module AMA::Entity::Mapper::Mixin::Reflection

Collection of common methods twiddling with object internals

Public Instance Methods

install_object_method(object, name, handler) click to toggle source
# 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) click to toggle source
# 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) click to toggle source

@param [Object] object @param [String, Symbol] name

# 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) click to toggle source
# 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) click to toggle source

@param [Object] object

# 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) click to toggle source

@param [Object] object @param [String, Symbol] name @param [Object] value

# 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