Added migration for adding slug, is_private, is_visible, tags, category to group

• Added:
- migration for adding slug, is_private, is_visible, tags, category to group

db/migrate/20200801023407_add_columns_to_groups.rb

@@ -0,0 +1,19 @@
+class AddColumnsToGroups < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_column :groups, :slug, :text
+    add_column :groups, :is_private, :boolean
+    add_column :groups, :is_visible, :boolean
+    add_column :groups, :tags, :string, array: true
+    
+    add_reference :groups, :group_categories, index: false
+    add_index :groups, :group_categories_id, algorithm: :concurrently
+
+    change_column_default :groups, :is_private, false
+    change_column_default :groups, :is_visible, true
+    change_column_default :groups, :tags, []
+
+    add_index :groups, :slug, unique: true, algorithm: :concurrently
+  end
+end