Class: Remap::Selector::Key

Inherits:
Unit
  • Object
show all
Defined in:
lib/remap/selector/key.rb

Overview

Selects value at key from state

Examples:

Select the value at key :name from a hash

state = Remap::State.call({ name: "John" })
selector = Remap::Selector::Key.new(:name)

selector.call(state) do |state|
  state.fetch(:value)
end

Instance Method Summary collapse

Instance Method Details

#call(state) {|| ... } ⇒ State<U>

Selects #key from state and passes it to block

Parameters:

  • state (State<Hash<K, V>>)

Yield Parameters:

Yield Returns:

Returns:



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# File 'lib/remap/selector/key.rb', line 28

def call(state, &block)
  unless block
    raise ArgumentError, "The key selector requires an iteration block"
  end

  hash = state.fetch(:value) { return state }

  unless hash.is_a?(Hash)
    state.fatal!("Expected hash got %s", hash.class)
  end

  value = hash.fetch(key) do
    state.ignore!("Key [%s] (%s) not found", key, key.class)
  end

  state.set(value, key: key).then(&block)
end

#key ⇒ #hash

Returns #hash.

Returns:

  • (#hash) —

    #hash



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# File 'lib/remap/selector/key.rb', line 18

attribute :key, Types::Key