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Started working on casted models, basic functionalities are now in.

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property :casted_attribute, :cast_as => 'WithCastedModelMixin'

A casted attribute now knows about its parent. (#casted_by to retrieve the parent's object)
This commit is contained in:
Matt Aimonetti 2009-02-09 11:20:23 -08:00
parent fa7b176fce
commit 621f5565e9
10 changed files with 177 additions and 40 deletions
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18
lib/couchrest.rb
View file

@ -39,6 +39,7 @@ module CouchRest
autoload :Streamer, 'couchrest/helper/streamer'
autoload :ExtendedDocument, 'couchrest/more/extended_document'
autoload :CastedModel, 'couchrest/more/casted_model'
require File.join(File.dirname(__FILE__), 'couchrest', 'mixins')
@ -47,6 +48,23 @@ module CouchRest
# some helpers for tasks like instantiating a new Database or Server instance.
class << self
# extracted from Extlib
#
# Constantize tries to find a declared constant with the name specified
# in the string. It raises a NameError when the name is not in CamelCase
# or is not initialized.
#
# @example
# "Module".constantize #=> Module
# "Class".constantize #=> Class
def constantize(camel_cased_word)
unless /\A(?:::)?([A-Z]\w*(?:::[A-Z]\w*)*)\z/ =~ camel_cased_word
raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!"
end
Object.module_eval("::#{$1}", __FILE__, __LINE__)
end
# todo, make this parse the url and instantiate a Server or Database instance
# depending on the specificity.
def new(*opts)

66
lib/couchrest/mixins/properties.rb
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@ -1,18 +1,24 @@
require File.join(File.dirname(__FILE__), '..', 'more', 'property')
module CouchRest
module Mixins
module DocumentProperties
module Properties
class IncludeError < StandardError; end
def self.included(base)
base.cattr_accessor(:properties)
base.class_eval <<-EOS, __FILE__, __LINE__
@@properties = []
EOS
base.extend(ClassMethods)
raise CouchRest::Mixins::DocumentProporties::InludeError, "You can only mixin Properties in a class responding to [] and []=" unless (base.new.respond_to?(:[]) && base.new.respond_to?(:[]=))
raise CouchRest::Mixins::Properties::IncludeError, "You can only mixin Properties in a class responding to [] and []=, if you tried to mixin CastedModel, make sure your class inherits from Hash or responds to the proper methods" unless (base.new.respond_to?(:[]) && base.new.respond_to?(:[]=))
end
def apply_defaults
return unless new_document?
return unless self.respond_to?(:new_document?) && new_document?
return unless self.class.respond_to?(:properties)
return if self.class.properties.empty?
# TODO: cache the default object
self.class.properties.each do |property|
key = property.name.to_s
@ -25,16 +31,38 @@ module CouchRest
end
end
end
end
def cast_keys
return unless self.class.properties
# TODO move the argument checking to the cast method for early crashes
self.class.properties.each do |property|
next unless property.casted
key = self.has_key?(property.name) ? property.name : property.name.to_sym
target = property.type
if target.is_a?(Array)
klass = ::CouchRest.constantize(target[0])
self[property.name] = self[key].collect do |value|
obj = ( (property.init_method == 'send') && klass == Time) ? Time.parse(value) : klass.send(property.init_method, value)
obj.casted_by = self if obj.respond_to?(:casted_by)
obj
end
else
# Let people use :send as a Time parse arg
self[property.name] = if ((property.init_method != 'send') && target == 'Time')
Time.parse(self[property.init_method])
else
klass = ::CouchRest.constantize(target)
klass.send(property.init_method, self[property.name])
end
self[key].casted_by = self if self[key].respond_to?(:casted_by)
end
end
end
module ClassMethods
# Stores the class properties
def properties
@@properties ||= []
end
def property(name, options={})
define_property(name, options) unless properties.map{|p| p.name}.include?(name.to_s)
end
@ -44,29 +72,31 @@ module CouchRest
# This is not a thread safe operation, if you have to set new properties at runtime
# make sure to use a mutex.
def define_property(name, options={})
property = CouchRest::Property.new(name, options.delete(:type), options)
# check if this property is going to casted
options[:casted] = true if options[:cast_as]
property = CouchRest::Property.new(name, (options.delete(:cast_as) || options.delete(:type)), options)
create_property_getter(property)
create_property_setter(property) unless property.read_only == true
properties << property
end
# defines the getter for the property
# defines the getter for the property (and optional aliases)
def create_property_getter(property)
meth = property.name
class_eval <<-EOS
def #{meth}
self['#{meth}']
# meth = property.name
class_eval <<-EOS, __FILE__, __LINE__
def #{property.name}
self['#{property.name}']
end
EOS
if property.alias
class_eval <<-EOS
alias #{property.alias.to_sym} #{meth.to_sym}
class_eval <<-EOS, __FILE__, __LINE__
alias #{property.alias.to_sym} #{property.name.to_sym}
EOS
end
end
# defines the setter for the property
# defines the setter for the property (and optional aliases)
def create_property_setter(property)
meth = property.name
class_eval <<-EOS

