Hello everybody !
This is a question I have already posted on Stack Overflow
<https://stackoverflow.com/questions/35546853/sqlalchemy-dynamic-customized-collection-class>,
but as none is answering I decided to post it here too :) However I invite
you to go to the Stack Overflow page, as it is maybe more clearly explained
than here.
I have a One-To-Many relation between an Article entity and a Post entity
(which are the comments on the article).
Each Post has a date attribute.
What I would like to do is getting the posts related to an article between
two dates directly from this article, using the following syntax :
article.posts[start_date:end_date]
With the "lazy" argument or "relationship", I can do :
posts = relationship('Post', back_populates='article', lazy='dynamic')
After that, the "posts" attribute isn't a list any longer, but a Query
Object, which allows us to do:
article.posts.filter(Post.date >= start_date, Post.date <
end_date).all()
Which is still not exactly what I'm looking for.
I think I have to use the "collection_class" attribute of the relationship,
by using a custom Class in which I would override the "__getitem__" method,
but I don't know what to write in this function, because we don't have
access to the query given by the `relationship` Object !
Does someone have an idea which could help me ?
Thank you !
Edouard
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