Errors NotRegistered flask-mongoengine Tutorial

[juvasquezg]

Hi,

I started this Turial, Here

And get this error

**mongoengine.errors.NotRegistered: ** `Comment` has not been registered in the document registry. Importing the document class automatically registers it, has it been imported?

any idea.
Thank you So much.

[dvdme]

You have to put the Comment class before the Post class.

Check this Stackoverflow answer

[juvasquezg]

Thank you!!

[dvdme]

No problem!
Also, I had thisTypeError while testing flask-tumblelog and a couple of other example apps like this one:

TypeError: __init__() got an unexpected keyword argument 'snapshot'

It happens always when I retrive data from mongodb.

This only happened with pymongo 3.0.
To fix it, downgrade pymongo to 2.8.

pip install pymongo==2.8