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Merge branch 'new_callbacks'

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Peter Gumeson 2009-07-18 23:37:16 -07:00
parent ce02d05eac f4f3946d86
commit 7bae8acc36
8 changed files with 344 additions and 228 deletions
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18
README.md
View file

@ -69,20 +69,26 @@ CouchRest::Model has been deprecated and replaced by CouchRest::ExtendedDocument
### Callbacks
`CouchRest::ExtendedDocuments` instances have 4 callbacks already defined for you:
`validate_callback`, `create_callback`, `save_callback`, `update_callback` and `destroy_callback`
`:validate`, `:create`, `:save`, `:update` and `:destroy`
`CouchRest::CastedModel` instances have 1 callback already defined for you:
`validate_callback`
`:validate`
Define your callback as follows:
save_callback :before, :generate_slug_from_name
set_callback :save, :before, :generate_slug_from_name
CouchRest uses a mixin you can find in lib/mixins/callbacks which is extracted from Rails 3, here are some simple usage examples:
save_callback :before, :before_method
save_callback :after, :after_method, :if => :condition
save_callback :around {|r| stuff; yield; stuff }
set_callback :save, :before, :before_method
set_callback :save, :after, :after_method, :if => :condition
set_callback :save, :around {|r| stuff; yield; stuff }
Or the new shorter version:
before_save :before_method, :another_method
after_save :after_method, :another_method, :if => :condition
around_save {|r| stuff; yield; stuff }
Check the mixin or the ExtendedDocument class to see how to implement your own callbacks.

