Created
February 6, 2012 22:15
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class DbLog < ActiveRecord::Base | |
belongs_to :loggable, :polymorphic => true | |
module Loggable | |
extend ActiveSupport::Concern | |
included do | |
has_many :db_logs, :foreign_key => "loggable_id" if self.respond_to?(:has_many) | |
end | |
def log_name | |
DbLog.silence! do | |
"#{self.class.name}:#{self.id}:#{Date.today}" | |
end | |
end | |
def log | |
DbLog.silence! do | |
@dblog ||= DbLog.find_or_create_by_name(self.log_name) | |
end | |
end | |
module ClassMethods | |
def unloggable(method_name) | |
#[terry] don't overwrite methods that are = or ? or dblog'd already or are id | |
#puts "checking method_name: #{method_name}" | |
method_defined?("#{method_name}_with_dblog") || | |
method_name =~ /dblog/ || | |
method_name =~ /db_log/ || | |
%w(log_name log).include?(method_name) || | |
method_name =~ /=|\?/ || | |
method_name =~ /callback/ || | |
method_name == 'id' || | |
(respond_to?(:reflect_on_all_associations) && self.reflect_on_all_associations.map(&:name).include?(method_name.to_sym)) | |
end | |
def method_added(name) | |
return if unloggable(name.to_s) | |
#puts "ACM'ing #{name}" | |
define_method "#{name}_with_dblog" do |*args| | |
DbLog.log(self) do | |
send("#{name}_without_dblog", *args) | |
end | |
end | |
alias_method_chain name, :dblog | |
end | |
end | |
end | |
def log | |
self.content | |
end | |
def flush | |
self.class.unregister(self) | |
self.save! | |
end | |
def write(message) | |
self.content ||= "" | |
self.content << "\n#{message}" | |
end | |
#[terry] taken from http://rails.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html bc we need | |
#to support STI. | |
def loggable_type=(stype) | |
super(stype.to_s.classify.constantize.base_class.to_s) | |
end | |
class << self | |
def listeners=(set) | |
@listeners = set | |
end | |
def listeners | |
@listeners ||= Set.new | |
end | |
def register(log) | |
listeners << log | |
end | |
def unregister(log) | |
listeners.delete(log) | |
end | |
def silence! | |
begin | |
old_listeners, listeners = listeners, Set.new | |
yield | |
ensure | |
listeners = old_listeners | |
end | |
end | |
def write(message) | |
listeners.each do |listener| | |
listener.write(message) | |
end | |
message | |
end | |
def flush | |
listeners.each do |listener| | |
listener.flush | |
end | |
end | |
def log(scope, &block) | |
if scope.respond_to?(:db_logs) | |
log = scope.db_logs.build(:name => scope.log_name) | |
else | |
name = scope.respond_to?(:log_name) ? scope.log_name : scope.to_s | |
log = DbLog.find_or_create_by_name(name) | |
end | |
begin | |
DbLog.register(log) | |
return yield | |
ensure | |
log.flush | |
end | |
end | |
end | |
end | |
# == Schema Information | |
# | |
# Table name: db_logs | |
# | |
# id :integer(4) not null, primary key | |
# content :text | |
# loggable_type :string(255) | |
# loggable_id :integer(4) | |
# created_at :datetime | |
# updated_at :datetime | |
# |
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