找不到使用Mongoose通过ObjectId搜索的文档

Question

  Campaign.find {client_id:req.param('client_id')}, (error, campaigns) ->
    if error
      response =
        error: error.message
    else
      for campaign in campaigns
        query =
          campaign_id: campaign._id
        console.log query
        CampaignResponse.find query, (err, campaignResponsesCount) ->
          console.log campaignResponsesCount

      response = campaigns

    res.json response

出于某种原因,这不会返回任何结果.但是,有CampaignResponse具体的项目campaign._id.我很确定这是类型和演员的问题,但我无法弄清楚该怎么做.

有帮助吗？

Answer 1

一对小贴士:

• 尝试在命令行中从mongodb运行相同的查询,看看是否得到任何结果.
• "campaign_id"是否在架构中定义为ObjectId？如果是这样,请尝试使用ObjectId类型进行搜索.

例如:

var ObjectId = require('mongoose').Types.ObjectId; 
var query = { campaign_id: new ObjectId(campaign._id) };

Answer 2

只是为了改进以前的(正确的)答案,我在我的项目中使用:

String.prototype.toObjectId = function() {
  var ObjectId = (require('mongoose').Types.ObjectId);
  return new ObjectId(this.toString());
};

// Every String can be casted in ObjectId now
console.log('545f489dea12346454ae793b'.toObjectId());

Answer 3

通过比较您的参数而不是使用ObjectId来查找,只需使用Campaign.findById {req.param('client_id'),function(err,docs)} ....

当使用objectId查找文档时,findById是最有效的方法...