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Showing content from https://www.mongodb.com/docs/realm-sdks/swift/latest/Protocols/FailableCustomPersistable.html below:

FailableCustomPersistable Protocol Reference

public protocol FailableCustomPersistable : _CustomPersistable

A type which can be mapped to and from a type which Realm supports.

This protocol is identical to CustomPersistable, except with init?(persistedValue:) instead of init(persistedValue:).

FailableCustomPersistable types are force-unwrapped in non-Optional contexts, and collapsed to nil in Optional contexts. That is, if you have a value that can’t be converted to a URL, reading a @Persisted var url: URL property will throw an unwrapped failed exception, and reading from Persisted var url: URL? will return nil.

• Construct an instance of the this type from the persisted type, returning nil if the conversion is not possible.

  This function must not return nil when given a default-initalized PersistedType().

  Declaration

  Swift

  init?(persistedValue: PersistedType)

• Construct an instance of the persisted type from this type.

  Declaration

  Swift

  var persistableValue: PersistedType { get }

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