Add model and table

app/models/hello.rb

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+class Hello < ApplicationRecord
+end

db/migrate/20230506124139_create_hellos.rb

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+class CreateHellos < ActiveRecord::Migration[7.0]
+  def change
+    create_table :hellos do |t|
+
+      t.timestamps
+    end
+  end
+end

test/fixtures/hellos.yml

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+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+# This model initially had no columns defined. If you add columns to the
+# model remove the "{}" from the fixture names and add the columns immediately
+# below each fixture, per the syntax in the comments below
+#
+one: {}
+# column: value
+#
+two: {}
+# column: value

test/models/hello_test.rb

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+require "test_helper"
+
+class HelloTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end