| Module | CouchRest::Callbacks |
| In: |
lib/couchrest/mixins/callbacks.rb
|
Callbacks are hooks into the lifecycle of an object that allow you to trigger logic before or after an alteration of the object state.
Mixing in this module allows you to define callbacks in your class.
Example:
class Storage
include ActiveSupport::Callbacks
define_callbacks :save
end
class ConfigStorage < Storage
save_callback :before, :saving_message
def saving_message
puts "saving..."
end
save_callback :after do |object|
puts "saved"
end
def save
_run_save_callbacks do
puts "- save"
end
end
end
config = ConfigStorage.new
config.save
Output:
saving... - save saved
Callbacks from parent classes are inherited.
Example:
class Storage
include ActiveSupport::Callbacks
define_callbacks :save
save_callback :before, :prepare
def prepare
puts "preparing save"
end
end
class ConfigStorage < Storage
save_callback :before, :saving_message
def saving_message
puts "saving..."
end
save_callback :after do |object|
puts "saved"
end
def save
_run_save_callbacks do
puts "- save"
end
end
end
config = ConfigStorage.new
config.save
Output:
preparing save saving... - save saved
This method_missing is supplied to catch callbacks with keys and create the appropriate callback for future use.