5
lib/couchrest/mixins/validation.rb
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@ -126,10 +126,7 @@ module CouchRest
self.respond_to?(name, true) ? self.send(name) : nil
end
# Get the corresponding Resource property, if it exists.
#
# Note: CouchRest validations can be used on non-CouchRest resources.
# In such cases, the return value will be nil.
# Get the corresponding Object property, if it exists.
def validation_property(field_name)
properties.find{|p| p.name == field_name}
end

28
lib/couchrest/more/casted_model.rb Normal file
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@ -0,0 +1,28 @@
require File.join(File.dirname(__FILE__), '..', 'mixins', 'properties')
module CouchRest
module CastedModel
def self.included(base)
base.send(:include, CouchRest::Mixins::Properties)
base.send(:attr_accessor, :casted_by)
end
def initialize(keys={})
super
keys.each do |k,v|
self[k.to_s] = v
end if keys
apply_defaults # defined in CouchRest::Mixins::Properties
# cast_keys # defined in CouchRest::Mixins::Properties
end
def []= key, value
super(key.to_s, value)
end
def [] key
super(key.to_s)
end
end
end

6
lib/couchrest/more/extended_document.rb
View file

@ -15,7 +15,7 @@ module CouchRest
class ExtendedDocument < Document
include CouchRest::Callbacks
include CouchRest::Mixins::DocumentQueries
include CouchRest::Mixins::DocumentProperties
include CouchRest::Mixins::Properties
include CouchRest::Mixins::Views
include CouchRest::Mixins::DesignDoc
@ -25,8 +25,8 @@ module CouchRest
def initialize(keys={})
super
apply_defaults # defined in CouchRest::Mixins::DocumentProperties
# cast_keys
apply_defaults # defined in CouchRest::Mixins::Properties
cast_keys # defined in CouchRest::Mixins::Properties
unless self['_id'] && self['_rev']
self['couchrest-type'] = self.class.to_s
end

6
lib/couchrest/more/property.rb
View file

@ -2,12 +2,12 @@ module CouchRest
# Basic attribute support for adding getter/setter + validation
class Property
attr_reader :name, :type, :read_only, :alias, :default, :options
attr_reader :name, :type, :read_only, :alias, :default, :casted, :init_method, :options
# attribute to define
def initialize(name, type = nil, options = {})
@name = name.to_s
@type = type || String
@type = type.nil? ? 'String' : type.to_s
parse_options(options)
self
end
@ -20,6 +20,8 @@ module CouchRest
@read_only = options.delete(:read_only) if options[:read_only]
@alias = options.delete(:alias) if options[:alias]
@default = options.delete(:default) if options[:default]
@casted = options[:casted] ? true : false
@init_method = options[:send] ? options.delete[:send] : 'new'
@options = options
end

