That's it, now you're all setup to use UUID as the primary key in all your models. For these type of migrations, need to specify type: :uuid: class AddTenantRefToPlan < ActiveRecord::Migration def change add_reference :plans, :tenant, null: false, foreign_key: true, index: true, type: :uuid end end However, running this won't work because it will try to create an integer type column tenant_id on the Plans referencing the id column on Tenants table which is of type uuid which doesn't match. Which would generate: class AddTenantRefToPlan < ActiveRecord::Migration def change add_reference :plans, :tenant, null: false, foreign_key: true, index: true end end The migration for this is: bundle exec rails generate migration AddTenantRefToPlan tenant:references Postgres natively supports UUID as a data type, even capable of being indexed and used as primary key. For example, suppose there is a Plan table and you want to add a reference to the Tenants table. One last thing to watch out for is adding a foreign key reference to a table. How does SQL Formatting work SQL Code Formatter uses server side logic to beautify SQL statements and SQL queries. This should be the first migration to enable it: class EnableUuid Tenant.create(name: 'Acme') => # Step 4: Foreign Key Reference The pgcrypto module provides cryptographic functions for Postgres, however, it's not enabled by default. Trying to convert an existing system could be risky because every single record in every table would have to get migrated and foreign key constraints temporarily dropped during migration. This works best on a brand new application with no production data yet. This post shows the steps needed to configure Rails to use UUID for primary key with Postgres. So if this was a subscription id, the url would be /subscription/123e4567-e89b-12d3-a456-426614174000 which reveals absolutely nothing about how many subscriptions have been created or what the next subscription id would be. The idea is that it's practically universally unique, and they are not sequential. Depending on the system, this can be an issue if these values get exposed in urls, for example /subscription/265 would reveal that 265 subscriptions have been generated, and that the next one will be id 266.Ī less revealing option can be to use UUIDs (universally unique identifier) as a primary key. So the first record inserted would get a primary key of 1, next one 2 and so on. PostgreSQL UUID data type used to generate a sequential number. When working with Rails and a relational database such as Postgres, the default option for primary key is an auto-incrementing sequence. Why doesnt Postgres generate UUIDs itself PostgreSQL allows you to store and compare UUID values, but it doesnt have any built-in methods for creating them. Postgres id vs uuid UUID (Universally Unique Identifier), also known as GUID (Globally.
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