Add Tag to api

app/models/tag.rb

@@ -0,0 +1,3 @@
+class Tag < ActsAsTaggableOn::Tag
+  scope :public_for_api, -> { where("kind IS NULL OR kind = 'category'") }
+end

config/initializers/graphql.rb

@@ -5,6 +5,7 @@ API_TYPE_DEFINITIONS = {
   Comment  => %I[ id commentable_id commentable_type body created_at cached_votes_total cached_votes_up cached_votes_down ancestry confidence_score public_author ],
   Geozone  => %I[ id name ]
   ProposalNotification => %I[ title body proposal_id created_at proposal ],
+  Tag => %I[ id name taggings_count kind ],
 }
 
 type_creator = GraphQL::TypeCreator.new

spec/models/tag_spec.rb

@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+describe 'Tag' do
+
+  describe "public_for_api scope" do
+    it "returns tags whose kind is NULL" do
+      tag = create(:tag, kind: nil)
+
+      expect(Tag.public_for_api).to include(tag)
+    end
+
+    it "returns tags whose kind is 'category'" do
+      tag = create(:tag, kind: 'category')
+
+      expect(Tag.public_for_api).to include(tag)
+    end
+
+    it "blocks other kinds of tags" do
+      tag = create(:tag, kind: 'foo')
+
+      expect(Tag.public_for_api).not_to include(tag)
+    end
+  end
+end