You try folliwing the documentation of gem(sorry my ignorance I don't know anything about sinatra)?:
Documentation dotenv
Install the gem:
$ gem install dotenv
By default, load will look for a file called .env in the current working directory. Pass in multiple files and they will be loaded in order. The first value set for a variable will win.
require 'dotenv'
Dotenv.load('file1.env', 'file2.env')
In your case i think should be:
require 'dotenv'
Dotenv.load('.env.development')
In ruby vanilla I dont know if possible, I think yes.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…