Validation error prevents publishing when both internal and external link fields are filled
My schema is as follows:
{ title: "Artikkel",
name: "article",
type: "reference",
to: [{ type: articleDocument.name }], description: "Lenke til en artikkel pÄ Löplabbet",validation: (_Rule_: _any_) =>
_Rule_.custom((_context_: _any_) =>
_context_.article && _context_.url ? true : "Du kan ikke lenke til bÄde artikkel og ekstern URL"),
},
{ title: "URL",
name: "url",
type: "string",
description: "Lenke til en ekstern side",validation: (_Rule_: _any_) =>
_Rule_.custom((_context_: _any_) =>
_context_.url && _context_.article ? true : "Du kan ikke lenke til bÄde ekstern URL og artikkel"),
},
This shows a validation error message if both fields are in use, but I'm not able to publish. And the publish button shows this error: There are validation errors that need to be fixed before this document can be published.
I can see the issue in your validation code! The problem is with what you're returning from your rule.custom() function.
Your current validation logic is returning the opposite of what it should:
validation: (Rule: any) =>
Rule.custom((context: any) =>
context.article && context.url ? true : "Du kan ikke lenke til bÄde artikkel og ekstern URL"
),This returns true when both fields are filled (which is what you want to prevent), and shows an error when they're not both filled. You need to flip the logic.
Here's the corrected version:
{
title: "Artikkel",
name: "article",
type: "reference",
to: [{ type: articleDocument.name }],
description: "Lenke til en artikkel pÄ Löplabbet",
validation: (Rule) =>
Rule.custom((value, context) => {
// Show error if BOTH article and url are filled
if (context.parent?.article && context.parent?.url) {
return "Du kan ikke lenke til bÄde artikkel og ekstern URL";
}
return true; // Valid in all other cases
}),
},
{
title: "URL",
name: "url",
type: "string",
description: "Lenke til en ekstern side",
validation: (Rule) =>
Rule.custom((value, context) => {
// Show error if BOTH url and article are filled
if (context.parent?.url && context.parent?.article) {
return "Du kan ikke lenke til bÄde ekstern URL og artikkel";
}
return true; // Valid in all other cases
}),
},Key changes:
- Use
context.parentto access sibling fields (as explained in the Sanity validation docs) - Return the error message string when the validation fails (both fields filled)
- Return
truewhen validation passes (any other case)
The validation function should return:
trueif the value is valid- A string error message if the value is invalid
You had these reversed in your original code, which is why it was blocking publishing even when validation should pass.
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