使用add_foreign_key进行Rails迁移时,"外键约束中引用的列"user_id"不存在"是一个常见的错误。这个错误通常发生在尝试在数据库表之间创建外键关系时。 在Rails中,add_foreign_key方法用于在迁移文件中添加外键约束。它的语法如下: add_foreign_key :table_name, :target_table...
最简单的app也需要一些UI(就是用户所看到好）和与服务端的接口交互，用来获取有意义的信息。
Motivation / Background Add respond_to_missing? implementation to complement existing method_missing. Detail Assume that there is a migration file like that: class AddUserIdToLists < ActiveRecord:...
DELETE /admin/articles/:id(.:format) admin/articles#destroy admin_users GET /admin/users(.:format) admin/users#index POST /admin/users(.:format) admin/users#create new_admin_user GET /admin/users/new(.:format) admin/users#new edit_admin_user GET /admin/users/:id/edit(.:format) admin/...
Defaults to true. Create a user_id bigint column without an index add_reference(:products, :user, index: false) Create a user_id string column add_reference(:products, :user, type: :string) Create supplier_id, supplier_type columns add_reference(:products, :supplier, polymorphic: true) ...
Customize to suit you. Install TinyMCE by adding just a few lines of code. Used by 1.5M+ devs, with full control of the UI, configuration and integrations.Developer benefits → INCREASE SPEED-TO-MARKET Trusted component. Feature loaded. Flexible. TinyMCE gives you familiar, user-friendly ...
add_foreign_key :orders, :carts, primary_key: [:shop_id, :user_id] generates: ALTER TABLE "orders" ADD CONSTRAINT fk_rails_6f5e4cb3a4 FOREIGN KEY ("cart_shop_id", "cart_user_id") REFERENCES "carts" ("shop_id", "user_id") Creating a cascading foreign key add_foreign_key :...
This plugin provides a flexible way to add authorization to Rails.The authorization process decides whether a user is allowed access to some feature. It is distinct from the authentication process, which tries to confirm a user is authentic, not an imposter. There are many authentication systems ...
el_to_remove.fadeOut(1000) addresses.on 'cocoon:after-remove', (e, removed_el) -> recount() 地址 classAddress< ActiveRecord::Base belongs_to:essential end assesss.rb. classAddress< ActiveRecord::Base belongs_to:user has_many:addresses ...
an HTML, CSS, and JavaScript framework designed to simplify the process of making web projects responsive and mobile ready. By implementing Bootstrap in a Rails project, you can integrate its layout conventions and components into your application to make user interactions with your site more engagi...