251
lib/couchrest/mixins/callbacks.rb
View file

@ -1,8 +1,29 @@
require File.join(File.dirname(__FILE__), '..', 'support', 'class')
# Copyright (c) 2006-2009 David Heinemeier Hansson
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Extracted from ActiveSupport::NewCallbacks written by Yehuda Katz
# http://github.com/rails/rails/raw/d6e4113c83a9d55be6f2af247da2cecaa855f43b/activesupport/lib/active_support/new_callbacks.rb
# http://github.com/rails/rails/commit/1126a85aed576402d978e6f76eb393b6baaa9541
# Extracted from ActiveSupport::Callbacks written by Yehuda Katz
# http://github.com/wycats/rails/raw/abstract_controller/activesupport/lib/active_support/new_callbacks.rb
# http://github.com/wycats/rails/raw/18b405f154868204a8f332888871041a7bad95e1/activesupport/lib/active_support/callbacks.rb
require File.join(File.dirname(__FILE__), '..', 'support', 'class')
module CouchRest
# Callbacks are hooks into the lifecycle of an object that allow you to trigger logic
@ -94,9 +115,8 @@ module CouchRest
@@_callback_sequence = 0
attr_accessor :filter, :kind, :name, :options, :per_key, :klass
def initialize(filter, kind, options, klass, name)
def initialize(filter, kind, options, klass)
@kind, @klass = kind, klass
@name = name
normalize_options!(options)
@ -122,21 +142,20 @@ module CouchRest
end
def normalize_options!(options)
options[:if] = Array(options[:if])
options[:unless] = Array(options[:unless])
options[:if] = Array.wrap(options[:if])
options[:unless] = Array.wrap(options[:unless])
options[:per_key] ||= {}
options[:per_key][:if] = Array(options[:per_key][:if])
options[:per_key][:unless] = Array(options[:per_key][:unless])
options[:per_key][:if] = Array.wrap(options[:per_key][:if])
options[:per_key][:unless] = Array.wrap(options[:per_key][:unless])
end
def next_id
@@_callback_sequence += 1
end
def matches?(_kind, _name, _filter)
def matches?(_kind, _filter)
@kind == _kind &&
@name == _name &&
@filter == _filter
end
@ -185,9 +204,10 @@ module CouchRest
filter = <<-RUBY_EVAL
unless halted
result = #{@filter}
halted ||= (#{terminator})
halted = (#{terminator})
end
RUBY_EVAL
[@compiled_options[0], filter, @compiled_options[1]].compact.join("\n")
else
# Compile around filters with conditions into proxy methods
@ -206,7 +226,7 @@ module CouchRest
# end
name = "_conditional_callback_#{@kind}_#{next_id}"
txt = <<-RUBY_EVAL
txt, line = <<-RUBY_EVAL, __LINE__
def #{name}(halted)
#{@compiled_options[0] || "if true"} && !halted
#{@filter} do
@ -217,7 +237,7 @@ module CouchRest
end
end
RUBY_EVAL
@klass.class_eval(txt)
@klass.class_eval(txt, __FILE__, line)
"#{name}(halted) do"
end
end
@ -252,11 +272,11 @@ module CouchRest
conditions = []
unless options[:if].empty?
conditions << Array(_compile_filter(options[:if]))
conditions << Array.wrap(_compile_filter(options[:if]))
end
unless options[:unless].empty?
conditions << Array(_compile_filter(options[:unless])).map {|f| "!#{f}"}
conditions << Array.wrap(_compile_filter(options[:unless])).map {|f| "!#{f}"}
end
["if #{conditions.flatten.join(" && ")}", "end"]
@ -287,33 +307,42 @@ module CouchRest
filter.map {|f| _compile_filter(f)}
when Symbol
filter
when String
"(#{filter})"
when Proc
@klass.send(:define_method, method_name, &filter)
method_name << (filter.arity == 1 ? "(self)" : "")
when String
@klass.class_eval <<-RUBY_EVAL
def #{method_name}
#{filter}
return method_name if filter.arity == 0
method_name << (filter.arity == 1 ? "(self)" : " self, Proc.new ")
else
@klass.send(:define_method, "#{method_name}_object") { filter }
_normalize_legacy_filter(kind, filter)
@klass.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
def #{method_name}(&blk)
#{method_name}_object.send(:#{kind}, self, &blk)
end
