user=User.last Product.find(user) find会把user的id的值进行查询。 find没有查询到结果,会抛出一个ActiveRecord::RecordNotFound异常。 find_by 需要传递一个hash作为参数。像Product.find_by(id:3),查询语句是Product Load (0.1ms) SELECT "products".* FROM "products" WHERE "products"."id" = ? LIMIT...
/^find_(all_by|by)_([_a-zA-Z]\w*)$/.match("find_by_a_and_b_and_c").captures.last # =>"a_and_b_and_c" 这样,第一行代码所匹配的方法名具体为find_by(或all_by)_aaaBBB形式 而extract_attribute_names_from_match允许我们匹配形式为find_by(或all_by)_aaaBBB_and_cccDDD_and_eeeFFF...
/^find_(all_by|by)_([_a-zA-Z]\w*)$/.match("find_by_a_and_b_and_c").captures.last # => "a_and_b_and_c" 这样,第一行代码所匹配的方法名具体为find_by(或all_by)_aaaBBB形式 而extract_attribute_names_from_match允许我们匹配形式为find_by(或all_by)_aaaBBB_and_cccDDD_and_eeeF...
帮助Rails find_by查询 技术标签: SQL. 红宝石例如,如果@news_wriiters是一系列记录。然后,我想使用@news_witers找到由@news_writers中包含的所有新闻编写器编写的所有新闻项目。 所以我想要这样的东西(但这是语法不正确): @news = News.find_all_by_role_id(@news_writers.id) 注意 class Role < ...
Model.find_by_id(primary_key) 如果没有找到对应记录,返回 nil Model.find(primary_key [array_of_primary_key]) 如果没有找到对应记录,则会报错:ActiveRecord::RecordNotFound
问带有参数的Rails find_by_sql，如%.%EN在Rails中，我有一个查询，让我们假设如下：每天不是在写 ...
问Rails: Model.find()或Model.find_by_id()以避免RecordNotFoundEN一年前，我合并了三个网站，导致...
find_by(keycloak_id: keycloak_id) end end Or if using opt-in mode, the controller can request validation conditionally: class MostlyAuthenticatedController < ApplicationController include Keycloak::Authentication before_action :keycloak_authenticate, only: show def show keycloak_id = Keycloak::Helper....
Record.find_by(color: 'blue')GET https://service.example.com/records?color=blue firstfirst is an alias for finding the first record without parameters. If no record is found, nil is returned.first! raises DHC::NotFound if nothing was found.Record.firstGET https://service.example.com/...
by Noel Rappin Improve the user experience for your Rails app with rich, engaging client-side interactions. Learn to use the Rails 7 tools and simplify the complex JavaScript ecosystem. It’s easier than ever to build user interactions with Hotwire, Turbo, and Stimulus. You can add great fron...