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Today I Learned

How to use factories to create relationships which follow a sequence

Factories an extremely useful tool for testing. The more complex the use case, the more awesome you find out Laravel factories are.

For instance, we might need to create a few items, each one with a different measurement of its own:

 Item::factory()
    //...
    ->has(Measurement::factory()->state(new Sequence(
        ['length' => 50, "width" => 110],
        ['length' => 65, "width" => 200],
        ['length' => 190, "width" => 295],
    )))
  ->count(3)
  ->create()

This will result in 3 items, each item having one unique measurement assigned. The first item will have a measurement with values corresponding to the first array in the sequence and so on.