From 7bd832c9bd77ec5c9427b8162ba005d75c113690 Mon Sep 17 00:00:00 2001
From: 2458773093 <2458773093@protonmail.com>
Date: Mon, 22 Jul 2019 02:50:01 +0300
Subject: [PATCH] better migrations for unread count field on group accounts
 table

---
 ...0190721214831_add_unread_count_to_group_accounts.rb |  9 +++++++--
 ...4917_backfill_add_unread_count_to_group_accounts.rb | 10 ++++++++++
 db/schema.rb                                           |  2 +-
 3 files changed, 18 insertions(+), 3 deletions(-)
 create mode 100644 db/migrate/20190721234917_backfill_add_unread_count_to_group_accounts.rb

diff --git a/db/migrate/20190721214831_add_unread_count_to_group_accounts.rb b/db/migrate/20190721214831_add_unread_count_to_group_accounts.rb
index 8a9f19df..efe77fd7 100644
--- a/db/migrate/20190721214831_add_unread_count_to_group_accounts.rb
+++ b/db/migrate/20190721214831_add_unread_count_to_group_accounts.rb
@@ -1,5 +1,10 @@
 class AddUnreadCountToGroupAccounts < ActiveRecord::Migration[5.2]
-  def change
-    add_column :group_accounts, :unread_count, :integer, default: 0
+  def up
+    add_column :group_accounts, :unread_count, :integer
+    change_column_default :group_accounts, :unread_count, 0
+  end
+
+  def down
+    remove_column :group_accounts, :unread_count
   end
 end
diff --git a/db/migrate/20190721234917_backfill_add_unread_count_to_group_accounts.rb b/db/migrate/20190721234917_backfill_add_unread_count_to_group_accounts.rb
new file mode 100644
index 00000000..e71fb1b0
--- /dev/null
+++ b/db/migrate/20190721234917_backfill_add_unread_count_to_group_accounts.rb
@@ -0,0 +1,10 @@
+class BackfillAddUnreadCountToGroupAccounts < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    GroupAccount.in_batches do |relation|
+      relation.update_all unread_count: 0
+      sleep(0.1)
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b3aaf19c..d9bf6f1e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_07_21_214831) do
+ActiveRecord::Schema.define(version: 2019_07_21_234917) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"