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object_daddy.rb
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object_daddy.rb
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module ObjectDaddy
def self.included(klass)
klass.extend ClassMethods
if defined? ActiveRecord and klass < ActiveRecord::Base
klass.extend RailsClassMethods
class << klass
alias_method :validates_presence_of_without_object_daddy, :validates_presence_of
alias_method :validates_presence_of, :validates_presence_of_with_object_daddy
alias_method :validates_without_object_daddy, :validates
alias_method :validates, :validates_with_object_daddy
end
end
end
module ClassMethods
attr_accessor :exemplars_generated, :exemplar_path, :generators
attr_reader :presence_validated_attributes
protected :exemplars_generated=
# :call-seq:
# spawn()
# spawn() do |obj| ... end
# spawn(args)
# spawn(args) do |obj| ... end
#
# Creates a valid instance of this class, using any known generators. The
# generated instance is yielded to a block if provided.
def spawn(args = {})
gather_exemplars
if @concrete_subclass_name
return block_given? \
? const_get(@concrete_subclass_name).spawn(args) {|instance| yield instance} \
: const_get(@concrete_subclass_name).spawn(args)
end
generate_values(args)
instance = new
args.each_pair do |attribute, value|
instance.send("#{attribute}=", value) # support setting of mass-assignment protected attributes
end
yield instance if block_given?
instance
end
# register a generator for an attribute of this class
# generator_for :foo do |prev| ... end
# generator_for :foo do ... end
# generator_for :foo, value
# generator_for :foo => value
# generator_for :foo, :class => GeneratorClass
# generator_for :foo, :method => :method_name
def generator_for(handle, args = {}, &block)
if handle.is_a?(Hash)
raise ArgumentError, "only specify one attr => value pair at a time" unless handle.keys.length == 1
gen_data = handle
handle = gen_data.keys.first
args = gen_data[handle]
end
raise ArgumentError, "an attribute name must be specified" unless handle = handle.to_sym
unless args.is_a?(Hash)
unless block
retval = args
block = lambda { retval } # lambda { args } results in returning the empty hash that args gets changed to
end
args = {} # args is assumed to be a hash for the rest of the method
end
if args[:start]
block ||= lambda { |prev| prev.succ }
end
if args[:method]
h = { :method => args[:method].to_sym }
h[:start] = args[:start] if args[:start]
record_generator_for(handle, h)
elsif args[:class]
raise ArgumentError, "generator class [#{args[:class].name}] does not have a :next method" unless args[:class].respond_to?(:next)
record_generator_for(handle, :class => args[:class])
elsif block
raise ArgumentError, "generator block must take an optional single argument" unless (-1..1).include?(block.arity) # NOTE: lambda {} has an arity of -1, while lambda {||} has an arity of 0
h = { :block => block }
h[:start] = args[:start] if args[:start]
record_generator_for(handle, h)
else
raise ArgumentError, "a block, :class generator, :method generator, or value must be specified to generator_for"
end
end
def generates_subclass(subclass_name)
@concrete_subclass_name = subclass_name.to_s
end
def gather_exemplars
return if exemplars_generated
self.generators ||= {}
if superclass.respond_to?(:gather_exemplars)
superclass.gather_exemplars
self.generators = (superclass.generators).merge(generators).dup
end
exemplar_path.each do |raw_path|
path = File.join(raw_path, "#{underscore(name)}_exemplar.rb")
load(path) if File.exists?(path)
end
self.exemplars_generated = true
end
def presence_validated_attributes
@presence_validated_attributes ||= {}
attrs = @presence_validated_attributes
if superclass.respond_to?(:presence_validated_attributes)
attrs = superclass.presence_validated_attributes.merge(attrs)
end
attrs
end
protected
# we define an underscore helper ourselves since the ActiveSupport isn't available if we're not using Rails
def underscore(string)
string.gsub(/([a-z])([A-Z])/, '\1_\2').downcase
end
def record_generator_for(handle, generator)
self.generators ||= {}
raise ArgumentError, "a generator for attribute [:#{handle}] has already been specified" if (generators[handle] || {})[:source] == self
generators[handle] = { :generator => generator, :source => self }
end
private
def generate_values(args)
(generators || {}).each_pair do |handle, gen_data|
next if args.include?(handle) or args.include?(handle.to_s)
generator = gen_data[:generator]
if generator[:block]
process_generated_value(args, handle, generator, generator[:block])
elsif generator[:method]
method = method(generator[:method])
if method.arity == 1
process_generated_value(args, handle, generator, method)
else
args[handle] = method.call
end
elsif generator[:class]
args[handle] = generator[:class].next
end
end
generate_missing(args)
end
def process_generated_value(args, handle, generator, block)
if generator[:start]
value = generator[:start]
generator.delete(:start)
else
if block.arity == 0
value = block.call
else
value = block.call(generator[:prev])
end
end
generator[:prev] = args[handle] = value
end
def generate_missing(args)
if presence_validated_attributes and !presence_validated_attributes.empty?
