Class: Avromatic::Model::Attribute::Union

Inherits:
Virtus::Attribute
  • Object
show all
Defined in:
lib/avromatic/model/attribute/union.rb

Overview

This subclass of Virtus::Attribute is used for any unions that are defined as subclasses of the primitive Avromatic::Model::AttributeType::Union. Values are coerced by first checking if they already match one of the member types, and then by attempting to coerce to each member type in order.

Constant Summary collapse

MEMBER_INDEX = 
::Avromatic::IO::DatumReader::UNION_MEMBER_INDEX

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Union

Returns a new instance of Union.



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# File 'lib/avromatic/model/attribute/union.rb', line 18

def initialize(*)
  super

  primitive.types.each do |type|
    member_attributes << Virtus::Attribute.build(type)
  end
end

Instance Method Details

#coerce(input) ⇒ Object 



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# File 'lib/avromatic/model/attribute/union.rb', line 26

def coerce(input)
  return input if value_coerced?(input)

  result = nil
  if input && input.key?(MEMBER_INDEX)
    result = safe_coerce(member_attributes[input.delete(MEMBER_INDEX)], input)
  else
    member_attributes.find do |union_attribute|
      result = safe_coerce(union_attribute, input)
    end
  end
  result
end

#value_coerced?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/avromatic/model/attribute/union.rb', line 40

def value_coerced?(value)
  member_attributes.any? do |union_attribute|
    union_attribute.value_coerced?(value)
  end
end