Module: Chamber::SystemEnvironment

Extended by:
Environmentable
Defined in:
lib/chamber/system_environment.rb

Class Method Summary collapse

Methods included from Environmentable

with_environment

Class Method Details

.extract_from(settings, parent_keys = []) ⇒ Object

Internal: Allows the environment variable-compatible variables to be extracted from a passed in hash.

Examples:

###
# Extracts the environment variables based on the hash keys
#
SystemEnvironment.extract_from(
  level_one_1: {
    level_two_1: 'value 1',
    level_two_2: {
      level_three_1: 'value 2' } } )

# => {
  'LEVEL_ONE_1_LEVEL_TWO_1'               => 'env value 1',
  'LEVEL_ONE_1_LEVEL_TWO_2_LEVEL_THREE_1' => 'env value 2',
}

###
# Can extract environment variables if said variables are prefixed
#
SystemEnvironment.extract_from({
                                level_two_1: 'value 1',
                                level_two_2: 'value 2'
                              },
                              ['prefix'])

# => {
  'PREFIX_LEVEL_TWO_1' => 'value 1',
  'PREFIX_LEVEL_TWO_2' => 'value 2',
}



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# File 'lib/chamber/system_environment.rb', line 45

def self.extract_from(settings, parent_keys = [])
  with_environment(settings, parent_keys,
    ->(key, value, environment_keys) do
      extract_from(value, environment_keys)
    end,
    ->(key, value, environment_key) do
      { environment_key => value.to_s }
    end)
end