Server side rendering issue on Heroku

[revskill10]

I'm using Rails 4.2.5, Sprocket 3.0.0.
Locally i could prerender react component using {prerender: true} .
On Heroku, if i use prerender, there's always error:

2016-01-27T08:18:55.618746+00:00 app[web.1]: ActionView::Template::Error (undefined method `[]' for nil:NilClass):
2016-01-27T08:18:55.618747+00:00 app[web.1]:     1: <%= react_component('ChiPhiIndex', {chi_phis: @chi_phis}, {prerender: true} )%>
2016-01-27T08:18:55.618749+00:00 app[web.1]:   app/views/chi_phis/index.html.erb:1:in `_app_views_chi_phis_index_html_erb___1456543064959989113_69830504130340'

If i use {prerender: false} on Heroku, the web runs well.

How to use server side rendering on Heroku with this gem ?

[rmosolgo]

Looks like the issue where some sprockets-rails versions don't have app.assets, instead they have app.manifest. Could you try this branch? #430

[revskill10]

@rmosolgo The problem is, server-side rendering works fine in local, but fails in Heroku.
So what's the difference here between local and heroku ?
Anyway, i've tested the branch. And it works!

[rmosolgo]

So what's the difference here between local and heroku ?

Local:

Rails.env #  => "development" 

Heroku:

Rails.env # => "production"

Rails has some ways that it behaves differently between development environment and production environment, and assets is one of those things that's different!

Thanks for giving it a try! I'll try to finish up that branch and merge it soon.