Add Generate A Model as a Rails TIL

rails/generate-a-model.md

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+# Generate A Model
+
+The `rails` CLI comes with a variety of generators. Perhaps the mostly common
+one to use is the _model_ generator.
+
+The model generator will create a migration and a model file for the entity
+that you name. In the following example `Book` will result in a
+`app/models/book.rb` file as well as a migration file for a `books` table.
+These generators know the singular and plural conventions.
+
+At the end of the command is a series of field definitions containing the field
+_name_ and field _type_. These are used in the migration file for defining
+columns on the new table.
+
+```bash
+❯ bin/rails generate model Book title:string publication_date:date author:string
+      invoke  active_record
+      create    db/migrate/20240920223447_create_books.rb
+      create    app/models/book.rb
+      invoke    rspec
+      create      spec/models/book_spec.rb
+```
+
+You may also notice that an `rspec` action was invoked as part of this
+generator. That is because I have the `rspec-rails` gem in my project. That gem
+hooks into the model generator so that a model spec also gets generated. Handy!