4
lib/couchrest/validation/auto_validate.rb
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@ -107,7 +107,7 @@ module CouchRest
end
# length
if property.type == String
if property.type == "String"
# XXX: maybe length should always return a Range, with the min defaulting to 1
# 52 being the max set
len = property.options.fetch(:length, property.options.fetch(:size, 52))
@ -145,7 +145,7 @@ module CouchRest
end
# numeric validator
if Integer == property.type
if "Integer" == property.type
opts[:integer_only] = true
# validates_is_number property.name, opts
validates_is_number property.name, options_with_message(opts, property, :is_number)

60
spec/couchrest/more/casted_model_spec.rb Normal file
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@ -0,0 +1,60 @@
require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
require File.join(FIXTURE_PATH, 'more', 'card')
describe CouchRest::CastedModel do
class WithCastedModelMixin < Hash
include CouchRest::CastedModel
property :name
end
class DummyModel < CouchRest::ExtendedDocument
property :casted_attribute, :cast_as => 'WithCastedModelMixin'
end
describe "A non hash class including CastedModel" do
it "should fail raising and include error" do
lambda do
class NotAHashButWithCastedModelMixin
include CouchRest::CastedModel
property :name
end
end.should raise_error
end
end
describe "isolated" do
before(:each) do
@obj = WithCastedModelMixin.new
end
it "should automatically include the property mixin and define getters and setters" do
@obj.name = 'Matt'
@obj.name.should == 'Matt'
end
end
describe "casted as attribute" do
before(:each) do
@obj = DummyModel.new(:casted_attribute => {:name => 'whatever'})
@casted_obj = @obj.casted_attribute
end
it "should be available from its parent" do
@casted_obj.should be_an_instance_of(WithCastedModelMixin)
end
it "should have the getters defined" do
@casted_obj.name.should == 'whatever'
end
it "should know who casted it" do
@casted_obj.casted_by.should == @obj
end
end
end

5
spec/couchrest/more/extended_doc_spec.rb
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@ -1,10 +1,5 @@
require File.dirname(__FILE__) + '/../../spec_helper'
# require File.join(FIXTURE_PATH, 'more', 'card')
# require File.join(FIXTURE_PATH, 'more', 'invoice')
# require File.join(FIXTURE_PATH, 'more', 'service')
class WithDefaultValues < CouchRest::ExtendedDocument
use_database TEST_SERVER.default_database
property :preset, :default => {:right => 10, :top_align => false}

11
spec/couchrest/more/property_spec.rb
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@ -1,7 +1,8 @@
require File.join(File.dirname(__FILE__), '..', '..', 'spec_helper')
require File.join(FIXTURE_PATH, 'more', 'card')
require File.join(FIXTURE_PATH, 'more', 'invoice')
require File.join(FIXTURE_PATH, 'more', 'service')
require File.join(FIXTURE_PATH, 'more', 'service.rb')
describe "ExtendedDocument properties" do
@ -36,7 +37,7 @@ describe "ExtendedDocument properties" do
it "should be auto timestamped" do
@card.created_at.should be_nil
@card.updated_at.should be_nil
# :emo:hack for autospec
# :emo: hack for autospec
Card.use_database(TEST_SERVER.default_database) if @card.database.nil?
@card.save
@card.created_at.should_not be_nil
@ -84,6 +85,7 @@ describe "ExtendedDocument properties" do
end
describe "autovalidation" do
before(:each) do
@service = Service.new(:name => "Coumpound analysis", :price => 3_000)
end
@ -92,7 +94,12 @@ describe "ExtendedDocument properties" do
@service.should be_valid
end
it "should not respond to properties not setup" do
@service.respond_to?(:client_name).should be_false
end
describe "property :name, :length => 4...20" do
it "should autovalidate the presence when length is set" do
@service.name = nil
@service.should_not be_valid