我有三个型号，项目转让和类别（又名项目类型）： class Item < ApplicationRecord
belongs_to :category
has_many :transfers
end
class Transfer < ApplicationRecord
belongs_to :item
end
class Category < Applic
下面的代码返回两个级联的JSON字符串和一个错误的内容类型text/plain。应该是application/vnd.api+json package main
import (
"github.com/google/jsonapi"
"github.com/labstack/echo"
"net/http"
)
type Album struct {