class Realize::Logical::Switch

This type of transformer can be categorized as a “comparator”, meaning its intended desire is not a value resolution or value formatting, but a branching resolution. Specifically, you can define cases where, if the value matches, the transformers for the case would be executed. If no case is matched then the default_transformers will be executed.

Attributes

cases[R]
default_transformers[R]
key[R]

Public Class Methods

new(key:, cases: [], default_transformers: []) click to toggle source
# File lib/realize/logical/switch.rb, line 24
def initialize(key:, cases: [], default_transformers: [])
  raise ArgumentError, 'key is required' if key.to_s.empty?

  @cases                = Case.array(cases)
  @default_transformers = Transformers.array(default_transformers)
  @key                  = key

  freeze
end

Public Instance Methods

transform(resolver, value, time, record) click to toggle source
# File lib/realize/logical/switch.rb, line 34
def transform(resolver, value, time, record)
  resolved_value = resolver.get(record, key)
  matched_case   = cases.find { |c| c.match?(resolved_value) }
  transformers   = matched_case ? matched_case.transformers : default_transformers

  return value if transformers.empty?

  transformers.inject(value) do |memo, transformer|
    transformer.transform(resolver, memo, time, record)
  end
end