schema2type

Using schema2type, you can generate TypeScript type definitions from Rails'schema.rb automatically.

Start with a schema.rb:

ActiveRecord::Schema.define(version: xxxx) do
  create_table "Users", force: :cascade, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8" do |t|
    t.string "name"
    t.integer "age"
    t.bigint "sales"
    t.boolean "paid", null: false
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["patient_id"], name: "index_histories_on_patient_id"
  end
end

Automatically have the following TypesScript type generated.

declare namespace schema {
  type User = {
    id: number;
    name: string | null;
    age: number | null;
    sales: number | null;
    paid: boolean;
    createdAt: string;
    updatedAt: string;
  }
}

Installation

Add this line to your application's Gemfile:

gem 'schema2type'

And then execute:

$ bundle

Or install it yourself as:

$ gem install schema2type

Usage

bundle exec schema2type -o schema.d.ts

options

command	require	default	detail
-o	true	-	Output file name of TypeScript
-s	false	"./db/schema.rb"	Path of your schema.rb
-n	false	"schema"	Name of declare namespace
--snake	false	false	Convert property name to snake_case

conversion table

the schema2type convert as per this conversion table.

create_table block method	converted Type
string	string
text	string
json	Record<string, any>
jsonb	Record<string, any>
binary	string
inet	string
integer	number
bigint	number
float	number
decimal	number
boolean	boolean
date	string
datetime	string
timestamp	string
datetime_with_timezone	string

License

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