Feature: Inbox greeting message (#927)

Co-authored-by: Pranav Raj S <pranav@thoughtwoot.com>

db/migrate/20200605130625_agent_away_message_to_auto_reply.rb

@@ -0,0 +1,21 @@
+class AgentAwayMessageToAutoReply < ActiveRecord::Migration[6.0]
+  def change
+    add_column :inboxes, :greeting_enabled, :boolean, default: false # rubocop:disable Rails/BulkChangeTable
+    add_column :inboxes, :greeting_message, :string
+
+    migrate_agent_away_to_greeting
+
+    remove_column :channel_web_widgets, :agent_away_message, :string
+  end
+
+  def migrate_agent_away_to_greeting
+    ::Channel::WebWidget.find_in_batches do |widget_batch|
+      widget_batch.each do |widget|
+        inbox = widget.inbox
+        inbox.greeting_enabled = true
+        inbox.greeting_message = widget.agent_away_message
+        widget.save!
+      end
+    end
+  end
+end