{"author_url":"https://blog.hatena.ne.jp/kamatimaru/","provider_url":"https://hatena.blog","blog_url":"https://kamatimaru.hatenablog.com/","url":"https://kamatimaru.hatenablog.com/entry/2026/01/03/220307","published":"2026-01-03 22:03:07","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkamatimaru.hatenablog.com%2Fentry%2F2026%2F01%2F03%2F220307\" title=\"Rails\u306eActiveRecord\u3067scope\u3092\u4f7f\u3046 \u203b \u5f15\u6570\u3042\u308a/\u306a\u3057\u30d1\u30bf\u30fc\u30f3 - delhi09\u306e\u52c9\u5f37\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Rails\u306eActiveRecord\u3067scope\u3092\u4f7f\u3046 \u203b \u5f15\u6570\u3042\u308a/\u306a\u3057\u30d1\u30bf\u30fc\u30f3","version":"1.0","height":"190","categories":["Rails"],"provider_name":"Hatena Blog","description":"Rails\u306eActiveRecord\u3067scope\u3092\u4f7f\u3046\u65b9\u6cd5\u3067\u3059\u3002 scope\u3068\u306f\u3088\u304f\u4f7f\u3046\u6761\u4ef6\u3092\u30e1\u30bd\u30c3\u30c9\u5316\u3067\u304d\u308bActiveRecord\u306e\u6a5f\u80fd\u3067\u3059\u3002 \u5f15\u6570\u306a\u3057\u306e\u30d1\u30bf\u30fc\u30f3 \u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u307e\u3059\u3002 class Restaurant < ApplicationRecord # \u7701\u7565 scope :south_india, -> { joins(:tags).where(tags: { name: \"\u5357\u30a4\u30f3\u30c9\" }) } end Restaurant\u30e2\u30c7\u30eb\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 app(dev):002> Restaurant.south_india.count Restaurant\u2026","image_url":null,"type":"rich","blog_title":"delhi09\u306e\u52c9\u5f37\u65e5\u8a18","author_name":"kamatimaru","width":"100%"}