fix pg view

db/migrate/20191017233918_init_view.rb

@@ -0,0 +1,9 @@
+class InitView < ActiveRecord::Migration[5.2]
+  def up
+    BadgePostsViewManager.create!
+  end
+
+  def down
+    BadgePostsViewManager.drop!
+  end
+end

lib/badge_posts_view_manager.rb

@@ -5,7 +5,7 @@ class BadgePostsViewManager
 
   def self.create!
     sql = <<~SQL
-    CREATE VIEW #{VIEW_NAME} AS
+    CREATE OR REPLACE VIEW #{VIEW_NAME} AS
     SELECT p.*
     FROM posts p
     JOIN topics t ON t.id = p.topic_id
@@ -19,23 +19,9 @@ def self.create!
     SQL
 
     DB.exec(sql)
-    raise "Failed to create '#{VIEW_NAME}' view" unless badge_posts_view_exists?
   end
 
   def self.drop!
-    DB.exec("DROP VIEW #{VIEW_NAME}")
-    raise "Failed to drop '#{VIEW_NAME}' view" if badge_posts_view_exists?
-  end
-
-  def self.badge_posts_view_exists?
-    sql = <<~SQL
-    SELECT 1
-    FROM pg_catalog.pg_views
-    WHERE schemaname
-    IN ('public')
-    AND viewname = '#{VIEW_NAME}';
-    SQL
-
-    DB.exec(sql) == 1
+    DB.exec("DROP VIEW IF EXISTS #{VIEW_NAME}")
   end
 end