Support for toJSON #118
Description
I'd like to have a little different model structure internally in my app than returning it externally via API. Unfortunately, using fastify and fast-json-stringify this can't be done as fast-json-stringify does not use the objects toJSON function to map the data somehow.
I guess it could be on purpose to improve the performance, but this is a little bit unintuitive to do:
reply.send(model.toJSON());
and what even worse:
const models = [arrayOfModels];
reply.send(models.map(model => model.toJSON()));This doesn't make much sense as there's no difference if I have to do this manually or if it would be done by fast-json-stringify - just as I'd expect.
Here's a little reproduction:
const fastJson = require("fast-json-stringify");
const stringify = fastJson({
type: "object",
properties: {
groups: {
type: "array",
items: {
type: "string"
}
}
}
});
class User {
constructor() {
this.groups = [{ name: "admin" }, { name: "subscriber" }];
}
toJSON() {
return {
...this,
groups: this.groups.map(group => group.name)
};
}
}
const user = new User();
console.log(stringify(user)); // returns: {"groups":["[object Object]","[object Object]"]}
console.log(JSON.stringify(user)); // returns: {"groups":["admin","subscriber"]}Could you somehow relate to this issue? And maybe you have some idea for a solution in fastify?