n Rails 6，通过迁移向表添加小数列的正确方法是什么？

Question

I just upgraded to Rails 6.1.4.4 and a migration that previously passed in Rails 4 fails in the new set up. It is

class AddLatLngToStores < ActiveRecord::Migration[4.2]
  def change
    add_column :stores, :lat, :decimal, {:precision=>10, :scale=>6}
    add_column :stores, :lng, :decimal, {:precision=>10, :scale=>6}
  end
end

Now I get the error when I run “rake db:migrate”

-- add_column(:stores, :lat, :decimal, {:precision=>10, :scale=>6})
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

wrong number of arguments (given 4, expected 3)

What's the proper way to add a column in Rails 6?

Answer 1

Always good to reference the official docs, here's for the add_column method: https://api.rubyonrails.org/v7.0.4/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_column

If you want to stick to the hash syntax for some reason what you had should still work as long as you drop the curly braces.