Creating a New Resource

# Using the Generator CLI

Lucky comes with a lot of neat commands to make building your application a little easier. From your terminal, type lucky -h. Give it a moment to compile, then see a list of the commands you can use.

For our next section, we will be generating a new “resource”; the “Fortune”. In this context, a resource is a Model, Action, Page, Component, Query, and Operation. Lucky breaks a resource down in to smaller class components which we will discuss over the tutorial.

For more information on Lucky CLI commands, read the Built In Tasks guide.

# Planning the model

Before we generate the new resource, we should plan out what this model will need.

A User can write as many “fortunes” as they want, and each Fortune will belong to that user. The fortunes themselves will be a short bit of text. Pretty simple!

# Generating the model

Let’s run our generator CLI task. Enter this command in your terminal:

lucky gen.resource.browser Fortune text:String

The command breaks down like this:

• The lucky CLI command. All Lucky tasks are executed from this
• gen.resource.browser is the name of the command to run
• Fortune is the name of our model
• text:String is the name of the column and its type separated with a colon. You can add as many as you need here, just separate them by a space.

You can learn more about each CLI command by passing the -h or --help flag. (e.g. lucky gen.resource.browser -h)

Some shells may require the last portion to be wrapped in quotes. (i.e. "text:String")

# Running the Migration

Lucky generated a migration file for us located in db/migrations/20241221130147_create_fortunes.cr. This migration file will generate a SQL statement for us that will create our “fortunes” table and add the columns our table needs like text, as well as a few other columns Avram gives to us for free: id, created_at, and updated_at.

To execute this code, we will run the db.migrate CLI task. Enter lucky db.migrate:

lucky db.migrate

You should see a response that says “Migrated”.

For more information on migrations, read the Migrations guide.

# Your Turn

Now that we’ve updated our database, we can boot our app to test a few things.

Try this:

• Boot your application. (lucky dev)
• Sign in, then visit /fortunes in your browser.
• Add a few fortunes, then edit one, and delete one.
• Sign out of your account, then try to visit /fortunes. Notice how it asks you to sign in first?
• Sign up a new account.
• View the fortunes page, and notice you can edit the other users fortunes. Oops!
• Leave at least 1 fortune record.

We will fix the association issue in the next section.