I have a search view which collects a search term from a user and then 
passes them to the search result view.  The results view is constructed in 
two parts:

1) basic server side rendering which builds the overall structure of the 
page and includes a search form
2) ActionCable delivers rendered search results after the longish running 
search has completed, these views also contain a form

The form from bullet 1 works as expected.  The form(s) from bullet 2 fail 
CSRF checks.

My understanding is that CSRF tokens are added to the session when the page 
is rendered.  As such, the first form works as it has reference to the 
session.  The forms generated in bullet 2 are done so by ActiveJob and then 
the rendered view is delivered to the browser via ActionCable.  I believe 
that there is no session mapping here.

Can anyone suggest a good approach to correctly allowing form submission 
with CSRF prevention in place on a form delivered asynchronously from an 
ActiveJob via ActionCable?

I know I can get the browser to re-write the async tokens with javascript 
but that feels like quite a hack.

Thanks,
Dave 

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