2 replies

Use default value when decoding fails

Let's say we have a struct with field that accepts multiple literals. I want to decode it in a way, that if the decoding of the field fails, the

unknown

unknown

is set as a value.

I was used to doing it in a zod like this:

const zodObject = z.object({
  someLiterals: z.enum(['valueA', 'valueB', 'unknown']).catch('unknown'),
  // ... imagine there are more fields here
})

const schemaObject = Schema.Struct({
  someLiterals: Schema.Literal('valueA', 'valueB', 'unknown'), // How to catch errors, if there is an unknown value?
  // ...imagine there are more fields here
})

const zodObject = z.object({
  someLiterals: z.enum(['valueA', 'valueB', 'unknown']).catch('unknown'),
  // ... imagine there are more fields here
})

const schemaObject = Schema.Struct({
  someLiterals: Schema.Literal('valueA', 'valueB', 'unknown'), // How to catch errors, if there is an unknown value?
  // ...imagine there are more fields here
})

So object like this

{someLiterals: 'valueC'}

{someLiterals: 'valueC'}

gets encoded into

{someLiterals: 'unknown'}

{someLiterals: 'unknown'}

.

Is it possible to do with some transformer in schema?

Effect Community•2y ago•

2 replies

David Novák

Use default value when decoding fails

Let's say we have a struct with field that accepts multiple literals. I want to decode it in a way, that if the decoding of the field fails, the

unknown

unknown

is set as a value.

I was used to doing it in a zod like this:

const zodObject = z.object({
  someLiterals: z.enum(['valueA', 'valueB', 'unknown']).catch('unknown'),
  // ... imagine there are more fields here
})

const schemaObject = Schema.Struct({
  someLiterals: Schema.Literal('valueA', 'valueB', 'unknown'), // How to catch errors, if there is an unknown value?
  // ...imagine there are more fields here
})

const zodObject = z.object({
  someLiterals: z.enum(['valueA', 'valueB', 'unknown']).catch('unknown'),
  // ... imagine there are more fields here
})

const schemaObject = Schema.Struct({
  someLiterals: Schema.Literal('valueA', 'valueB', 'unknown'), // How to catch errors, if there is an unknown value?
  // ...imagine there are more fields here
})

So object like this

{someLiterals: 'valueC'}

{someLiterals: 'valueC'}

gets encoded into

{someLiterals: 'unknown'}

{someLiterals: 'unknown'}

.

Is it possible to do with some transformer in schema?

Use default value when decoding fails

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