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Gist 58556979e4df23eb7277

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Aallyraza
Last edited Oct 18, 2015
Created on Oct 18, 2015

The example shows an Ecto schema relationship between a T-shirt store’s `Product` and `Category` modules, where each product belongs to a category and each category has many products. It demonstrates a common data-fetching pattern using `Product |> Repo.get!(id) |> Repo.preload(:category)` to load a product with its associated category. However, the code fails at runtime because the `Ecto.Queryable` protocol is not implemented for the `TShirtStore.Category` struct, revealing a mismatch between the expected queryable behavior and the actual category module definition. The visualization highlights the error that occurs when preloading a belongs-to association.

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