RUBY_EVAL
method_name
else
kind, name = @kind, @name
@klass.send(:define_method, method_name) do
filter.send("#{kind}_#{name}", self)
end
method_name
end
def _normalize_legacy_filter(kind, filter)
if !filter.respond_to?(kind) && filter.respond_to?(:filter)
filter.class_eval(
"def #{kind}(context, &block) filter(context, &block) end",
__FILE__, __LINE__ - 1)
elsif filter.respond_to?(:before) && filter.respond_to?(:after) && kind == :around
def filter.around(context)
should_continue = before(context)
yield if should_continue
after(context)
end
end
end
# This method_missing is supplied to catch callbacks with keys and create
# the appropriate callback for future use.
def method_missing(meth, *args, &blk)
if meth.to_s =~ /_run__([\w:]+)__(\w+)__(\w+)__callbacks/
return self.class._create_and_run_keyed_callback($1, $2.to_sym, $3.to_sym, self, &blk)
end
super
end
# An Array with a compile method
@ -328,7 +357,7 @@ module CouchRest
each do |callback|
method << callback.start(key, options)
end
method << "yield self if block_given?"
method << "yield self if block_given? && !halted"
reverse_each do |callback|
method << callback.end(key, options)
end
@ -342,7 +371,7 @@ module CouchRest
end
module ClassMethods
CHAINS = {:before => :before, :around => :before, :after => :after} unless self.const_defined?("CHAINS")
#CHAINS = {:before => :before, :around => :before, :after => :after}
# Make the _run_save_callbacks method. The generated method takes
# a block that it'll yield to. It'll call the before and around filters
@ -355,41 +384,43 @@ module CouchRest
# The _run_save_callbacks method can optionally take a key, which
# will be used to compile an optimized callback method for each
# key. See #define_callbacks for more information.
def _define_runner(symbol, str, options)
str = <<-RUBY_EVAL
def _run_#{symbol}_callbacks(key = nil)
def _define_runner(symbol)
body = send("_#{symbol}_callback").
compile(nil, :terminator => send("_#{symbol}_terminator"))
body, line = <<-RUBY_EVAL, __LINE__
def _run_#{symbol}_callbacks(key = nil, &blk)
if key
send("_run__\#{self.class.name.split("::").last}__#{symbol}__\#{key}__callbacks") { yield if block_given? }
name = "_run__\#{self.class.name.hash.abs}__#{symbol}__\#{key.hash.abs}__callbacks"
unless respond_to?(name)
self.class._create_keyed_callback(name, :#{symbol}, self, &blk)
end
send(name, &blk)
else
#{str}
#{body}
end
end
RUBY_EVAL
class_eval str, __FILE__, __LINE__ + 1
before_name, around_name, after_name =
options.values_at(:before, :after, :around)
undef_method "_run_#{symbol}_callbacks" if method_defined?("_run_#{symbol}_callbacks")
class_eval body, __FILE__, line
end
# This is called the first time a callback is called with a particular
# key. It creates a new callback method for the key, calculating
# which callbacks can be omitted because of per_key conditions.
def _create_and_run_keyed_callback(klass, kind, key, obj, &blk)
def _create_keyed_callback(name, kind, obj, &blk)
@_keyed_callbacks ||= {}
@_keyed_callbacks[[kind, key]] ||= begin
str = self.send("_#{kind}_callbacks").compile(key, :object => obj, :terminator => self.send("_#{kind}_terminator"))
@_keyed_callbacks[name] ||= begin
str = send("_#{kind}_callback").
compile(name, :object => obj, :terminator => send("_#{kind}_terminator"))
self.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
def _run__#{klass.split("::").last}__#{kind}__#{key}__callbacks
#{str}
end
RUBY_EVAL
class_eval "def #{name}() #{str} end", __FILE__, __LINE__
true
end
obj.send("_run__#{klass.split("::").last}__#{kind}__#{key}__callbacks", &blk)
end
# Define callbacks.
@ -423,61 +454,79 @@ module CouchRest
