How to use countries gem to generate a list of country names as JSON

I am building a rails api and need to send all country as JSON using AMS. I am able to fetch the countries but not able to send it as JSON. I get the error: undefined method [] for nil class

def index countries = Country.all render json: countries, serializer: CountrySerializer end 

class CountrySerializer < ActiveModel::Serializer attributes(:name) end 

I am expecting the JSON response to be an array like

[ England, Netherland ] 

I was hoping I could make use of serializers so I could translate the names in different languages

1 Answer

Per your comment, serializers are configured to work with Rails models, and your data is coming from the countries gem.

If all you need is the name attribute you can do:

def index countries = Country.all render json: { countries: ISO3166::Country.all.map(&:name) } end