{"blog_title":"\u30d1\u30d1\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u5e33","published":"2018-11-27 12:58:19","provider_name":"Hatena Blog","description":"Rails\u3067has_many :comments\u307f\u306a\u3044\u306a\u6642\u306bbuild\u3059\u308b\u3068\u304d\u306f@blog.comments.build\u3060\u3051\u3069\u3001has_one\u306e\u5834\u5408\u306f.build\u306fnil\u30a8\u30e9\u30fc\u306b\u306a\u308b\u3002 has_one\u306e\u5834\u5408\u306fbuild_xxx\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u306e\u3067\u3001\u305d\u3061\u3089\u3092\u4f7f\u3046\u3068\u8a00\u3046\u3053\u3068\u3092\u4eca\u9803\u306b\u306a\u3063\u3066\u77e5\u3063\u305f\u3002 class Blog has_one :star end @blog = Blog.new # @blog.star.build \u2192nil\u30a8\u30e9\u30fc\u306b\u306a\u308b @blog.build_star","categories":["Rails","has_one"],"height":"190","author_url":"https://blog.hatena.ne.jp/masaru_tech/","url":"https://masaru-tech.hateblo.jp/entry/2018/11/27/125819","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmasaru-tech.hateblo.jp%2Fentry%2F2018%2F11%2F27%2F125819\" title=\"has_one\u306ebuild\u306fhas_many\u3068\u9055\u3046 - \u30d1\u30d1\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u5e33\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://masaru-tech.hateblo.jp/","width":"100%","provider_url":"https://hatena.blog","image_url":null,"title":"has_one\u306ebuild\u306fhas_many\u3068\u9055\u3046","author_name":"masaru_tech","type":"rich","version":"1.0"}