# In that case, each action_name would get its own compiled callback
# method that took into consideration the per_key conditions. This
# is a speed improvement for ActionPack.
def _update_callbacks(name, filters = CallbackChain.new(name), block = nil)
type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
options = filters.last.is_a?(Hash) ? filters.pop : {}
filters.unshift(block) if block
callbacks = send("_#{name}_callback")
yield callbacks, type, filters, options if block_given?
_define_runner(name)
end
alias_method :_reset_callbacks, :_update_callbacks
def set_callback(name, *filters, &block)
_update_callbacks(name, filters, block) do |callbacks, type, filters, options|
filters.map! do |filter|
# overrides parent class
callbacks.delete_if {|c| c.matches?(type, filter) }
Callback.new(filter, type, options.dup, self)
end
options[:prepend] ? callbacks.unshift(*filters) : callbacks.push(*filters)
end
end
def skip_callback(name, *filters, &block)
_update_callbacks(name, filters, block) do |callbacks, type, filters, options|
filters.each do |filter|
callbacks = send("_#{name}_callback=", callbacks.clone(self))
filter = callbacks.find {|c| c.matches?(type, filter) }
if filter && options.any?
filter.recompile!(options, options[:per_key] || {})
else
callbacks.delete(filter)
end
end
end
end
def define_callbacks(*symbols)
terminator = symbols.pop if symbols.last.is_a?(String)
symbols.each do |symbol|
self.extlib_inheritable_accessor("_#{symbol}_terminator")
self.send("_#{symbol}_terminator=", terminator)
extlib_inheritable_accessor("_#{symbol}_terminator") { terminator }
extlib_inheritable_accessor("_#{symbol}_callback") do
CallbackChain.new(symbol)
end
_define_runner(symbol)
# Define more convenient callback methods
# set_callback(:save, :before) becomes before_save
[:before, :after, :around].each do |filter|
self.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
extlib_inheritable_accessor :_#{symbol}_callbacks
self._#{symbol}_callbacks = CallbackChain.new(:#{symbol})
def self.#{symbol}_callback(*filters, &blk)
type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
options = filters.last.is_a?(Hash) ? filters.pop : {}
filters.unshift(blk) if block_given?
filters.map! do |filter|
# overrides parent class
self._#{symbol}_callbacks.delete_if {|c| c.matches?(type, :#{symbol}, filter)}
Callback.new(filter, type, options.dup, self, :#{symbol})
def self.#{filter}_#{symbol}(*symbols, &blk)
_alias_callbacks(symbols, blk) do |callback, options|
set_callback(:#{symbol}, :#{filter}, callback, options)
end
self._#{symbol}_callbacks.push(*filters)
_define_runner(:#{symbol},
self._#{symbol}_callbacks.compile(nil, :terminator => _#{symbol}_terminator),
options)
end
def self.skip_#{symbol}_callback(*filters, &blk)
type = [:before, :after, :around].include?(filters.first) ? filters.shift : :before
options = filters.last.is_a?(Hash) ? filters.pop : {}
filters.unshift(blk) if block_given?
filters.each do |filter|
self._#{symbol}_callbacks = self._#{symbol}_callbacks.clone(self)
filter = self._#{symbol}_callbacks.find {|c| c.matches?(type, :#{symbol}, filter) }
per_key = options[:per_key] || {}
if filter
filter.recompile!(options, per_key)
else
self._#{symbol}_callbacks.delete(filter)
end
_define_runner(:#{symbol},
self._#{symbol}_callbacks.compile(nil, :terminator => _#{symbol}_terminator),
options)
end
end
def self.reset_#{symbol}_callbacks
self._#{symbol}_callbacks = CallbackChain.new(:#{symbol})
_define_runner(:#{symbol}, self._#{symbol}_callbacks.compile, {})
end
self.#{symbol}_callback(:before)
RUBY_EVAL
end
end
end
def _alias_callbacks(callbacks, block)
options = callbacks.last.is_a?(Hash) ? callbacks.pop : {}
callbacks.push(block) if block
callbacks.each do |callback|
yield callback, options
end
end
end
end
end

