class CrConfig::Providers::EnvVarProvider

• CrConfig::Providers::EnvVarProvider
• CrConfig::Providers::AbstractProvider
• Reference
• Object

Overview

Provider that looks up configurations from environment variables

Environment variable names are downcased and _ characters get replaced by a .. i.e. CLIENT_HOST will change into client.host . Can optionally be constructed with a prefix that will be removed from environment variable names so it can align with the correct configuration name.

# constructing this...
CrConfig::Providers::EnvVarProvider.new("MY_SERVER_")

# ...will cause this environment variable to be set for "client.host"
ENV["MY_SERVER_CLIENT_HOST"] = "different.example.com"

Defined in:

cr-config/abstract_provider.cr

Constructors

• .new(prefix : String = "")

  prefix is an optional parameter for defining the environment variable prefixes

Instance Method Summary

• #populate(builder : AbstractBuilder)

  This method gets called with the instance of the configuration builder during config building.

Constructor Detail

Instance Method Detail