Modify tags api index to allow for bulk GET of tags (#16417)

app/controllers/api/v0/tags_controller.rb

@@ -3,17 +3,19 @@ module Api
     class TagsController < ApiController
       before_action :set_cache_control_headers, only: %i[index]
 
-      ATTRIBUTES_FOR_SERIALIZATION = %i[id name bg_color_hex text_color_hex].freeze
+      ATTRIBUTES_FOR_SERIALIZATION = %i[id name bg_color_hex text_color_hex short_summary badge_id].freeze
       private_constant :ATTRIBUTES_FOR_SERIALIZATION
 
       def index
+        @tags = Tag.includes(:badge).select(ATTRIBUTES_FOR_SERIALIZATION)
+
         page = params[:page]
         per_page = (params[:per_page] || 10).to_i
         num = [per_page, 1000].min
 
-        @tags = Tag.select(ATTRIBUTES_FOR_SERIALIZATION)
-          .order(taggings_count: :desc)
-          .page(page).per(num)
+        @tags = @tags.where(id: params[:tag_ids]) if params[:tag_ids].present?
+
+        @tags = @tags.order(taggings_count: :desc).page(page).per(num)
 
         set_surrogate_key_header Tag.table_key, @tags.map(&:record_key)
       end

app/views/api/v0/tags/index.json.jbuilder

@@ -1,3 +1,10 @@
 json.array! @tags.each do |tag|
-  json.extract!(tag, :id, :name, :bg_color_hex, :text_color_hex)
+  json.extract!(tag, :id, :name, :bg_color_hex, :text_color_hex, :short_summary)
+  json.badge do
+    if tag.badge
+      json.badge_image tag.badge.badge_image
+    else
+      json.badge_image nil
+    end
+  end
 end

spec/requests/api/v0/tags_spec.rb

@@ -11,16 +11,19 @@ RSpec.describe "Api::V0::Tags", type: :request do
     end
 
     it "returns tags with the correct json representation" do
+      badge = create(:badge)
       tag = create(:tag, taggings_count: 10)
+      tag_with_badge = create(:tag, taggings_count: 5, badge: badge)
 
       get api_tags_path
 
       response_tag = response.parsed_body.first
-      expect(response_tag.keys).to match_array(%w[id name bg_color_hex text_color_hex])
-      expect(response_tag["id"]).to eq(tag.id)
-      expect(response_tag["name"]).to eq(tag.name)
-      expect(response_tag["bg_color_hex"]).to eq(tag.bg_color_hex)
-      expect(response_tag["text_color_hex"]).to eq(tag.text_color_hex)
+      response_tag_with_badge = response.parsed_body.last
+      expect_valid_json_body(response_tag, tag)
+      expect_valid_json_body(response_tag_with_badge, tag_with_badge)
+
+      expect(response_tag["badge"]["badge_image"]).to be_nil
+      expect(response_tag_with_badge["badge"]["badge_image"]["url"]).to eq(tag_with_badge.badge.badge_image.url)
     end
 
     it "orders tags by taggings_count in a descending order" do
@@ -33,6 +36,15 @@ RSpec.describe "Api::V0::Tags", type: :request do
       expect(response.parsed_body.map { |t| t["id"] }).to eq(expected_result)
     end
 
+    it "finds tags from array of tag_ids" do
+      tags = create_list(:tag, 10, taggings_count: 10)
+      tag_ids = tags.sample(4).map(&:id)
+
+      get api_tags_path, params: { tag_ids: tag_ids }
+
+      expect(response.parsed_body.map { |t| t["id"] }).to match_array(tag_ids)
+    end
+
     it "supports pagination" do
       create_list(:tag, 3)
 
@@ -52,4 +64,17 @@ RSpec.describe "Api::V0::Tags", type: :request do
       expect(response.headers["surrogate-key"].split.to_set).to eq(expected_key)
     end
   end
+
+  private
+
+  def expect_valid_json_body(body, tag)
+    expect(body.keys).to match_array(%w[id name bg_color_hex text_color_hex short_summary badge])
+    expect(body["id"]).to eq(tag.id)
+    expect(body["name"]).to eq(tag.name)
+    expect(body["bg_color_hex"]).to eq(tag.bg_color_hex)
+    expect(body["text_color_hex"]).to eq(tag.text_color_hex)
+    expect(body["short_summary"]).to eq(tag.short_summary)
+    expect(body).to have_key("badge")
+    expect(body["badge"]).to have_key("badge_image")
+  end
 end