{"blog_url":"https://mtoyoshi.hateblo.jp/","url":"https://mtoyoshi.hateblo.jp/entry/20090426/1240741367","author_name":"mtoyoshi","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fmtoyoshi.hateblo.jp%2Fentry%2F20090426%2F1240741367\" title=\"Relationships - mtoyoshi\u958b\u767a\u30e1\u30e2\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_title":"mtoyoshi\u958b\u767a\u30e1\u30e2","width":"100%","author_url":"https://blog.hatena.ne.jp/mtoyoshi/","title":"Relationships","height":"190","type":"rich","published":"2009-04-26 19:22:47","provider_name":"Hatena Blog","categories":["GAE/J"],"provider_url":"https://hatena.blog","image_url":null,"description":"\u6c38\u7d9a\u5316\u306b\u95a2\u3057\u3066\u52c9\u5f37\u3057\u3088\u3046\u3068\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u3093\u3067\u307f\u305f\u3002 \u7279\u306b\u95a2\u9023\u306b\u95a2\u3057\u3066\u306f\u3001List\u578b\u306e\u30e1\u30f3\u30d0\u306b\u5bfe\u3057\u3066Persistent\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u4e0e\u3059\u308b\u3068one-to-many\u306b\u306a\u308b\u3002hibernate\u3042\u305f\u308a\u3092\u5229\u7528\u3057\u305f\u3053\u3068\u304c\u3042\u308b\u4eba\u3067\u3042\u308c\u3070\u3059\u3093\u306a\u308a\u7406\u89e3\u3067\u304d\u308b\u3068\u601d\u3046\u3002 \u3057\u304b\u3057\u306a\u304c\u3089\u3001 App Engine does not support join queries: you cannot query a parent entity using an attribute of a child entity. \u3068\u3042\u308a\u3001\u7d50\u5408\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u3002\u3002\u305f\u3060\u3057\u3001 You can query a property o\u2026"}