Module: Decanter::Core::ClassMethods

Defined in:
lib/decanter/core.rb

Instance Method Summary collapse

Instance Method Details

#decant(args) ⇒ Object 



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# File 'lib/decanter/core.rb', line 52

def decant(args)
  return {} unless args.present?
  args = args.to_unsafe_h.with_indifferent_access if args.class.name == 'ActionController::Parameters'
  {}.merge( unhandled_keys(args) )
    .merge( handled_keys(args) )
end

#decanter_for_handler(handler) ⇒ Object 



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# File 'lib/decanter/core.rb', line 150

def decanter_for_handler(handler)
  if specified_decanter = handler[:options][:decanter]
    Decanter::decanter_from(specified_decanter)
  else
    Decanter::decanter_for(handler[:assoc])
  end
end

#handle(handler, args) ⇒ Object 



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# File 'lib/decanter/core.rb', line 97

def handle(handler, args)
  values = args.values_at(*handler[:name])
  values = values.length == 1 ? values.first : values
  self.send("handle_#{handler[:type]}", handler, values)
end

#handle_association(handler, args) ⇒ Object 



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# File 'lib/decanter/core.rb', line 109

def handle_association(handler, args)
  assoc_handlers = [
    handler,
    handler.merge({
      key:   handler[:options].fetch(:key, "#{handler[:name]}_attributes").to_sym,
      name:  "#{handler[:name]}_attributes".to_sym
    })
  ]

  assoc_handler_names = assoc_handlers.map { |_handler| _handler[:name] }

  case args.values_at(*assoc_handler_names).compact.length
  when 0
    {}
  when 1
    _handler = assoc_handlers.detect { |_handler| args.has_key?(_handler[:name]) }
    self.send("handle_#{_handler[:type]}", _handler, args[_handler[:name]])
  else
    raise ArgumentError.new("Handler #{handler[:name]} matches multiple keys: #{assoc_handler_names}.")
  end
end

#handle_has_many(handler, values) ⇒ Object 



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# File 'lib/decanter/core.rb', line 131

def handle_has_many(handler, values)
  decanter = decanter_for_handler(handler)
  if values.is_a?(Hash)
    parsed_values = values.map do |index, input_values|
      next if input_values.nil?
      decanter.decant(input_values)
    end
    return { handler[:key] => parsed_values }
  else
    {
      handler[:key] => values.compact.map { |value| decanter.decant(value) }
    }
  end
end

#handle_has_one(handler, values) ⇒ Object 



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# File 'lib/decanter/core.rb', line 146

def handle_has_one(handler, values)
  { handler[:key] => decanter_for_handler(handler).decant(values) }
end

#handle_input(handler, args) ⇒ Object 



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# File 'lib/decanter/core.rb', line 103

def handle_input(handler, args)
   values = args.values_at(*handler[:name])
   values = values.length == 1 ? values.first : values
   parse(handler[:key], handler[:parsers], values, handler[:options])
end

#handled_keys(args) ⇒ Object 



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# File 'lib/decanter/core.rb', line 83

def handled_keys(args)
  arg_keys = args.keys.map(&:to_sym)
  inputs, assocs = handlers.values.partition { |handler| handler[:type] == :input }

  {}.merge(
    # Inputs
    inputs.select     { |handler| (arg_keys & handler[:name]).any? }
          .reduce({}) { |memo, handler| memo.merge handle_input(handler, args) }
  ).merge(
    # Associations
    assocs.reduce({}) { |memo, handler| memo.merge handle_association(handler, args) }
  )
end

#handlers ⇒ Object 



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# File 'lib/decanter/core.rb', line 172

def handlers
  @handlers ||= {}
end

#has_many(assoc, **options) ⇒ Object 



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# File 'lib/decanter/core.rb', line 27

def has_many(assoc, **options)
  handlers[assoc] = {
    assoc:   assoc,
    key:     options.fetch(:key, assoc),
    name:    assoc,
    options: options,
    type:    :has_many
  }
end

#has_one(assoc, **options) ⇒ Object 



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# File 'lib/decanter/core.rb', line 37

def has_one(assoc, **options)
  handlers[assoc] = {
    assoc:   assoc,
    key:     options.fetch(:key, assoc),
    name:    assoc,
    options: options,
    type:    :has_one
  }
end

#input(name, parsers = nil, **options) ⇒ Object 



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# File 'lib/decanter/core.rb', line 10

def input(name, parsers=nil, **options)

  _name = [name].flatten

  if _name.length > 1 && parsers.blank?
    raise ArgumentError.new("#{self.name} no parser specified for input with multiple values.")
  end

  handlers[_name] = {
    key:     options.fetch(:key, _name.first),
    name:    _name,
    options: options,
    parsers:  parsers,
    type:    :input
  }
end

#parse(key, parsers, values, options) ⇒ Object 



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# File 'lib/decanter/core.rb', line 158

def parse(key, parsers, values, options)
  case
  when !parsers
    { key => values }
  when options[:required] == true && Array.wrap(values).all? { |value| value.nil? || value == "" }
    raise ArgumentError.new("No value for required argument: #{key}")
  else
    Parser.parsers_for(parsers)
          .reduce({key => values}) do |vals_hash, parser|
            vals_hash.keys.reduce({}) { |acc, k| acc.merge(parser.parse(k, vals_hash[k], options)) }
          end
  end
end

#strict(mode) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/decanter/core.rb', line 47

def strict(mode)
  raise( ArgumentError.new("#{self.name}: Unknown strict value #{mode}")) unless [:with_exception, true, false].include? mode
  @strict_mode = mode
end

#strict_mode ⇒ Object 



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# File 'lib/decanter/core.rb', line 176

def strict_mode
  @strict_mode.nil? ? Decanter.configuration.strict : @strict_mode
end

#unhandled_keys(args) ⇒ Object

protected



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# File 'lib/decanter/core.rb', line 61

def unhandled_keys(args)
  unhandled_keys = args.keys.map(&:to_sym) -
    handlers.keys.flatten.uniq -
    handlers.values
      .select { |handler| handler[:type] != :input }
      .map { |handler| "#{handler[:name]}_attributes".to_sym }

  if unhandled_keys.any?
    case strict_mode
    when true
      p "#{self.name} ignoring unhandled keys: #{unhandled_keys.join(', ')}."
      {}
    when :with_exception
      raise ArgumentError.new("#{self.name} received unhandled keys: #{unhandled_keys.join(', ')}.")
    else
      args.select { |key| unhandled_keys.include? key }
    end
  else
    {}
  end
end