RethinkDB：​​Javascript - 如何删除嵌套对象

我在尝试从表中删除嵌套对象而不意外删除过程中的所有数据时遇到了相当大的困难（现在发生了三次，感谢上帝我制作了副本）。

我的对象：

{
  "value1": thing,
  "value2": thing,
  "value3": thing,
  "roles": {
    "1": {
      "name": "Dave",
      "id": "1"
    },
    "2": {
      "name": "Jeff",
      "id": "2"
    },
    "3": {
      "name": "Rick",
      "id": "3"
    },
    "4": {
      "name": "Red",
      "id": "4"
    }
  }
}`

我已经尝试了一些重新思考查询，但到目前为止没有一个有效。应该注意的是，1、2、3 和 4 是可以具有任意数量数字的变量，因此我的查询必须反映这一点。

一些尝试的查询：

function removeRole(id, roleName) {
        let role = `${roleName}`
        return this.r.table('guilds').get(id).replace(function(s){
            return s.without({roles : {[role] : { "name": role }}})
        })
    }

function removeRole(id, roleName) {
        return this.r.table('guilds').getAll(id).filter(this.r.replace(this.r.row.without(roleName))).run()
    }

function removeRole(id, roleName) {
        return this.r.table('guilds').get(id)('roles')(roleName).delete()
    }

非常感谢任何帮助，如果问题有问题，请告诉我。对此仍然相当陌生，因此感谢反馈。

我不确定我是否理解您的意图，但以下查询似乎可以实现您想要完成的任务：

r.db('test')
  .table('test')
  .get(id)
  .replace((doc) => {
    // This expression makes sure that we delete the specified keys only
    const roleKeys = doc
      .getField('roles')
      .values()
      // Make sure we have a role name is in the names array
      .filter(role => r.expr(names).contains(role.getField('name')))
      // This is a bit tricky, and I believe I implemented this in a not efficient
      // way probably missing a first-class RethinkDB expression that supports
      // such a case out of box. Since we are going to delete by nested dynamic
      // ids, RethinkDB requires special syntax to denote nested ids:
      //     {roles: {ID_1: true, ID_2: true}}
      // Well, this is just a JavaScript syntax workaround, so we're building
      // such an object dynamically using fold.
      .fold({}, (acc, role) => acc.merge(r.object(role.getField('id'), true)));
    return doc.without({roles: roleKeys});
  })

例如，如果names是一个数组，比如说['Jeff', 'Rick']，嵌套的roleKeys表达式将被动态评估为：

{2: true, 3: true}

即合并到roles选择器，上面的查询将转换文档如下：

{
  "value1": ...,
  "value2": ...,
  "value3": ...,
  "roles": {
    "1": {"name": "Dave", "id": "1"},
    "4": {"name": "Red", "id": "4"}
  }
}