Auto-update signature count on petition page.

[dracos]

This fetches the JSON of the petition every 10 seconds and updates the count, and progress bar, accordingly, with a pretty counting animation.

[pixeltrix]

The method petition_page? is just a check for the controller and action name but we know that if it's true then the @petition instance variable is set so just use the Petition#open? method to achieve what you need, e.g:

petition_page? && @petition.open?

Hopefully that's clearer?

[dracos]

Ah, great, thanks, I still don't get my head around where variables are magically available in ruby :)

[pixeltrix]

The reason that archived_petition_page isn't in the fragment.yml file is that the head section isn't dependent on that - it's got :url in the list so would change anyway.

[dracos]

Ah, of course, makes sense, thanks. Think only thing I don't understand now is the Keys class in CacheHelper, but I don't really need to to tidy this up ;) Fixes pushed.

[pixeltrix]

Think only thing I don't understand now is the Keys class in CacheHelper

That's just a simple decorator around the template context so that we can return the values in the way that we need. Mostly it's simple delegations but some are slightly more complicated. It then creates the cache key for each item in the list of dependencies.

[pixeltrix]

@dracos one more thing - I think creating a signature count API would be useful - there's no need to pull all of the JSON data just to get the signature count.

[pixeltrix]

Closing in favour of the fixed #512 - thanks @dracos