Add default value to datatype array in Rails migration

Question

I was trying to create a field which is datatype of Array through migration and it did got updated in schema.rb file.

However my main goal was to give fixed value to this field (ie Array), which is not going to change in future. Kind of static value.

I applied this method to create a field.

rails generate migration Store_detailsToAdmin store_details:string

Admin.rb file.

serialize :store_details, Array
rake db:migrate

Can anyone help me have default and fixed values on this column?

Answer 1

Set default value as "xyz"

class Admin < ApplicationRecord
  serialize : store_details, Array
  after_initialize -> { self. store_details.blank? ? self. store_details.push('xyz') : self. store_details }
end

Get default value of it if array is blank

admin.store_details => ["xyz"]

Add another value in it

admin.store_details.push("abc")
admin.save
admin.store_details => ["xyz", "abc"]