Sinatra::ConfigFile is an extension that allows you to load the application's configuration from YAML files. It automatically detects if the files contains specific environment settings and it will use the corresponding to the current one.
You can access those options through settings within the application. If you try to get the value for a setting that hasn’t been defined in the config file for the current environment, you will get whatever it was set to in the application.
Once you have written your configurations to a YAML file you can tell the extension to load them. See below for more information about how these files are interpreted.
For the examples, lets assume the following config.yml file:
greeting: Welcome to my file configurable application
require "sinatra" require "sinatra/config_file" config_file 'path/to/config.yml' get '/' do @greeting = settings.greeting haml :index end # The rest of your classic application code goes here...
require "sinatra/base" require "sinatra/config_file" class MyApp < Sinatra::Base register Sinatra::ConfigFile config_file 'path/to/config.yml' get '/' do @greeting = settings.greeting haml :index end # The rest of your modular application code goes here... end
In its most simple form this file is just a key-value list:
foo: bar something: 42 nested: a: 1 b: 2
But it also can provide specific environment configuration. There are two ways to do that: at the file level and at the setting level. They are illustrated, repsectively, as follows:
development: foo: development bar: bar test: foo: test bar: bar production: foo: production bar: bar
and
foo: development: development test: test production: production bar: bar
In either case, settings.foo will return the environment name, and settings.bar will return "bar".
Be aware that if you have a different environment, besides development, test and production, you will also need to adjust the environments setting, otherwise the settings will not load. For instance, when you also have a staging environment:
set :environments, %w{development test production staging}
If you wish to provide defaults that may be shared among all the environments, this can be done by using one of the existing environments as the default using the YAML alias, and then overwriting values in the other environments:
development: &common_settings foo: 'foo' bar: 'bar' production: <<: *common_settings bar: 'baz' # override the default value
Loads the configuration from the YAML files whose paths are passed as arguments, filtering the settings for the current environment. Note that these paths can actually be globs.
# File lib/sinatra/config_file.rb, line 126 def config_file(*paths) Dir.chdir(root || '.') do paths.each do |pattern| Dir.glob(pattern) do |file| $stderr.puts "loading config file '#{file}'" if logging? document = IO.read(file) document = ERB.new(document).result if file.split('.').include?('erb') yaml = config_for_env(YAML.load(document)) || {} yaml.each_pair do |key, value| for_env = config_for_env(value) set key, for_env unless value and for_env.nil? and respond_to? key end end end end end
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