Sanity Studio Vision查询报错：unexpected token ","问题求助

我正在学习React Native课程，采用Sanity作为后端服务，已完成featured、restaurant、dish及category的schema配置并在Sanity Studio中填充数据。在Vision面板执行以下GROQ查询时：

*[_type == "featured"]{
        ...,
        restuarants[]=> {
          ...,
          dishes[]=> ,
            type=> {
              name
            }
        },
      }

出现错误提示：unexpected token ",", expected expression。我已对照教程代码检查、谷歌搜索，但问题已持续2天仍未解决，作为Sanity查询新手，请求协助排查问题。

附上我的schema代码：

featured schema #

export default {
  name: 'featured',
  title: 'featured Menu Categories',
  type: 'document',
  fields: [
    {
      name: 'name',
      type: 'string',
      title: 'Featured category name',
      validation: (Role) => Role.required(),
    },
    {
      name: 'short_description',
      type: 'string',
      title: 'Short description',
      validation: (Role) => Role.max(200),
    },
    {
      name: 'restuarants',
      type: 'array',
      title: 'Restuarants',
      of: [{ type: 'reference', to: [{ type: 'restuarant' }] }],
    },
  ],
};

restaurant schema #

export default {
  name: 'restaurant',
  title: 'Restuarant',
  type: 'document',
  fields: [
    {
      name: 'name',
      type: 'string',
      title: 'Restuarant name',
      validation: (Role) => Role.required(),
    },
    {
      name: 'short_description',
      type: 'string',
      title: 'Short description',
      validation: (Role) => Role.max(200),
    },
    {
      name: 'image',
      type: 'image',
      title: 'Image of the Restuarant',
    },
    {
      name: 'lat',
      type: 'number',
      title: 'latitude of the restaurant',
    },
    {
      name: 'long',
      type: 'number',
      title: 'longitude of the restaurant,
    },
    {
      name: 'address',
      type: 'string',
      title: 'Address of the Restuarant',
      validation: (Role) => Role.required(),
    },
    {
      name: 'rating',
      type: 'number',
      title: 'Enter a rating of (1 - 5)',
      validation: (Role) =>
        Role.required()
          .min(1)
          .max(5)
          .error('please enter a number between 1 - 5'),
    },
    {
      name: 'type',
      type: 'string',
      title: 'Category',
      validation: (Role) => Role.required(),
      type: 'reference',
      to: [{ type: 'category' }],
    },
    {
      name: 'dishes',
      type: 'array',
      title: 'Dishes',
      of: [{ type: 'reference', to: [{ type: 'dish' }] }],
    },
  ],
};

1. GROQ查询语法错误（直接报错原因） #

查询中dishes[]=> ,这一行末尾多了冗余逗号，且type=>的缩进结构不符合GROQ语法规范。修正后的查询如下：

*[_type == "featured"]{
  ...,
  restuarants[]=> {
    ...,
    dishes[]=>,
    type=> {
      name
    }
  }
}

如果需要获取dishes的全部字段，dishes[]=>后无需逗号；若仅需部分字段，需写成dishes[]=> { 字段名1, 字段名2 }。

2. Restaurant Schema中的两处语法错误 #

虽不直接导致本次查询报错，但会引发Sanity Studio运行异常，建议同步修正：

• long字段的title值缺少闭合引号，修正后：

  {
    name: 'long',
    type: 'number',
    title: 'longitude of the restaurant',
  },
  

• type字段重复定义type属性，需删除冗余的type: 'string'，保留引用类型定义：

  {
    name: 'type',
    title: 'Category',
    validation: (Role) => Role.required(),
    type: 'reference',
    to: [{ type: 'category' }],
  },
  

3. 拼写一致性问题 #

注意到你在schema中将restaurant拼写成restuarant（少一个字母a），虽当前查询可匹配，但后续开发易因拼写不一致引发问题，建议统一修正为restaurant（含字段名、文档类型名等）。

内容的提问来源于stack exchange，提问作者MegaMindTheCoder