REST API pagination with generics in go 1.18beta1

main.go

package main

import (
	"encoding/json"
	"log"
	"net/http"
)

type Spaceship struct {
	Name   string `json:"name"`
	Length string `json:"length"`
}

type Person struct {
	Name   string `json:"name"`
	Height string `json:"height"`
}

type Response[T any] struct {
	Count int  ``
	Next string
	Results []T
}

func paginate[T any](url string) ([]T, error) {
	next := url
	responseItems := []T{}
	for next != "" {
		response, err := http.Get(next)
		if err != nil {
			return []T{}, nil
		}
		var r Response[T]; 

		err = json.NewDecoder(response.Body).Decode(&r)
		if err != nil {
			return []T{}, nil
		}

		for _, item := range r.Results {
			responseItems = append(responseItems, item)
		}

		next = r.Next
	}
	return responseItems, nil
}

func main() {
	people, err := paginate[Person]("https://swapi.py4e.com/api/people")
	log.Println("people", people, err)
	ships, err := paginate[Spaceship]("https://swapi.py4e.com/api/starships")
	log.Println("ships", ships, err)
}