{"height":"190","type":"rich","description":"DataMapper \u3067\u306e One-To-Many-Through - daily dayflower \u306e\u7d9a\u304d\u3002\u4e0b\u8a18\u306f\u3042\u304f\u307e\u3067\u8aac\u660e\u306e\u305f\u3081\u306e\u30b5\u30f3\u30d7\u30eb((\u307e\u3058\u3081\u306b\u30a2\u30d7\u30ea\u3068\u3057\u3066\u30a4\u30f3\u30d7\u30ea\u30e1\u30f3\u30c8\u3059\u308b\u306a\u3089\uff0c\u5358\u306b User \u3084 Mail \u30e2\u30c7\u30eb\u306b\u524a\u9664\u30d5\u30e9\u30b0\uff08\u3068\u3044\u3046\u304b available \u30d5\u30a3\u30fc\u30eb\u30c9\uff1f\uff09\u3092\u7528\u610f\u3057\u3066\u305d\u3053\u3092\u64cd\u4f5c\u3059\u308b\u3060\u3051\u306b\u3059\u308b\u3068\u601d\u3046\u3002))\u3002 \u5358\u7d14\u306a One-To-Many (belongs_to \u3068 has n) \u306e\u5834\u5408 require 'rubygems' require 'dm-core' require 'dm-aggregates' # Collection \u306e count() \u7b49\u3092\u3042\u3068\u3067\u4f7f\u2026","blog_url":"https://dayflower.hatenablog.com/","provider_name":"Hatena Blog","width":"100%","published":"2009-11-10 15:23:55","url":"https://dayflower.hatenablog.com/entry/20091110/1257834235","author_url":"https://blog.hatena.ne.jp/dayflower/","categories":["ruby","memo"],"blog_title":"daily dayflower","title":" DataMapper \u3067\u306e Associations \u306b Hook \u3092\u304b\u3089\u307e\u305b\u308b","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fdayflower.hatenablog.com%2Fentry%2F20091110%2F1257834235\" title=\" DataMapper \u3067\u306e Associations \u306b Hook \u3092\u304b\u3089\u307e\u305b\u308b - daily dayflower\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","version":"1.0","image_url":null,"author_name":"dayflower","provider_url":"https://hatena.blog"}