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

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.