<code>favorite_count<\/code>\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\u30fb\u30c7\u30af\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u3088\u3046\u306b\u3001<code>counter_cache<\/code>\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u3057\u3066\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u884c\u3063\u305f\u6642\u306b\u8d77\u3053\u3063\u305f\u30a2\u30af\u30b7\u30c7\u30f3\u30c8\u306f\u3001\u3053\u306e<strong>favorite_count\u304c\u79fb\u884c\u3055\u308c\u306a\u3044<\/strong>\u3068\u3044\u3046\u30c8\u30e9\u30d6\u30eb\u3067\u3057\u305f\u3002<br \/>\n\u5b9f\u306f\u3001\u65e2\u5b58\u306e\u30c7\u30fc\u30bf\u3067FavoriteUserItem\u306e\u30ec\u30b3\u30fc\u30c9\u6570\u3068\u3001Item\u30e2\u30c7\u30eb\u306e<code>favorite_count<\/code>\u306e\u6574\u5408\u6027\u304c\u53d6\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3060\u3063\u305f\u306e\u3067\u3001\u30c7\u30fc\u30bf\u79fb\u884c\u6642\u306b<code>counter_cache<\/code>\u3092\u4f7f\u7528\u3057\u3066\u3001\u304d\u3061\u3093\u3068\u3057\u305f\u30c7\u30fc\u30bf\u306b\u3059\u308b\u4e88\u5b9a\u3067\u3057\u305f\u3002<\/p>\n<h2 id=\"outline__4\" id=\"\u30d0\u30b0\u304c\u767a\u751f\u3057\u305f\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\">\u30d0\u30b0\u304c\u767a\u751f\u3057\u305f\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1<\/h2>\n<p>\u5f53\u521d\u5b9f\u88c5\u3057\u3066\u3044\u305f\u30c7\u30fc\u30bf\u79fb\u884c\u30b3\u30fc\u30c9\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3067\u3057\u305f\u3002<br \/>\n\u203b FavoriteUserItemOld\u306f\u3001\u79fb\u884c\u5143\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3060ActiveRecord\u306e\u30af\u30e9\u30b9<\/p>\n<p><strong>\u521d\u671f\u72b6\u614b\u306e\u30b3\u30fc\u30c9<\/strong><\/p>\n<pre><code>FavoriteUserItemOld.each do |f|\n  FavoriteUserItem.create(user_id: f.user_id, item_id: f.item_id)\nend<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u306e\u307e\u307e\u3067\u3042\u308c\u3070\u554f\u984c\u7121\u304f\u30c7\u30fc\u30bf\u79fb\u884c\u3067\u304d\u305f\u306e\u3067\u3059\u304c\u3002\u3002<br \/>\n\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u306e\u6570\u65e5\u524d\u306b\u3001\u79c1\u304c\u3053\u3093\u306a\u6539\u4fee\u3092\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<\/p>\n<p><strong>\u6539\u4fee\u5f8c\u306e\u30b3\u30fc\u30c9<\/strong><\/p>\n<pre><code>ary = []\nFavoriteUserItemOld.each do |f|\n  ary &lt;&lt; FavoriteUserItem.new(user_id: f.user_id, item_id: f.item_id)\nend\nFavoriteUserItem.import ary<\/code><\/pre>\n<p>\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\u304c\u3053\u306e\u30dd\u30a4\u30f3\u30c8\u3067\u5927\u5e45\u306b\u6642\u9593\u3092\u30ed\u30b9\u3057\u3066\u3044\u305f\u306e\u3067\u3001\u3059\u3067\u306b\u5c0e\u5165\u3057\u3066\u3044\u305f\u30d0\u30eb\u30af\u30a4\u30f3\u30b5\u30fc\u30c8\u3092\u3059\u308bgem(activerecord-import)\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d0\u30eb\u30af\u30a4\u30f3\u30b5\u30fc\u30c8\u3092\u3059\u308b\u51e6\u7406\u306b\u5909\u3048\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n<p>\u30d0\u30eb\u30af\u30a4\u30f3\u30b5\u30fc\u30c8\u3092\u3059\u308b\u3068\u3001\u5f53\u7136ActiveRecord\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u30ad\u30e3\u30c3\u30b7\u30e5\u6a5f\u80fd\u306f\u4f7f\u7528\u51fa\u6765\u306a\u3044\u8a33\u3067\u3002\u3002<br \/>\n\u30c7\u30fc\u30bf\u79fb\u884c\u3057\u305f\u5f8c\u306b\u3001\u300c\u3042\u308c\uff1f\u30a2\u30a4\u30c6\u30e0\u306efavorite_count(\u304a\u6c17\u306b\u5165\u308a\u6570)\u304c\u79fb\u884c\u3055\u308c\u3066\u3044\u306a\u3044\u305e\uff1f\u300d\u3068\u306a\u3063\u305f\u8a33\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u306b\u6c17\u4ed8\u304d\u3001\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\u3092\u3059\u3050\u306b\u4fee\u6b63\u3057\u3066\u518d\u5ea6\u30c7\u30fc\u30bf\u79fb\u884c\u3092\u6d41\u3057\u76f4\u3057\u307e\u3057\u305f\u304c\u3001\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\u81ea\u4f53\u306b\u7d50\u69cb\u6642\u9593\u3092\u8981\u3059\u308b\u306e\u3067\u3001\u5927\u5e45\u306b\u6642\u9593\u3092\u30ed\u30b9\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002\u3002<\/p>\n<h2 id=\"outline__5\" id=\"\u306a\u305c\u3053\u306e\u554f\u984c\u304c\u8d77\u3053\u3063\u305f\">\u306a\u305c\u3053\u306e\u554f\u984c\u304c\u8d77\u3053\u3063\u305f?<\/h2>\n<p>\u30d0\u30eb\u30af\u30a4\u30f3\u30b5\u30fc\u30c8\u3092\u3059\u308b\u51e6\u7406\u306b\u30b3\u30fc\u30c9\u3092\u6539\u4fee\u3057\u3066\u3057\u307e\u3063\u305f\u304b\u3089\u3067\u3059\u304c\u3001\u305d\u306e\u6539\u4fee\u3092\u3057\u3066\u3057\u307e\u3063\u305f\u306e\u306f<strong>\u30ab\u30a6\u30f3\u30bf\u30fc\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u8a8d\u8b58\u304c\u629c\u3051\u843d\u3061\u3066\u3044\u305f\u304b\u3089<\/strong>\u3001\u3067\u3059\u3002<\/p>\n<p>\u521d\u671f\u72b6\u614b\u306e\u30b3\u30fc\u30c9\u3082\u79c1\u304c\u5b9f\u88c5\u3057\u305f\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u6642\u306f\u5f53\u7136\u30ab\u30a6\u30f3\u30bf\u30fc\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3057\u3066\u3001favorite_count\u306b\u5024\u3092\u5165\u308c\u308b\u3001\u3068\u3044\u3046\u3057\u3063\u304b\u308a\u3068\u3057\u305f\u76ee\u7684\u3092\u6301\u3063\u3066\u305d\u306e\u3088\u3046\u306b\u8a2d\u8a08\u30fb\u5b9f\u88c5\u3057\u307e\u3057\u305f\u3002<br \/>\n\u3057\u304b\u3057\u3001\u6642\u304c\u7d4c\u904e\u3057\u3066\u540c\u3058\u30b3\u30fc\u30c9\u3092\u898b\u305f\u6642\u306b\u305d\u306e\u3053\u3068\u3092\u3059\u3063\u304b\u308a\u5fd8\u308c\u3066\u3057\u307e\u3063\u3066\u3001\u30c7\u30fc\u30bf\u79fb\u884c\u30d0\u30c3\u30c1\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u77ed\u7e2e\u3057\u305f\u3044\u3001\u3068\u3044\u3046\u5b89\u6613\u306a\u76ee\u7684\u306e\u70ba\u306b\u6539\u4fee\u3057\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n<p>\u3067\u3059\u306e\u3067\u3001\u30d0\u30c3\u30c1\u306e\u30b3\u30fc\u30c9\u306b\u4e00\u8a00\u30b3\u30e1\u30f3\u30c8<strong>\u300c\u30ab\u30a6\u30f3\u30bf\u30fc\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3057\u3066\u3001Item\u306efavorite_count\u3092\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u3057\u3066\u3044\u307e\u3059\u300d<\/strong>\u3068\u3044\u3063\u305f\u5185\u5bb9\u306e\u30b3\u30e1\u30f3\u30c8\u304c\u3042\u308c\u3070\u3001\u521d\u671f\u30b3\u30fc\u30c9\u304b\u3089\u6539\u4fee\u306f\u3057\u306a\u304b\u3063\u305f\u8a33\u3067\u3059\u3002<br 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