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Troubleshooting

Error when validating default values

If you have a field in your schema with a :default value, and are running Ecto 3.6 or later, you may encounter an error like this:

** (ArgumentError) errors were found at the given arguments:

  * 1st argument: the table identifier does not refer to an existing ETS table

    (stdlib 4.0) :ets.lookup(MyApp.Vault.Config, :config)
    (cloak 1.1.2) lib/cloak/vault.ex:285: Cloak.Vault.read_config/1
    lib/cloak/vault.ex:224: MyApp.Vault.encrypt/1
    lib/cloak_ecto/type.ex:37: Cloak.Ecto.Encrypted.Binary.dump/1
    (ecto 3.8.4) lib/ecto/schema.ex:2198: Ecto.Schema.validate_default!/3
    (ecto 3.8.4) lib/ecto/schema.ex:1919: Ecto.Schema.__field__/4
    lib/my_app/post.ex:9: (module)

This error happens because cloak relies on an ETS table which is only available at runtime, and Ecto 3.6+ tries to validate default values at compile time.

To fix it, add the :skip_default_validation option:

field :name, MyApp.Encrypted.Binary, default: "foo", skip_default_validation: true