Saving a model fails with mongo error: MongoError: Unknown modifier:

[shingi]

No description provided.

[shingi]

Issue reported here: Automattic/mongoose#5574

[amy-dredge-ps]

Thanks for this information @shingi! Since I can't repro, can you try updating mongoose to major version 5 and let me know if that resolves it? If not, I'll merge the pull request. If version 5 of mongoose fixes it, let me know and I'll upgrade mongoose in the repository.

[rennanbadaro]

Hey @adredge @shingi , I had the same problem and updating mongoose didn't solve it.
What worked for me was to install the same version of Mongo you're using in the video(3.4.x).

[shingi]

@rennanbadaro I don't get this particular error in Mongoose 5 but it looks there are issues related to how promises are supported in Mongoose 5 and I get the error Cannot read property 'then' of undefined. Also, use of { useMongoClient: true } is no longer supported.

[amy-dredge-ps]

Hi @rennanbadaro. Per the dependencies in the root package.json, this app was written using mongoose ^4.11. Using version 5 does not comply with the versioning there in the package.json. Of course, you're free to use whatever version you want, but I can't guarantee things will work. I will likely upgrade the app and its dependencies as time goes on. However, since it sounds like upgrading to mongoose 5 will require some significant code changes, I don't want to do that at this time. I want to keep my code in this repo consistent with the code I show in my course, and changing the structure (i.e. promises) of the code is not a good move at this time. If you want to do that however, please feel free. I'd even enjoy seeing a PR to understand what's involved.

[rennanbadaro]

Hey @adredge, I was talking about the database actually, not mongoose
Installing via brew gave me a newer version of MongoDB compared to the one you used in the video. Once I installed the same version you showed everything worked just fine

[adredge]

Alright, going to merge in the other PR that is very similar to this (this one just has an unrelated change to the .gitignore).