node.js - 错误 : cyclic dependency detected with Mongo + Nodejs Project

Question

美好的一天:

我目前正在从事 NodeJs + MongoDB 项目。我的解决方案很简单，我有 3 个集合(Client、Scope、Grant)。 Scope 在 Client 和 Grant 集合之间形成多对多关系。目前我正在查询一个 Client 记录，然后获取分配给该 Client 的所有 Scope 集合，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 }

一件有趣的事，我发现这是导致问题的代码，但是，我不知道为什么 console.log(grants.toArray());

Answer 1

在 mongoose 连接中，像这样将 autoIndex 设置为 false:

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