poipoi

poipoi

Ecto changeset generated with phx.gen.context does not require id for update

Hi everyone,
When you generate a context with phx.gen.context, the generator creates a changeset function in the schema file that casts certain attributes and marks others as required. However, the id is neither cast nor required.

This changeset is then utilized in nearly all the generated functions within the context.
This works fine for most of the functions, but shouldn’t the changeset used in the update and delete functions of the context require the presence of the id in the struct?
I know that the code can be modified to do this, I thought that the generator should handle it. (if it’s good to do so)

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thomas.fortes

thomas.fortes

This will fail because Repo.get/3 returns nil when there’s no result and you can’t Map.put/3 on nil

This is called an “upsert” and ecto has support for it as described here.

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