2
lib/couchrest/mixins/validation.rb
View file

@ -77,7 +77,7 @@ module CouchRest
base.class_eval <<-EOS, __FILE__, __LINE__
define_callbacks :validate
if method_defined?(:_run_save_callbacks)
save_callback :before, :check_validations
set_callback :save, :before, :check_validations
end
EOS
base.class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1

10
lib/couchrest/more/extended_document.rb
View file

@ -32,10 +32,10 @@ module CouchRest
attr_accessor :casted_by
# Callbacks
define_callbacks :create
define_callbacks :save
define_callbacks :update
define_callbacks :destroy
define_callbacks :create, "result == :halt"
define_callbacks :save, "result == :halt"
define_callbacks :update, "result == :halt"
define_callbacks :destroy, "result == :halt"
def initialize(passed_keys={})
apply_defaults # defined in CouchRest::Mixins::Properties
@ -59,7 +59,7 @@ module CouchRest
property(:updated_at, :read_only => true, :cast_as => 'Time', :auto_validation => false)
property(:created_at, :read_only => true, :cast_as => 'Time', :auto_validation => false)
save_callback :before do |object|
set_callback :save, :before do |object|
object['updated_at'] = Time.now
object['created_at'] = object['updated_at'] if object.new?
end

140
lib/couchrest/support/class.rb
View file

@ -1,4 +1,4 @@
# Copyright (c) 2004-2008 David Heinemeier Hansson
# Copyright (c) 2006-2009 David Heinemeier Hansson
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
@ -18,79 +18,59 @@
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Extracted From
# http://github.com/rails/rails/commit/971e2438d98326c994ec6d3ef8e37b7e868ed6e2
# Allows attributes to be shared within an inheritance hierarchy, but where
# each descendant gets a copy of their parents' attributes, instead of just a
# pointer to the same. This means that the child can add elements to, for
# example, an array without those additions being shared with either their
# parent, siblings, or children, which is unlike the regular class-level
# attributes that are shared across the entire hierarchy.
# Extends the class object with class and instance accessors for class attributes,
# just like the native attr* accessors for instance attributes.
#
# class Person
# cattr_accessor :hair_colors
# end
#
# Person.hair_colors = [:brown, :black, :blonde, :red]
class Class
# Defines class-level and instance-level attribute reader.
#
# @param *syms<Array> Array of attributes to define reader for.
# @return <Array[#to_s]> List of attributes that were made into cattr_readers
#
# @api public
#
# @todo Is this inconsistent in that it does not allow you to prevent
# an instance_reader via :instance_reader => false
def cattr_reader(*syms)
syms.flatten.each do |sym|
next if sym.is_a?(Hash)
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
unless defined? @@#{sym}
@@#{sym} = nil
end
def self.#{sym}
@@#{sym}
end
def #{sym}
@@#{sym}
end
RUBY
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
unless defined? @@#{sym} # unless defined? @@hair_colors
@@#{sym} = nil # @@hair_colors = nil
end # end
#
def self.#{sym} # def self.hair_colors
@@#{sym} # @@hair_colors
end # end
#
def #{sym} # def hair_colors
@@#{sym} # @@hair_colors
end # end
EOS
end
end unless Class.respond_to?(:cattr_reader)
# Defines class-level (and optionally instance-level) attribute writer.
#
# @param <Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to define writer for.
# @option syms :instance_writer<Boolean> if true, instance-level attribute writer is defined.
# @return <Array[#to_s]> List of attributes that were made into cattr_writers
#
# @api public
def cattr_writer(*syms)
options = syms.last.is_a?(Hash) ? syms.pop : {}
options = syms.extract_options!
syms.flatten.each do |sym|
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
unless defined? @@#{sym}
@@#{sym} = nil
end
def self.#{sym}=(obj)
@@#{sym} = obj
end
RUBY
unless options[:instance_writer] == false
class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
def #{sym}=(obj)
@@#{sym} = obj
end
RUBY
end
class_eval(<<-EOS, __FILE__, __LINE__ + 1)
unless defined? @@#{sym} # unless defined? @@hair_colors
@@#{sym} = nil # @@hair_colors = nil
end # end
#
def self.#{sym}=(obj) # def self.hair_colors=(obj)
@@#{sym} = obj # @@hair_colors = obj
end # end
#
#{" #
def #{sym}=(obj) # def hair_colors=(obj)
@@#{sym} = obj # @@hair_colors = obj
end # end
" unless options[:instance_writer] == false } # # instance writer above is generated unless options[:instance_writer] == false
EOS
end
end unless Class.respond_to?(:cattr_writer)
# Defines class-level (and optionally instance-level) attribute accessor.
#
# @param *syms<Array[*#to_s, Hash{:instance_writer => Boolean}]> Array of attributes to define accessor for.
# @option syms :instance_writer<Boolean> if true, instance-level attribute writer is defined.
# @return <Array[#to_s]> List of attributes that were made into accessors
#
# @api public
def cattr_accessor(*syms)
cattr_reader(*syms)
cattr_writer(*syms)
@ -156,6 +136,8 @@ class Class
def #{ivar}=(obj) self.class.#{ivar} = obj end
RUBY
end
self.send("#{ivar}=", yield) if block_given?
end
end unless Class.respond_to?(:extlib_inheritable_writer)
@ -168,9 +150,41 @@ class Class
# @return <Array[#to_s]> An Array of attributes turned into inheritable accessors.
#
# @api public
def extlib_inheritable_accessor(*syms)
def extlib_inheritable_accessor(*syms, &block)
extlib_inheritable_reader(*syms)
extlib_inheritable_writer(*syms)
extlib_inheritable_writer(*syms, &block)
end unless Class.respond_to?(:extlib_inheritable_accessor)
end
class Array
# Extracts options from a set of arguments. Removes and returns the last
# element in the array if it's a hash, otherwise returns a blank hash.
#
# def options(*args)
# args.extract_options!
# end
#
# options(1, 2) # => {}
# options(1, 2, :a => :b) # => {:a=>:b}
def extract_options!
last.is_a?(::Hash) ? pop : {}
end unless Array.new.respond_to?(:extract_options!)
# Wraps the object in an Array unless it's an Array. Converts the
# object to an Array using #to_ary if it implements that.
def self.wrap(object)
case object
when nil
[]
when self
object
else
if object.respond_to?(:to_ary)
object.to_ary
else
[object]
end
end
end unless Array.respond_to?(:wrap)
end

