Class: Decoding::Decoders::At

Inherits:
Decoding::Decoder show all
Defined in:
lib/decoding/decoders/at.rb

Overview

Decode a value in deeply nested hashes.

See Also:

Instance Method Summary collapse

Methods inherited from Decoding::Decoder

#failure, #to_decoder

Constructor Details

#initialize(*keys, decoder) ⇒ At

Returns a new instance of At.

Parameters:



13
14
15
16
17
 
# File 'lib/decoding/decoders/at.rb', line 13

def initialize(*keys, decoder)
  @keys = keys.to_a
  @decoder = decoder.to_decoder
  super()
end

Instance Method Details

#call(value) ⇒ Deceoding::Result<a>

Parameters:

  • value (Object)

Returns:

  • (Deceoding::Result<a>) 


21
22
23
24
25
26
27
 
# File 'lib/decoding/decoders/at.rb', line 21

def call(value)
  first, *rest = @keys.reverse
  nested_decoder = rest.reduce(Decoders::Field.new(first, @decoder)) do |acc, k|
    Decoders::Field.new(k, acc)
  end
  nested_decoder.call(value)
end