Rails: Sprockets::Rails::Helper::AssetNotPrecompiled in development

Neither of these worked for me (rails-5.0.7, sprockets-3.7.2, sprockets-rails-3.2.1):

config.assets.debug = false
config.assets.unknown_asset_fallback = true

But this did:

config.assets.check_precompiled_asset = false

//= link_directory ../javascripts .js

adding this to
app/assets/config/manifest.js
worked for me (working on rails 6)

Changing assets.debug did not work for me in Rails v5.1.5. I had to use this option: config.assets.unknown_asset_fallback = true

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