total_count support

[andreiavram]

total_count is sent by Redmine to all of the lists and is really useful especially when "paginating" results.

One issue might be the fact that with lazy-evaluating Resources / ResourceSets, total_count will not be available until AFTER evaluation, so forcing evaluation might be necessary (e.g calling list(issue_list)). However, total_count is especially useful when working with a subset (limit, offset) of resources, so evaluating the whole set might not be such a big problem.

[maxtepkeev]

Thanks, but it wasn't that simple actually.

First of all not all resources support limit/offset via Redmine directly, so I had to mimic this feature on the Python side for resources that needs it.

Also there are ResourceSet's which aren't created via all() and filter() methods but created automatically when requested from some other resource, e.g. project.custom_fields, for such ResourceSet's the total_count attribute returns the current available amount of resources that ResourceSet currently holds.

Lastly the total_count attribute doesn't belong to the ResourceManager in any way, so I moved it to the ResourceSet. To make that work I completely refactored the ResourceManager's retrieve() method which already violated the DRY principles so this is a good thing and I planned to do that anyway.

Once again thanks for the ideas. Waiting for new ones ;-)