Add Get The Column Names For A Model as a Rails til

README.md

@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_824 TILs and counting..._
+_825 TILs and counting..._
 
 ---
 
@@ -499,6 +499,7 @@ _824 TILs and counting..._
 - [Disambiguate Where In A Joined Relation](rails/disambiguate-where-in-a-joined-relation.md)
 - [Ensure Migrations Use The Latest Schema](rails/ensure-migrations-use-the-latest-schema.md)
 - [Generating And Executing SQL](rails/generating-and-executing-sql.md)
+- [Get The Column Names For A Model](rails/get-the-column-names-for-a-model.md)
 - [Hash Slicing](rails/hash-slicing.md)
 - [Ignore Poltergeist JavaScript Errors](rails/ignore-poltergeist-javascript-errors.md)
 - [List The Enqueued Jobs](rails/list-the-enqueued-jobs.md)

rails/get-the-column-names-for-a-model.md

@@ -0,0 +1,16 @@
+# Get The Column Names For A Model
+
+An `ActiveRecord` model is backed by a table in your application's database. We
+can get the column names for a backing table with `ActiveRecord`s help using
+the `.column_names` method.
+
+```ruby
+> Book.column_names
+=> ["id", "title", "publication_year", "created_at", "updated_at", "author_id", "genre"]
+```
+
+Any `ActiveRecord` model will have access to this class method.
+
+See [the
+docs](https://devdocs.io/rails~5.2/activerecord/modelschema/classmethods#method-i-column_names)
+for more details.