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# frozen_string_literal: true
require "active_support/concern"
module ActiveSupport
# Actionable errors let's you define actions to resolve an error.
#
# To make an error actionable, include the <tt>ActiveSupport::ActionableError</tt>
# module and invoke the +action+ class macro to define the action.
#
# An action needs a name and a procedure to execute. The name can be shown by
# the action dispatching mechanism.
module ActionableError
extend Concern
NonActionable = Class.new(StandardError)
NoActions = Hash.new do |_, label| # :nodoc:
raise NonActionable, "Cannot find action \"#{label}\" for #{self}"
end
included do
class_attribute :_actions, default: NoActions.dup
end
def self.actions(error) # :nodoc:
case error
when String
actions(error.constantize)
when ActionableError, -> it { Class === it && it < ActionableError }
error._actions
when Exception
NoActions
else
raise NonActionable, "#{error} is non-actionable"
end
end
def self.dispatch(error, label) # :nodoc:
actions(error)[label].call
end
module ClassMethods
# Defines an action that can resolve the error.
#
# class PendingMigrationError < MigrationError
# include ActiveSupport::ActionableError
#
# action "Run pending migrations" do
# ActiveRecord::Tasks::DatabaseTasks.migrate
# end
# end
def action(label, &block)
_actions[label] = block
end
end
end
end
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