Can’t find documents searching by ObjectId using Mongoose

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A couple tips:

  • Try running the same query from mongodb at the command line, see if you get any results.
  • Is the “campaign_id” defined as an ObjectId in your schema? If so, try searching using the ObjectId type.

For example:

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

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