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require "active_support/core_ext/class/attribute"
require "active_support/core_ext/string/inflections"
require "active_support/core_ext/module/anonymous"
require "set"
module ActiveModel
class Serializer
module Associations
class Config < Struct.new(:name, :options)
def serializer
options[:serializer]
end
end
class HasMany < Config
def serialize(collection, scope)
collection.map do |item|
serializer.new(item, scope).serializable_hash
end
end
def serialize_ids(collection, scope)
# use named scopes if they are present
return collection.ids if collection.respond_to?(:ids)
collection.map do |item|
item.read_attribute_for_serialization(:id)
end
end
end
class HasOne < Config
def serialize(object, scope)
serializer.new(object, scope).serializable_hash
end
def serialize_ids(object, scope)
object.read_attribute_for_serialization(:id)
end
end
end
class_attribute :_attributes
self._attributes = Set.new
class_attribute :_associations
self._associations = []
class << self
def attributes(*attrs)
self._attributes += attrs
end
def associate(klass, attrs)
options = attrs.extract_options!
self._associations += attrs.map do |attr|
unless method_defined?(attr)
class_eval "def #{attr}() object.#{attr} end", __FILE__, __LINE__
end
options[:serializer] ||= const_get("#{attr.to_s.camelize}Serializer")
klass.new(attr, options)
end
end
def has_many(*attrs)
associate(Associations::HasMany, attrs)
end
def has_one(*attrs)
associate(Associations::HasOne, attrs)
end
def inherited(klass)
return if klass.anonymous?
name = klass.name.demodulize.underscore.sub(/_serializer$/, '')
klass.class_eval do
alias_method name.to_sym, :object
end
end
end
attr_reader :object, :scope
def initialize(object, scope)
@object, @scope = object, scope
end
def as_json(*)
serializable_hash
end
def serializable_hash
attributes.merge(associations)
end
def associations
hash = {}
_associations.each do |association|
associated_object = send(association.name)
hash[association.name] = association.serialize(associated_object, scope)
end
hash
end
def association_ids
hash = {}
_associations.each do |association|
associated_object = send(association.name)
hash[association.name] = association.serialize_ids(associated_object, scope)
end
hash
end
def attributes
hash = {}
_attributes.each do |name|
hash[name] = @object.read_attribute_for_serialization(name)
end
hash
end
end
end
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