Fix name resolving error on export (#2612)

* Fix name resolving error on export

* Fix exporter service spec

app/services/exporter/service.rb

@@ -5,8 +5,8 @@ module Exporter
     attr_reader :user
 
     EXPORTERS = [
-      Articles,
-      Comments,
+      Exporter::Articles,
+      Exporter::Comments,
     ].freeze
 
     def initialize(user)
@@ -18,7 +18,7 @@ module Exporter
 
       # export content with filenames
       EXPORTERS.each do |exporter|
-        files = exporter.new(user).export(config.fetch(exporter.name.to_sym, {}))
+        files = exporter.new(user).export(config.fetch(exporter.name.demodulize.downcase.to_sym, {}))
         files.each do |name, content|
           exports[name] = content
         end

spec/services/exporter/service_spec.rb

@@ -59,6 +59,15 @@ RSpec.describe Exporter::Service do
       expect(exports.length).to eq(described_class::EXPORTERS.size)
     end
 
+    it "fetches the passed config" do
+      service = valid_instance(article.user)
+      config = double
+      allow(config).to receive(:fetch).with(:articles, {}).and_return(slug: article.slug)
+      allow(config).to receive(:fetch).with(:comments, {}).and_return({})
+      service.export(config: config)
+      expect(config).to have_received(:fetch).with(:articles, {})
+    end
+
     context "when emailing the user" do
       it "delivers one email" do
         service = valid_instance(article.user)