Feed view is not working properly with sqllite

[yarsanich]

Hi,

Thanks for Flask implementation of realworld backend app.

I tried to launch it with sqllite as db. I got an error on feed view.

flask-realworld-example-app/conduit/articles/views.py

Lines 118 to 120 in b49f301

	def articles_feed(limit=20, offset=0):
	return Article.query.join(current_user.profile.follows). \
	order_by(Article.createdAt.desc()).offset(offset).limit(limit).all()

returned

AttributeError: 'AppenderQuery' object has no attribute 'is_selectable'

I saw that UserProfile follows relation has defined join, but looks like it is not working properly. I did not try to launch it with PostgreSQL, maybe issue related to DB.

Explicit join works fine

return Article.query.join(UserProfile).join(followers_assoc, (followers_assoc.c.followed_by == Article.author_id)).\
        filter(followers_assoc.c.follower == user_profile_id).\
        order_by(Article.createdAt.desc()).offset(offset).limit(limit).all()