Question

美好的一天：

我目前正在研究NodeJs + MongoDB项目。我的解决方案很简单，我有3个集合（Client，Scope，Grant）。范围形成了客户与客户之间的多对多关系。授予收藏。目前我正在查询客户端记录，然后将所有 Scope 集合分配给该客户端，最后获取所有 Grant我之前查询过的 Scope 集合中的记录。这是我的代码：

getClient (clientId, clientSecret, callback) {
 let that = this;
 this.mongoClient.collection('client').findOne({"client" : clientId, "client_secret" : clientSecret}, function (err, client) {
     if (err) {
         return callback(err, null);
     } 
     that.mongoClient.collection('scope').find({'client_id': client._id}, {"service_id":1}, function(err, serviceIds) {
         that.mongoClient.collection('grant').find({'_id': { $exists : true, $in : serviceIds }}, function(err, grants) { 
             console.log(grants.toArray());
             callback(err, client);
         })
     });


 });
}

当我运行我的代码时，我得到了这个：

Promise {


 <rejected> Error: cyclic dependency detected
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:296:33)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at serializeObject (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:308:18)
    at serializeInto (/home/vagrant/api/node_modules/bson/lib/bson/parser/serializer.js:776:17)
    at BSON.serialize (/home/vagrant/api/node_modules/bson/lib/bson/bson.js:58:27)
    at Query.toBin (/home/vagrant/api/node_modules/mongodb-core/lib/connection/commands.js:140:25)
    at Pool.write (/home/vagrant/api/node_modules/mongodb-core/lib/connection/pool.js:986:23)
    at Cursor._find (/home/vagrant/api/node_modules/mongodb-core/lib/cursor.js:286:22)
    at nextFunction (/home/vagrant/api/node_modules/mongodb-core/lib/cursor.js:591:10)
    at Cursor.next [as _next] (/home/vagrant/api/node_modules/mongodb-core/lib/cursor.js:699:3)
    at fetchDocs (/home/vagrant/api/node_modules/mongodb/lib/cursor.js:857:10)
    at toArray (/home/vagrant/api/node_modules/mongodb/lib/cursor.js:884:3)
    at /home/vagrant/api/node_modules/mongodb/lib/cursor.js:841:5
    at Promise (<anonymous>)
    at Cursor.toArray (/home/vagrant/api/node_modules/mongodb/lib/cursor.js:840:10)
    at /home/vagrant/api/services/TokenService.js:20:25 }

有一件事很有意思，我发现这是导致问题的代码，但我很遗憾为什么console.log(grants.toArray());

Answer 1

在mongoose connect中，将autoIndex设置为false，如下所示：

    mongoose.connect('mongodb://localhost:27017/gscoo', {autoIndex: false});

Answer 2

我认为问题与clientId和clientSecret的类型有关。例如，它们可以是对象，而预期会有变量。如果它们是对象，则应将其转换为变量。否则，重要的是检查clientId和clientSecret中是否没有任何产生解析问题的字符。

Answer 3

您可以删除MongoDB连接字符串末尾的选项。

Answer 4

我不小心在 $set 操作中插入了一个集合，这导致了那个错误。

由于错误中没有有用的堆栈跟踪，我不得不稍微调试一下，直到发现操作失败。

所以也许您的 $set 操作格式不正确，例如由于交换了参数的损坏的函数调用。

在我找到真正的原因之前，我转而考虑升级 bson。但是最新的 bson 包仅包含在 mongodb 4.0 中，目前处于测试阶段。

错误：使用Mongo + Nodejs项目检测到循环依赖性

4 个答案: