only= does not work if model_form is EmbeddedDocument

[Alexmod]

Example:

class Profile(db.EmbeddedDocument):     
    login = db.StringField()            
    pw_hash = db.StringField()    
    admin = db.BooleanField()     

                                                                                       
class Users(db.Document):      
    _id = db.ObjectIdField()
    stocks = db.DictField() 
    profile = db.EmbeddedDocumentField(Profile) 

If I use exclude like this, then everything is OK:

from flask_mongoengine.wtf import model_form 

form = model_form(Users, exclude=('profile__login'))(request.form)

And the form is generated without the field login.

But if I do like this:

form = model_form(Users, only=('profile__login'))(request.form)

Then nothing is generated.
I use flask-mongoengine Version 0.9.5

P.S.: Thanks to maintainers who support this project.

[insspb]

@Alexmod
Thank you for report, and excuse for long answer. In general we are not supporting profile__login style syntax for form fields include exclude. Fields are not provided in this style by mongoengine.

But for interest, I checked how you got such results.

Not clear what you mean under first statement, with exclude, when you say that everything is OK. I checked in debug logger right on you example, and I still see login field. Maybe you did not found it.

For only case everything is simple, such field completely not exist under Users, so you got nothing.

I will keep this case in head, but closing this issue, as pretty sure that it will be very hard and dirty to implement. At least for old model_form. I am working on version 2.0.0 with new forms generator, maybe I will include workaround there.