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Add Generate A Model as a Rails TIL

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2024-09-20 20:54:52 -05:00
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README.md
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For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186). For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1441 TILs and counting..._ _1442 TILs and counting..._
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- [Find Or Create A Record With FactoryBot](rails/find-or-create-a-record-with-factory-bot.md) - [Find Or Create A Record With FactoryBot](rails/find-or-create-a-record-with-factory-bot.md)
- [Find Records With Multiple Associated Records](rails/find-records-with-multiple-associated-records.md) - [Find Records With Multiple Associated Records](rails/find-records-with-multiple-associated-records.md)
- [Force All Users To Sign Out](rails/force-all-users-to-sign-out.md) - [Force All Users To Sign Out](rails/force-all-users-to-sign-out.md)
- [Generate A Model](rails/generate-a-model.md)
- [Generate A Rails App From The Main Branch](rails/generate-a-rails-app-from-the-main-branch.md) - [Generate A Rails App From The Main Branch](rails/generate-a-rails-app-from-the-main-branch.md)
- [Generating And Executing SQL](rails/generating-and-executing-sql.md) - [Generating And Executing SQL](rails/generating-and-executing-sql.md)
- [Get A Quick Approximate Count Of A Large Table](rails/get-a-quick-approximate-count-of-a-large-table.md) - [Get A Quick Approximate Count Of A Large Table](rails/get-a-quick-approximate-count-of-a-large-table.md)

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rails/generate-a-model.md Normal file
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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!