Migration Example in Rails

20180928035240_create_games.rb

class CreateGames < ActiveRecord::Migration[5.2]
  def change
    create_table :games do |t|
      t.integer :player_count
      t.integer :board_count
      t.string :rotation
      t.datetime :starts_at
      t.string :commongame_reference

      t.timestamps
    end
  end
end

postgres explanation of table

        Column        |            Type             | Collation | Nullable |              Default              
----------------------+-----------------------------+-----------+----------+-----------------------------------
 id                   | bigint                      |           | not null | nextval('games_id_seq'::regclass)
 board_count          | integer                     |           |          | 
 rotation             | character varying           |           |          | 
 starts_at            | timestamp without time zone |           |          | 
 commongame_reference | character varying           |           |          | 
 created_at           | timestamp without time zone |           | not null | 
 updated_at           | timestamp without time zone |           | not null | 
Indexes:
    "games_pkey" PRIMARY KEY, btree (id)