Render JSON

.ruby-version

@@ -1 +1 @@
-ruby-3.0.4
+ruby-2.7.4

Gemfile

@@ -7,3 +7,4 @@ gem 'puma', '~> 6.0'
 gem 'connection_pool', '2.2.2'
 gem 'pg', '1.2.3'
 gem 'sinatra', '2.0.8.1'
+gem 'sinatra-contrib', '2.0.8.1'

Gemfile.lock

@@ -1,7 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    backports (3.23.0)
     connection_pool (2.2.2)
+    multi_json (1.15.0)
     mustermann (1.1.2)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
@@ -17,9 +19,17 @@ GEM
       rack (~> 2.0)
       rack-protection (= 2.0.8.1)
       tilt (~> 2.0)
+    sinatra-contrib (2.0.8.1)
+      backports (>= 2.8.2)
+      multi_json
+      mustermann (~> 1.0)
+      rack-protection (= 2.0.8.1)
+      sinatra (= 2.0.8.1)
+      tilt (~> 2.0)
     tilt (2.0.11)
 
 PLATFORMS
+  ruby
   x86_64-linux
 
 DEPENDENCIES
@@ -27,6 +37,7 @@ DEPENDENCIES
   pg (= 1.2.3)
   puma (~> 6.0)
   sinatra (= 2.0.8.1)
+  sinatra-contrib (= 2.0.8.1)
 
 BUNDLED WITH
    2.4.6

main.rb

@@ -4,6 +4,7 @@
 require 'connection_pool'
 require 'pg'
 require 'sinatra'
+require 'sinatra/json'
 
 $DB_POOL = ConnectionPool.new size: 5, timeout: 5 do
   PG.connect(
@@ -16,18 +17,14 @@ $DB_POOL = ConnectionPool.new size: 5, timeout: 5 do
   end
 end
 
-before do
-  headers 'X-Frame-Options' => ''
-end
-
 get '/examples' do
   $DB_POOL.with do |db_conn|
     ids =
       case params[:ids]
-      when Array then params[:ids].map { |id| Integer id }
-      when String then params[:ids].split(',').map { |id| Integer id }
+      when Array then params[:ids]
+      when String then params[:ids].split(',')
       else raise 'Invalid param "ids"'
-      end
+      end.map { |id| Integer id }
 
     examples = db_conn.exec_params(
       (
@@ -54,12 +51,6 @@ get '/examples' do
       [PG::TextEncoder::Array.new.encode(ids)],
     ).map { |row| row['values'] }
 
-    <<~HTML
-      <ul>
-        #{examples.map do |example|
-          "<li>#{example[0]} &mdash; #{example[1]}</li>"
-        end.join}
-      </ul>
-    HTML
+    json examples
   end
 end