Fixed SQL query incompatibility between sqlite and postgres

app.rb

@@ -76,11 +76,11 @@ get '/services/:slug' do
   @min = @service.payments.min(:amount)
   
   @results = repository(:default).adapter.query("
-    SELECT s.id, s.name AS supplier_name, s.slug AS supplier_slug, SUM(p.amount) AS total
+    SELECT s.name AS supplier_name, s.slug AS supplier_slug, SUM(p.amount) AS total
     FROM payments p, suppliers s
     WHERE p.supplier_id = s.id
     AND p.service_id = #{@service.id}
-    GROUP BY s.id
+    GROUP BY s.name, s.slug
     ORDER BY total DESC")
 
   haml :service