Add Build A Hash Of Model Attributes as a rails til

rails/build-a-hash-of-model-attributes.md

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+# Build A Hash Of Model Attributes
+
+Have you ever found yourself creating an `ActiveRecord` object with
+[FactoryBot](https://github.com/thoughtbot/factory_bot) with the sole purpose
+of turning it into a hash of attributes?
+
+```ruby
+> FactoryBot.build(:book).attributes
+{ "id"=>nil, "title"=>"Fledgling", "genre"=>"fiction" }
+```
+
+FactoryBot has a built-in method for doing this:
+
+```ruby
+> FactoryBot.attributes_for(:book)
+{ title: "Fledgling", genre: "fiction" }
+```
+
+It also accepts any traits for that factory:
+
+```ruby
+> FactoryBot.attributes_for(:book, :published)
+{
+  title: "Fledgling",
+  genre: "fiction",
+  publication_year: 2005,
+  page_count: 362
+}
+```
+
+This is a handy way of build a base set of attributes when testing an API
+endpoint.
+
+[source](https://devhints.io/factory_bot)