how to keep a hash value in the table column in rails

The data type for that column must be text so in your migrations you can specify:

add_column :user_details, :additional_info, :text

Then in your model you have to specify that this column will contain a hash and you do that with the serialize command:

class UserDetail < ActiveRecord::Base
  serialize :additional_info

After that you can save hash information.

@ud = UserDetail.new
@ud.additional_info = {:salary => 1000000}
@ud.save

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