change column type in rails with example

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 class ChangePhoneToBeStringInCustomers < ActiveRecord::Migration[5.0]

  def up
    change_column :customers, :phone, :string
  end

  def down
    change_column :customers, :phone, :integer
  end
end


The code we need to add takes the form of
  change_column :table_name, :column_name, :new_type
In our case it would be something like
  change_column :customers, :phone, :string
The completed file will look like this
class ChangePhoneToBeStringInCustomers < ActiveRecord::Migration[5.0]
  def change
    change_column :customers, :phone, :string
  end
end

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