Module: AMA::Entity::Mapper::Mixin::Reflection

Includes:
Errors
Included in:
Context, DSL::ClassMethods, Handler::Attribute::Validator, Handler::Entity::Denormalizer, Handler::Entity::Denormalizer, Handler::Entity::Enumerator, Handler::Entity::Enumerator, Handler::Entity::Factory, Handler::Entity::Injector, Handler::Entity::Injector, Handler::Entity::Normalizer, Handler::Entity::Normalizer, Handler::Entity::Validator, Type, Type::Attribute
Defined in:
lib/ama-entity-mapper/mixin/reflection.rb

Overview

Collection of common methods twiddling with object internals

Instance Method Summary collapse

Methods included from Errors

#compliance_error, #mapping_error, #raise_if_internal, #validation_error

Instance Method Details

#install_object_method(object, name, handler) ⇒ Object 



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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 46

def install_object_method(object, name, handler)
  compliance_error('Handler not provided') unless handler
  object.define_singleton_method(name, &handler)
  object
end

#method_object(method, to_s: nil, &handler) ⇒ Object 



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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 52

def method_object(method, to_s: nil, &handler)
  object = install_object_method(Object.new, method, handler)
  unless to_s
    to_s = "Wrapper object for proc #{handler} " \
      "(installed as method :#{method})"
  end
  object.define_singleton_method(:to_s) do
    to_s
  end
  object
end

#object_variable(object, name) ⇒ Object

Parameters:

  • object (Object)
  • name (String, Symbol) 


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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 37

def object_variable(object, name)
  name = "@#{name}" unless name[0] == '@'
  object.instance_variable_get(name)
end

#object_variable_exists(object, name) ⇒ Object 



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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 42

def object_variable_exists(object, name)
  object.instance_variables.include?("@#{name}".to_sym)
end

#object_variables(object) ⇒ Object

Parameters:

  • object (Object) 


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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 28

def object_variables(object)
  intermediate = object.instance_variables.map do |variable|
    [variable[1..-1].to_sym, object.instance_variable_get(variable)]
  end
  Hash[intermediate]
end

#set_object_attribute(object, name, value) ⇒ Object

Parameters:

  • object (Object)
  • name (String, Symbol)
  • value (Object) 


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# File 'lib/ama-entity-mapper/mixin/reflection.rb', line 16

def set_object_attribute(object, name, value)
  method = "#{name}="
  return object.send(method, value) if object.respond_to?(method)
  object.instance_variable_set("@#{name}", value)
rescue StandardError => e
  message = "Failed to set attribute #{name} on #{object.class}, " \
    "this is most likely due to `#{method}` method not following " \
    'accessor conventions'
  mapping_error(message, parent: e)
end