Hello,
Dgraph has several custom scalar types implemented for GraphQL such as DateTime, Polygon and Int64.
But there’s no ability yet to specify additional custom scalar types (and resolvers/ serialization/ validation).
The most common custom scalar types I have used so far were:
- Email,
- URI, DOI, ISRC (music records), UPC (trade items)
- PhoneNumber
- Time, Date, DateRange
- TimeCode
- Bézier
- Symbol (e.g. for a single Emoji)
- Coordinates {x: …,y: …, z: …}
- Colors: RGB(A), HEX, HSL(A),
- Array (with preserved order and duplicates),
- JSON
Of course one can always encode as a string. But what I love about Dgraph ist that it can drastically simplify my business logic and I can use it as an all-in-one backend service.
An alternative to custom scalar types would be the addition of @constraint directives for validation:
email: String! @constraint(format: "email", maxLength: 255)
As far as I understand custom remote fields or lambda fields are the recommended (?) workaround in Dgraph (without search however).
