Add Test Out URL And Path Helpers In The Console as a Rails til

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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 - [Temporarily Disable strong_params](rails/temporarily-disable-strong-params.md)
 - [Test If An Instance Variable Was Assigned](rails/test-if-an-instance-variable-was-assigned.md)
 - [Test If deliver_later Is Called For A Mailer](rails/test-if-deliver-later-is-called-for-a-mailer.md)
+- [Test Out URL And Path Helpers In The Console](rails/test-out-url-and-path-helpers-in-the-console.md)
 - [Truncate Almost All Tables](rails/truncate-almost-all-tables.md)
 - [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)

rails/test-out-url-and-path-helpers-in-the-console.md

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+# Test Out URL And Path Helpers In The Console
+
+Rails has fancy metaprogrammed URL and path helpers generated from the
+`config/routes.rb` file. There is a ton of configurability to these routes. It
+can sometimes be hard to know exactly how they'll behave or what the generated
+route helper will look like. In those cases, we may want to test them out in
+the console.
+
+The Rails console doesn't have the same things autoloaded as mailers and views
+where we tend use these route helpers. So, we can reference them through
+`Rails.application.routes.url_helpers`.
+
+From there we can run both `*_path` route helpers.
+
+```ruby
+> Rails.application.routes.url_helpers
+    .api_v1_post_with_slugged_title_path(
+      slug: 123,
+      slugged_title: 'a-recent-path'
+    )
+
+=> "/api/v1/posts/123/a-recent-path"
+```
+
+and `*_url` path helpers.
+
+```ruby
+> Rails.application.routes.url_helpers
+    .api_v1_post_with_slugged_title_url(
+      slug: 123,
+      slugged_title: 'a-recent-path'
+    )
+
+=> "http://localhost:3000/api/v1/posts/123/a-recent-path"
+```
+
+For the `*_url` path helpers, make sure you have [`default_url_options`
+set](set-default-url-options-for-entire-application.md).