What’s Mongoose error Cast to ObjectId failed for value XXX at path “_id”?

by

Mongoose’s findById method casts the id parameter to the type of the model’s _id field so that it can properly query for the matching doc. This is an ObjectId but "foo" is not a valid ObjectId so the cast fails.

This doesn’t happen with 41224d776a326fb40f000001 because that string is a valid ObjectId.

One way to resolve this is to add a check prior to your findById call to see if id is a valid ObjectId or not like so:

if (id.match(/^[0-9a-fA-F]{24}$/)) {
  // Yes, it's a valid ObjectId, proceed with `findById` call.
}

More Related Contents:

  1. MEAN app vs. Mongo service local in Angular2
  2. Does MongoDB’s $in clause guarantee order
  3. Find document with array that contains a specific value
  4. Node.js Mongoose.js string to ObjectId function
  5. How to paginate with Mongoose in Node.js?
  6. Cascade style delete in Mongoose
  7. mongoDB/mongoose: unique if not null
  8. Mongoose Unique index not working!
  9. Find MongoDB records where array field is not empty
  10. Mongoose — Force collection name
  11. arrayFilters in mongodb
  12. Creating Multifield Indexes in Mongoose / MongoDB
  13. MongoDB password with “@” in it
  14. Unhandled promise rejection: Error: URL malformed, cannot be parsed
  15. How to return Mongoose results from the find method?
  16. Exception: can’t convert from BSON type EOO to Date
  17. MongoDB: output ‘id’ instead of ‘_id’
  18. How to return just the nested documents of an array from all documents
  19. MongoDB: Calculate dwell time between every status value change
  20. MongoDB: how to parse date in 3.6 mongoDb version?
  21. Mongoose’s find method with $or condition does not work properly
  22. Dealing with schema changes in Mongoose
  23. Does Mongoose support the Mongodb `findAndModify` method?
  24. Delete a key from a MongoDB document using Mongoose
  25. Can’t find documents searching by ObjectId using Mongoose
  26. Mongodb aggregation $group, restrict length of array
  27. Mongoose.js instance.save() callback not firing
  28. querying a collection without passing schema in mongoose
  29. Fuzzy Searching with Mongodb?
  30. Find documents whose array field contains at least n elements of a given array

Leave a Comment