Default Rails primary_key and references to string (monkey patch)

id_as_string_monkey_patches.rb

# By default, rails expects id's to be a integer
# In our app, we store id's as strings.
#
# To make our life easier, instead of always having to remember this
# and explicitly telling rails the id is a string, I'm going to monkey
# patch some migrations and AR methods.
module CoreExtensions
  module ActiveRecord
    module ConnectionAdapters
      module ReferenceDefinition
        def initialize(name, options = {})
          options.reverse_merge!(
            type: :string,
          )

          super
        end
      end

      module TableDefinition
        def primary_key(name, type = :string, **options)
          # Only overide primary_key when options[:nil] is not set
          # It will be set, when a custom primary_key type is passed
          # for create_table, e.g:
          #
          # create_table :table, id: :custom_type do ...
          #
          # see:
          # https://github.com/rails/rails/blob/d357da68ff06d10bc074f84eb09b4d9144c4136f/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb#L299
          if options[:id].nil? && type == :primary_key
            type = :string
          end

          super
        end
      end
    end
  end
end

# Add monkey patches
ActiveRecord::ConnectionAdapters::ReferenceDefinition.prepend(
  CoreExtensions::ActiveRecord::ConnectionAdapters::ReferenceDefinition
)

ActiveRecord::ConnectionAdapters::TableDefinition.prepend(
  CoreExtensions::ActiveRecord::ConnectionAdapters::TableDefinition
)

Change types from :string to :uuid to default to auto generated uuid primary keys, when on postgresql adapter.