Add Create Table With bigint Id As Primary Key as a Rails TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1501 TILs and counting..._
+_1502 TILs and counting..._
 
 ---
 
@@ -929,6 +929,7 @@ _1501 TILs and counting..._
 - [Count The Number Of Records By Attribute](rails/count-the-number-of-records-by-attribute.md)
 - [Create A Custom Named References Column](rails/create-a-custom-named-references-column.md)
 - [Create A Join Table With The Migration DSL](rails/create-a-join-table-with-the-migration-dsl.md)
+- [Create Table With bigint Id As Primary Key](rails/create-table-with-bigint-id-as-primary-key.md)
 - [Creating Records of Has_One Associations](rails/creating-records-of-has-one-associations.md)
 - [Custom Validation Message](rails/custom-validation-message.md)
 - [Customize Paths And Helpers For Devise Routes](rails/customize-paths-and-helpers-for-devise-routes.md)

rails/create-table-with-bigint-id-as-primary-key.md

@@ -0,0 +1,30 @@
+# Create Table With bigint ID As Primary Key
+
+When creating a new table with an ActiveRecord migration, we specify all the
+fields _except_ the `id`. The `id`, which is the primary key, is implicit. We
+get it by default.
+
+The type of that `id` defaults to `int` which is a 32-bit signed integer.
+
+We can override the type of `id` in a variety of ways. The one I prefer in most
+cases is to make the `id` of type `bigint`. This is a 64-bit signed integer. It
+offers quite a bit more headroom for the number of unique identifies in our
+table.
+
+This can be specified by including `id: :bigint` as an option to the
+`create_table` method.
+
+```rails
+class CreatePosts < ActiveRecord::Migration[8.0]
+  def change
+    create_table :posts, id: :bigint do |t|
+      t.string :title, null: false
+      t.string :body, null: false
+
+      t.timestamps
+    end
+  end
+end
+```
+
+[source](https://api.rubyonrails.org/v7.1/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-create_table)