Rails migration: primary key id with unsigned int(10)

rails change primary key
rails id bigint
rails id serial
rails migration foreign key
postgres change id to bigint
rails data types
rails add_column
rails foreign key

I want to define primary key id as below in my tables through rails migration

id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT

I am using mysql db.


If you prefer to avoid custom SQL in migrations this will work as well:

create_table(:user, id: false,  primary_key: :id) do |t|
  t.primary_key :id, :unsigned_integer, null: false, default: :null, auto_increment: true
  t.string :name
end

Unsigned integers for MySQL · Issue #574 · rails/rails · GitHub, I want to define primary key id as below in my tables through rails migration. id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT. I am using mysql db. Although the standard MySQL type for id columns is an unsigned int, Rails has no support for them and uses regular signed int(11) as the default for primary keys. In addition, most of my tables are less than 16 million rows (max rows for an unsigned mediumint) and so it saves space to use smaller sized numeric types such as smallint or mediumint to save space.


Just use #execute with the SQL you need inside your migration.

execute "ALTER TABLE things MODIFY id UNSIGNED(10) NOT NULL AUTO_INCREMENT"

Or if the column doesn't yet exist at all:

execute "ALTER TABLE things ADD COLUMN id UNSIGNED(10) NOT NULL AUTO_INCREMENT PRIMARY KEY"

That should work fine. I think in your migrations it's fine to drop down to pure SQL, and in many cases it's necessary.

Rails 5.1: Default Primary Keys, changes the primary key data type for the MySQL adapter to be "int(11) unsigned​"; changes the references (aka belongs_to) 'sexy' migration methods to generate unsigned foreign key fields by create_table(:categories_suppliers, :id => :​unsigned) do |t| . end Comment by Rob Anderton - 2008-09-30 10:12:27 UTC​. Contribute to rails/rails development by creating an account on GitHub. Currently schema dumper lost the unsigned option when primary key is defined as bigint with unsigned. This commit fixes the issue.


I worked out with this

create_table things, :id => false do |t|
  t.column :id, 'INT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)'
  t.string :name
  ...

OR

create_table things, :id => false do |t|
  t.column :id, ID_COLUMN
  t.string :name
  ...

where ID_COLUMN defined in some config/module and used in other migrations as well

Unsigned integers for MySQL patch - rubyonrails-core, Friends don't let friends use INT as a primary key. they managed to migrate to using 64-bit integers and bought themselves I submitted that patch last year: https://www.mccartie.com/2015/10/20/default-uuid's-in-rails.html change_column :users, :id, :bigint, unique: true, null: false, auto_increment: true. Rails 5.1 changed the default primary key type from integer to bigint/bigserial in: rails/rails#26266 With this change, they modified the default compatibility layer for versions less than 5.1 to default to integer if not provided. Since we want our default to be bigint/bigserial for those old migrations, we need to prepend our module on the migration class for old migrations.


Rails 5.2 does accept unsigned

t.integer     :amount,          null: false, unsigned: true

Rails Migration: Primärschlüssel-ID mit unsigned int (10), rob-twf (rob-twf) March 13, 2020, 10:55pm #1. Hi all, changes the primary key data type for the MySQL adapter to be "int(11) unsigned". * changes the references/belongs_to 'sexy' migration methods to bigint (which needs 8 bytes of storage) or in an unsigned integer t.change :id, :integer, :unsigned => true end. 3. When the SQL is generated, the attempt is to make a hats.member_id which is created as a bigint(20) be a foreign key referencing members.id which is a lowly int(11) having been created from an old migration (before the version tagging began and when 4-byte primary keys were good enough).


[PDF] [Oracle] $ rails db:migrate, ich gearbeitet mit diesem create_table things, :id => false do |t| t.column :id, 'INT UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)' t.string :name  Foreign keys with migrations: don’t forget UNSIGNED October 21, 2015 While working on migration files in Laravel, it’s relatively easy to forget one small detail which will restrict you from creating foreign keys .


Unsigned integers for MySQL on Rails, Running rails migration to create database tables for two models based on migration files. Page 10 `id` is the default name of the primary key. Friends don't let friends use INT as a primary key. — Schneems (@schneems) May 13, 2016 Summary Per a conversation with @sgrif: changes default primary keys from Integer to BIGINT for both Postgresql and MySQL. Leaves behavior alone for SQLite since this database does not provide support for BIGINT primary keys.


TIL: Changing id column type to bigint : rails, And then I'm reminded that, lovely though Rails migrations are, there are 'int(11​) UNSIGNED DEFAULT NULL auto_increment PRIMARY KEY' end Base.​get_primary_key(table_name)) unless options[:id] == false yield  Rails is all about Convention over Configuration, this includes the DB primary key, which is always set to be id column. What if you want to use different column as your primary key? Read on and I’ll show you how. NOTE: This article is written for Rails 4.1.1 /w Postgres. Usecase