Merge 295fe153ad into fc93ecfed4

Hello, I've added a small blockquote below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.

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).
 
-_1447 TILs and counting..._
+_1448 TILs and counting..._
 
 ---
 
@@ -986,6 +986,7 @@ _1447 TILs and counting..._
 - [Update Column Versus Update Attribute](rails/update-column-versus-update-attribute.md)
 - [Upgrading Your Manifest For Sprocket's 4](rails/upgrading-your-manifest-for-sprockets-4.md)
 - [Use IRB And Ruby Flags With Rails Console](rails/use-irb-and-ruby-flags-with-rails-console.md)
+- [Validate Column Data With Check Constraints](rails/validate-column-data-with-check-constraints.md)
 - [Verify And Read A Signed Cookie Value](rails/verify-and-read-a-signed-cookie-value.md)
 - [Where Am I In The Partial Iteration?](rails/where-am-i-in-the-partial-iteration.md)
 - [Why Redirect And Return In Controllers](rails/why-redirect-and-return-in-controllers.md)

javascript/accessing-arguments-to-a-function.md

@@ -5,6 +5,8 @@ an array-like object with all of the arguments to the function. Even if not
 all of the arguments are referenced in the function signature, they can
 still be accessed via the `arguments` object.
 
+> For ES6+ compatibility, the `spread` operator used via [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) is preferred over the `arugments` object when accessing an abritrary number of function arguments.
+
 ```javascript
 function argTest(one) {
   console.log(one);

rails/validate-column-data-with-check-constraints.md

@@ -0,0 +1,32 @@
+# Validate Column Data With Check Constraints
+
+A check constraint is a feature of database systems like PostgreSQL that allows
+you to enforce rules about the data that goes in a table's column. As of Rails
+6.1, ActiveRecord provides a way to add a check constraint via the DSL.
+
+In this example, we want to ensure that the value going into the
+reading_statuses.status column is one of four values. Nothing else besides
+these four values should be allowed.
+
+```ruby
+class AddReadingStatusTable < ActiveRecord::Migration[7.2]
+  def change
+    create_table :reading_statuses do |t|
+      t.references :user, null: false, foreign_key: true
+      t.references :book, null: false, foreign_key: true
+      t.string :status, null: false
+      t.timestamps
+    end
+
+    add_check_constraint
+      :reading_statuses,
+      "status in ('started', 'completed', 'abandoned', 'already_read')",
+      name: "reading_statuses_valid_status_check"
+  end
+end
+```
+
+The `#add_check_constraint` method takes the name of the table and a SQL clause
+that can evaluate to true or false for a given row. We can optionally include
+the name of the check constraint (e.g. {table_name}_{column_name}_check) like
+we've done above.