How to set encryption for heroku and non heroku environment?

[michaelsalexander83]

Using latest versions of everything as of today

ruby '2.6.3'
gem 'rails', '~> 5.2.3'

I need encryption on both the development ( keys local ) and Heroku.
Is there a way or example to define both in 1 config file?
the documentation seems to implicate it only generates a config for 1 specific environment ( for example heroku but not both heroku for production and local keys for development )

symmetric-encryption --generate --app-name dashboard --environments "development,staging,production"

vs

symmetric-encryption --generate --keystore heroku --app-name dashboard --environments "development,staging,production"

I have now used the local key storage config and restarted the application.
However im recieving a

PG::InvalidTextRepresentation: ERROR:  invalid input syntax for integer: "QEVuQwFAEAA6rNoDFpB+L5nTTd.. etcetera"
: SELECT COUNT(*) FROM "organisation" WHERE "requests"."organisation_id" = $1 AND (created_at < '2018-06-30 22:14:37.525186')

Did i miss something in the instructions?
This seems like a great solution thank you for providing it.