uuid and rails.rb

# create a migration to enable uuid# This will generate a new migration file with 
# timestamp_enable_uuid_extension.rbrails g migration EnableUuidExtension# In migration file add following line to enable pgcryptoclass EnableUuidExtension < ActiveRecord::Migration[6.0]
  def change
    enable_extension 'pgcrypto'
  end
end 


# Create migration for tasks tablerails g migration CreateTasksclass CreateTasks < ActiveRecord::Migration[6.0]
  def change
    create_table :tasks, id: :uuid do |t|
      t.string :title
      t.datetime :due
      t.string :status
    end
  end
end# Here we can see id: :uuid which is essential part to convert uuid as a primary key.



# Verify the uuid
# Open consolerails c# Create a new task in console. Make sure task.rb is present in
# modelTask.create!(title: 'Implement UUID', due: (DateTime.now + 2.hours), status: 'new')#<Task id: "36b4177e-2a82-4ff3-84b6-d6bb33d4103e", title: "Implement UUID", due: '2019-01-01T07:05:30', status: new>