When a collection is empty, don't render anything

[ronaldtse]

When a collection is empty, there is no need to render.

Instead, apply render_nil: true behavior when specified. Right now render_nil only works on elements not on collections.

[HassanAkbar]

@ronaldtse I tried to run the below code and it does not render anything if the collection is empty.

require 'shale'
require 'shale/adapter/nokogiri'
Shale.xml_adapter = Shale::Adapter::Nokogiri

class Address < Shale::Mapper
  attribute :city, Shale::Type::String
  attribute :street, Shale::Type::String
  attribute :zip, Shale::Type::String, collection: true
  
  xml do
    root "address"

    map_element "city", to: :city
    map_element "street", to: :street
    map_element "zip", to: :zip
  end
end

address = Address.from_xml(<<~DATA)
  <address>
    <city>London</city>
    <street>Oxford Street</street>
  </address>
DATA

puts address.to_xml(pretty: true)

the above code outputs the following XML

<address>
  <city>London</city>
  <street>Oxford Street</street>
</address>

Do you mean something else here?