req = {}
(presence_validated_attributes.keys - args.keys).each {|a| req[a.to_s] = true } # find attributes required by validates_presence_of not already set
belongs_to_associations = reflect_on_all_associations(:belongs_to).to_a
fk_method = Rails.version >= "3.1.0" ? :foreign_key : :primary_key_name
missing = belongs_to_associations.select { |a| req[a.name.to_s] or req[a.send(fk_method).to_s] }
# Rails 3.1 compatibility jazz - current_scoped_methods was deprecated.
if scope = respond_to?(:current_scoped_methods) ? current_scoped_methods : current_scope
missing.reject! { |a| scope.scope_for_create.include?(a.send(fk_method)) }
end
missing.reject! { |a| [a.name, a.send(fk_method)].any? { |n| args.stringify_keys.include?(n.to_s) } }
missing.each {|a| args[a.name] = a.class_name.constantize.generate }
end
end
end
module RailsClassMethods
def exemplar_path
paths = ['spec', 'test'].inject([]) do |array, dir|
if File.directory?(File.join(Rails.root, dir))
array << File.join(Rails.root, dir, 'exemplars')
end
array
end
end
def validates_presence_of_with_object_daddy(*attr_names)
@presence_validated_attributes ||= {}
new_attr = attr_names.dup
new_attr.pop if new_attr.last.is_a?(Hash)
new_attr.each {|a| @presence_validated_attributes[a] = true }
validates_presence_of_without_object_daddy(*attr_names)
end
def validates_with_object_daddy(*args)
if args.last.is_a?(Hash) && args.last[:presence]
@presence_validated_attributes ||= {}
@presence_validated_attributes[args.first] = true
end
validates_without_object_daddy(*args)
end
# :call-seq:
# generate()
# generate() do |obj| ... end
# generate(args)
# generate(args) do |obj| ... end
#
# Creates and tries to save an instance of this class, using any known
# generators. The generated instance is yielded to a block if provided.
#
# This will not raise errors on a failed save. Use generate! if you
# want errors raised.
def generate(args = {})
spawn(args) do |instance|
instance.save
yield instance if block_given?
end
end
# :call-seq:
# generate()
# generate() do |obj| ... end
# generate(args)
# generate(args) do |obj| ... end
#
# Creates and tries to save! an instance of this class, using any known
# generators. The generated instance is yielded to a block if provided.
#
# This will raise errors on a failed save. Use generate if you do not want
# errors raised.
def generate!(args = {})
spawn(args) do |instance|
instance.save!
yield instance if block_given?
end
end
end
end
unless ActiveRecord::Base.respond_to? :inherited_with_object_daddy
class ActiveRecord::Base
def self.inherited_with_object_daddy(subclass)
self.inherited_without_object_daddy(subclass)
subclass.send(:include, ObjectDaddy) unless subclass < ObjectDaddy
end
class << self
alias_method_chain :inherited, :object_daddy
end
end
end