This gem makes it possible to use ULID for DB primary keys in a Ruby on Rails app.

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• Rails G Model Foreign Key
• Ruby On Rails Generate Model With Foreign Key Code
• Ruby On Rails Generate Model With Foreign Keys
• Ruby On Rails Generate Model With Foreign Key Examples

Railsマイグレーションのindex、foreignkeyの設定 Railsで外部キー制約のついたカラムを作る時のmigrationの書き方 Rails4 外部キーをテーブルに設定するための、3通りのマイグレーションの書き方。 Railsマイグレーションの外部キー制約を表現するreferencesについて. Aug 04, 2016  Ruby On Rails - Has And Belongs To Many Associations Apple Juice Teaching. Primary & Foreign Keys. Understanding Model in Ruby on Rails. Creating simple model.

Installation

And then execute:

Or install it yourself as:

Usage

Migrations

Specify id: false to create_table and add id column as 16-byte binary type.

Model Changes

Just add the below lines to your models.

Extract timestamp

Since ULID includes milli seconds precision timestamp, you don't need to store created_at.ulid-rails provides a helper method that defines timestamp method which extract timestamp from ULID column.

created_at virtual column

MySQL 5.7 and higher Only (for now)

You can define a 'virtual column' in MySQL DB that acts same as a physical column.Defining the virtual created_at is kind of comlicated so this gem provides a helper method for it.

Rails G Model Foreign Key

A virtual column is useful if you want to add index on the timestamp column or want to execute raw SQL with created_at.

virtual_ulid_timestamp takes two arguments, the first one is the name of the column name (typically, created_at) and the second one is the ULID column that creation timestamp is extracted from.

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Auto-generate ULID

If primary_key is true, ULID is auto-generated before create by default.You can enable or disable auto-generation with auto_generate option.

Foreign Keys

You need to specicfy type option

Development

Run tests

Just run the below command to test with all supported DB engines.

License

The gem is available as open source under the terms of the MIT License.

Ruby on Rails is an open source framework you can use to build Web sites and Web-based databases. Of course, as with any programming language, you need to know Ruby’s keywords and Rail’s naming conventions. Making sure that your data meets validation standards is key, and the proper iterators make traveling amongst your data a breeze.

Ruby on Rails Keywords

If you’re using Ruby on Rails to create your Web site or database, you need to know the keywords Ruby uses. Fortunately, you have access to the following table, which lists Ruby’s keywords:

Naming Conventions for Ruby on Rails

You’re using Ruby on Rails to create a Web application or Web database app, which is very smart of you. Depending on what you’re working with — an application, a one-to-many relationship, or a many-to-many relationship — you use different variations on Rails naming protocols, which are explained in the following sections.

Ruby naming for new apps

Ruby On Rails Generate Model With Foreign Key Code

When you create a new application — for example, an album project with a photos database table — use the following steps:

1. Create a Rails project named album.

2. Create databases named album_development, album_test, album_production.

3. Generate a Photo model. (In the RadRails Generators view, select model in the drop-down list, and type Photo in the text field to the right of the drop-down list.)

   • Rails creates a class named Photo in a file named photo.rb.

   • Rails creates a migration file named 001_create_photos.rb.

4. Create a database table named photos.

5. Generate a Photo scaffold. (In the RadRails Generators view, select scaffold in the drop-down list and type Photo in the text field to the right of the drop-down list.)

   • Rails creates a class named PhotosController in a file named photos_controller.rb.

6. Visit http://localhost:300x/photos/.

Ruby naming in a one-to-many relationship

When you work with a foreign key in a one-to-many relationship (for example, one photo with many comments), follow these tips:

Ruby On Rails Generate Model With Foreign Keys

• The comments table has a photo_id column.

• The Comment model contains the statement belongs_to :photo.

• The Photo model contains the statement has_many :comments.

Ruby naming in a many-to-many relationship

When you work with a many-to-many relationship (for example, photos and tags), keep these protocols in mind:

• The Photo model contains the statement has_and_belongs_to_many :tags.

• The Tag model contains the statement has_and_belongs_to_many :photos.

• The photos_tags table (so named because photos comes before tags alphabetically) has no id column.

Ruby on Rails Validation Helpers

When you create a Web site or Web application with Ruby on Rails, you need to make sure that you input data in a form that Rails recognizes and can use. The following table contains Rails validation helpers:

Useful Iterators and Methods for Ruby on Rails

Ruby On Rails Generate Model With Foreign Key Examples

When you want to travel through the items in a database you created with Ruby on Rails, knowing the iterators to use is key. The following table shows helpful iterators and methods: