rails new

db/seeds.rb

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+# This file should contain all the record creation needed to seed the database with its default values.
+# The data can then be loaded with the bin/rails db:seed command (or created alongside the database with db:setup).
+#
+# Examples:
+#
+#   movies = Movie.create([{ name: "Star Wars" }, { name: "Lord of the Rings" }])
+#   Character.create(name: "Luke", movie: movies.first)