class DebugController < ActionController::Base def render_foo(argv = nil) @foo = 'Foo' render_to_string template: 'foos/show' end end DebugController.new.render_foo => "<!DOCTYPE html>\n<html lang='ja'>\n<head>\n<meta charset='UTF-8'>\n<title>Foo</title>\n</meta>\n</head>\n<body>\n<h1>Foo</h1>\n</body>\n</html>\n" ac = ApplicationController.new ac.instance_variable_set(:@foo, 'Foo') # インスタンス変数をインジ
![Rails Consoleなど任意の場所で任意のViewを任意条件でRenderする - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/4f32e57b04d235730ddbf65c5b32cca26d1308de/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Fadvent-calendar-ogp-background-7940cd1c8db80a7ec40711d90f43539e.jpg%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9UmFpbHMlMjBDb25zb2xlJUUzJTgxJUFBJUUzJTgxJUE5JUU0JUJCJUJCJUU2JTg0JThGJUUzJTgxJUFFJUU1JUEwJUI0JUU2JTg5JTgwJUUzJTgxJUE3JUU0JUJCJUJCJUU2JTg0JThGJUUzJTgxJUFFVmlldyVFMyU4MiU5MiVFNCVCQiVCQiVFNiU4NCU4RiVFNiU5RCVBMSVFNCVCQiVCNiVFMyU4MSVBN1JlbmRlciVFMyU4MSU5OSVFMyU4MiU4QiZ0eHQtY29sb3I9JTIzM0EzQzNDJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9MDZkYWNlZDRmNmE3NTA2YmU3ODI3OTc1NDMyOTJmOGU%26mark-x%3D142%26mark-y%3D100%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9OTcyJnR4dD0lNDBqZXJyeXdkbGVlJnR4dC1jb2xvcj0lMjMzQTNDM0MmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0xODVlMDY3YjdlNmFkZWNmNjRkMzEyNmQzNmQzOGFkZQ%26blend-x%3D142%26blend-y%3D504%26blend-mode%3Dnormal%26s%3Db97125df4ee172fa30f0a170b3976144)