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Editorial Team
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Asked: 2026-06-09T10:42:47+00:00

I have a Sinatra app which uses DataMapper as it’s ORM, it’s deployed to

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I have a Sinatra app which uses DataMapper as it’s ORM, it’s deployed to Heroku, but I want to change the database details.

Right now before my Models, I’m connecting to my DB like this, but I want to use a yml file to manage the connections details.

DataMapper.setup(:default, ENV['DATABASE_URL'] || "sqlite3::memory:")

If I have a file thats at config/database.yml, how can I change the DataMapper.setup to use the proper ENV? This way I can remove the need for sqlite3 as I’ll be running Postgres locally too.

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  1. Editorial Team

    As far as I know, DataMapper doesn’t parse .yml. You can look at https://github.com/merb/merb_datamapper/blob/master/lib/merb_datamapper/connection.rb to see how .yml config is consumed in Merb framework.

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