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Custom `MarshalJSON()` ignores `omitempty` #82

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ieure opened this issue Jan 8, 2022 · 0 comments

Contributor

ieure commented Jan 8, 2022

I have a schema with a UUID property. It has a regexp to validate its contents, but isn't marked as required:

"uuid": {
    "type": "string",
    "pattern": "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$"
}

Non-required fields get an omitempty added to their json struct tag:

	Uud string `json:"uuid,omitempty"`

However, MarshalJSON doesn't understand omitempty, so it always emits the field:

{"uuid": ""}

This causes schema validation to fail, since the empty string doesn't match the declared pattern.

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