```ruby
class AddDataToPayModels < ActiveRecord::Migration[4.2]
  def change
    add_column :pay_subscriptions, :data, data_column_type
    add_column :pay_charges, :data, data_column_type
  end

  def data_column_type
    case ActiveRecord::Base.configurations.default_hash.dig("adapter")
    when "mysql2"
      :json
    when "postgresql"
      :jsonb
    else
      :text
    end
  end
end
```

Fix data column migration for Rails 6.1
user
```ruby
class AddDataToPayModels < ActiveRecord::Migration[4.2]
  def change
    add_column :pay_subscriptions, :data, data_column_type
    add_column :pay_charges, :data, data_column_type
  end

  def data_column_type
    default_hash = ActiveRecord::Base.configurations.default_hash

    # Rails 6.1 uses a symbol key instead of a string
    adapter = default_hash.dig(:adapter) || default_hash.dig("adapter")

    case adapter
    when "mysql2"
      :json
    when "postgresql"
      :jsonb
    else
      :text
    end
  end
end
```
assistant