How to paginate a linked list?

[arikan]

In the context of an activity stream, events are connected as a linked list via "next" edge, so we get things ordered by default. A query like this in a rails controller would return the last 20 events sorted:

events = last_event.incoming("next").depth(20)

What would be the strategy to paginate this query? 

Feeding back the id of last event as a parameter from rails view to the controller and finding it via Lucene and call this query would work but, there should be smarter way I feel. Or is there a way so that "will_paginate" gem can handle linked lists as well?

Thanks,

Burak

[Andreas Ronge]

Hi

Maybe not without some hacking.

The following classes in Neo4j supports pagination, see https://github.com/dnagir/neo4j-will_paginate/blob/master/lib/neo4j-will_paginate.rb. 

For example does Neo4j::Core::Traversal::Traverser support pagination.

So maybe you can try to get the last_event.incoming("next").depth(20) return a Neo4j::Core::Traversal::Traverser instead.

Or as an alternative you can try to let the object returned by last_event.incoming("next").depth(20) support will paginate by including the  Neo4j

::WillPaginate::Pagination mixin in the object retured by last_event.incoming("next").depth(20).

Pull Request are welcome :)

Cheers 

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