feat: 🎸 Nickname API を実装した

app/controllers/api/v1/nicknames_controller.rb

@@ -0,0 +1,19 @@
+module Api
+  module V1
+    class NicknamesController < ApplicationController
+      def index
+        render json: Nickname.pluck(:name)
+      end
+
+      def show
+        nickname = Nickname.find_by(name: params[:name])
+
+        if nickname.blank?
+          render json: []
+        else
+          render json: nickname.gss_characters.pluck(:name)
+        end
+      end
+    end
+  end
+end

config/routes.rb

@@ -3,6 +3,7 @@
   namespace :api, { format: 'json' } do
     namespace :v1 do
       resources :stars, only: [:index]
+      resources :nicknames, only: %i[index show], param: :name
     end
   end
 end

spec/requests/api/v1/nicknames_spec.rb

@@ -0,0 +1,35 @@
+require 'rails_helper'
+
+RSpec.describe 'Api::V1::Nicknames', type: :request do
+  describe 'GET /index' do
+    it 'returns http success' do
+      get '/api/v1/nicknames'
+
+      expect(response).to have_http_status(:success)
+      expect(Nickname.count).to be > 500
+    end
+  end
+
+  describe 'GET /show' do
+    it 'returns http success' do
+      # 坊ちゃん
+      get '/api/v1/nicknames/%E5%9D%8A%E3%81%A1%E3%82%83%E3%82%93'
+
+      expect(response).to have_http_status(:success)
+    end
+
+    it 'returns expected contents' do
+      # 坊ちゃん
+      get '/api/v1/nicknames/%E5%9D%8A%E3%81%A1%E3%82%83%E3%82%93'
+
+      expect(response.body).to eq '["幻水1主人公（坊ちゃん）"]'
+    end
+
+    it 'Nickname が存在しない場合は空っぽのレスポンスであること' do
+      get '/api/v1/nicknames/hogehoge'
+
+      expect(response).to have_http_status(:success)
+      expect(response.body).to eq '[]'
+    end
+  end
+end