4
spec/couchrest/more/casted_model_spec.rb
View file

@ -35,10 +35,10 @@ class WithCastedCallBackModel < Hash
property :run_before_validate
property :run_after_validate
validate_callback :before do |object|
before_validate do |object|
object.run_before_validate = true
end
validate_callback :after do |object|
after_validate do |object|
object.run_after_validate = true
end
end

63
spec/couchrest/more/extended_doc_spec.rb
View file

@ -30,30 +30,56 @@ describe "ExtendedDocument" do
property :run_before_update
property :run_after_update
validate_callback :before do |object|
before_validate do |object|
object.run_before_validate = true
end
validate_callback :after do |object|
after_validate do |object|
object.run_after_validate = true
end
save_callback :before do |object|
before_save do |object|
object.run_before_save = true
end
save_callback :after do |object|
after_save do |object|
object.run_after_save = true
end
create_callback :before do |object|
before_create do |object|
object.run_before_create = true
end
create_callback :after do |object|
after_create do |object|
object.run_after_create = true
end
update_callback :before do |object|
before_update do |object|
object.run_before_update = true
end
update_callback :after do |object|
after_update do |object|
object.run_after_update = true
end
property :run_one
property :run_two
property :run_three
before_save :run_one_method, :run_two_method do |object|
object.run_three = true
end
def run_one_method
self.run_one = true
end
def run_two_method
self.run_two = true
end
attr_accessor :run_it
property :conditional_one
property :conditional_two
before_save :conditional_one_method, :conditional_two_method, :if => proc { self.run_it }
def conditional_one_method
self.conditional_one = true
end
def conditional_two_method
self.conditional_two = true
end
end
class WithTemplateAndUniqueID < CouchRest::ExtendedDocument
@ -552,6 +578,27 @@ describe "ExtendedDocument" do
@doc.save.should be_true
@doc.run_after_save.should be_true
end
it "should run the grouped callbacks before saving" do
@doc.run_one.should be_nil
@doc.run_two.should be_nil
@doc.run_three.should be_nil
@doc.save.should be_true
@doc.run_one.should be_true
@doc.run_two.should be_true
@doc.run_three.should be_true
end
it "should not run conditional callbacks" do
@doc.run_it = false
@doc.save.should be_true
@doc.conditional_one.should be_nil
@doc.conditional_two.should be_nil
end
it "should run conditional callbacks" do
@doc.run_it = true
@doc.save.should be_true
@doc.conditional_one.should be_true
@doc.conditional_two.should be_true
end
end
describe "create" do
it "should run the before save filter when creating" do

2
spec/fixtures/more/article.rb vendored
View file

@ -26,7 +26,7 @@ class Article < CouchRest::ExtendedDocument
timestamps!
save_callback :before, :generate_slug_from_title
before_save :generate_slug_from_title
def generate_slug_from_title
self['slug'] = title.downcase.gsub(/[^a-z0-9]/,'-').squeeze('-').gsub(/^\-|\-$/,'') if new?