simpler cache key for talk page

[adrienpoly]

close #566

poke @jmarsh24

[jmarsh24]

There is an array of watched talks, could we instead just cache a true or false value for watched instead of caching the talk for a user. That way the cache is shared amongst all the users instead of per user. 🧐

[adrienpoly]

yeah good idea, I look into that this being said I need to check if the user is not somehow required for something else in the _talk partial

[jmarsh24]

@adrienpoly I believe the watched boolean alone is sufficient for the cache key, as a talk cannot be marked as watched if the user is not signed in. Including signed_in seems redundant in this case.

[adrienpoly]

if the user is not signed in we currently don't display the button at all. So I still need that information unless we change that and always display the watched button.

That would be a more significant change as for unsigned user clicking on that button should display the signin/up modale.