/
keys.rb
331 lines (268 loc) · 8.44 KB
/
keys.rb
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module MongoMapper
module Plugins
module Keys
def self.configure(model)
model.key :_id, ObjectId
end
module ClassMethods
def inherited(descendant)
descendant.instance_variable_set(:@keys, keys.dup)
super
end
def keys
@keys ||= HashWithIndifferentAccess.new
end
def key(*args)
key = Key.new(*args)
keys[key.name] = key
create_accessors_for(key)
create_key_in_descendants(*args)
create_indexes_for(key)
create_validations_for(key)
key
end
def using_object_id?
object_id_key?(:_id)
end
def object_id_key?(name)
key = keys[name.to_s]
key && key.type == ObjectId
end
def to_mongo(instance)
return nil if instance.nil?
instance.to_mongo
end
def from_mongo(value)
return nil if value.nil?
value.is_a?(self) ? value : load(value)
end
# load is overridden in identity map to ensure same objects are loaded
def load(attrs)
begin
klass = attrs['_type'].present? ? attrs['_type'].constantize : self
klass.new(attrs, true)
rescue NameError
new(attrs, true)
end
end
private
def accessors_module
module_defined = if method(:const_defined?).arity == 1 # Ruby 1.9 compat check
const_defined?('MongoMapperKeys')
else
const_defined?('MongoMapperKeys', false)
end
if module_defined
const_get 'MongoMapperKeys'
else
const_set 'MongoMapperKeys', Module.new
end
end
def create_accessors_for(key)
accessors_module.module_eval <<-end_eval
def #{key.name}
read_key(:#{key.name})
end
def #{key.name}_before_typecast
read_key_before_typecast(:#{key.name})
end
def #{key.name}=(value)
write_key(:#{key.name}, value)
end
def #{key.name}?
read_key(:#{key.name}).present?
end
end_eval
include accessors_module
end
def create_key_in_descendants(*args)
return if descendants.blank?
descendants.each { |descendant| descendant.key(*args) }
end
def create_indexes_for(key)
ensure_index key.name if key.options[:index] && !key.embeddable?
end
def create_validations_for(key)
attribute = key.name.to_sym
if key.options[:required]
validates_presence_of(attribute)
end
if key.options[:unique]
validates_uniqueness_of(attribute)
end
if key.options[:numeric]
number_options = key.type == Integer ? {:only_integer => true} : {}
validates_numericality_of(attribute, number_options)
end
if key.options[:format]
validates_format_of(attribute, :with => key.options[:format])
end
if key.options[:in]
validates_inclusion_of(attribute, :within => key.options[:in])
end
if key.options[:not_in]
validates_exclusion_of(attribute, :within => key.options[:not_in])
end
if key.options[:length]
length_options = case key.options[:length]
when Integer
{:minimum => 0, :maximum => key.options[:length]}
when Range
{:within => key.options[:length]}
when Hash
key.options[:length]
end
validates_length_of(attribute, length_options)
end
end
end
module InstanceMethods
def initialize(attrs={}, from_database=false)
unless attrs.nil?
provided_keys = attrs.keys.map { |k| k.to_s }
unless provided_keys.include?('_id') || provided_keys.include?('id')
write_key :_id, Mongo::ObjectID.new
end
end
assign_type_if_present
if from_database
@new = false
self.attributes = attrs
else
@new = true
assign(attrs)
end
end
def new?
@new
end
def attributes=(attrs)
return if attrs.blank?
attrs.each_pair do |name, value|
writer_method = "#{name}="
if respond_to?(writer_method)
if writer_method == '_root_document='
puts "_root_document= #{value.inspect}"
end
self.send(writer_method, value)
else
self[name.to_s] = value
end
end
end
def attributes
attrs = HashWithIndifferentAccess.new
keys.each_pair do |name, key|
value = key.set(self[key.name])
attrs[name] = value
end
embedded_associations.each do |association|
if documents = instance_variable_get(association.ivar)
attrs[association.name] = documents.map { |document| document.to_mongo }
end
end
attrs
end
alias :to_mongo :attributes
def assign(attrs={})
self.attributes = attrs
end
def update_attributes(attrs={})
assign(attrs)
save
end
def update_attributes!(attrs={})
assign(attrs)
save!
end
def id
_id
end
def id=(value)
if self.class.using_object_id?
value = MongoMapper.normalize_object_id(value)
end
self[:_id] = value
end
def [](name)
read_key(name)
end
def []=(name, value)
ensure_key_exists(name)
write_key(name, value)
end
# @api public
def keys
self.class.keys
end
# @api private?
def key_names
keys.keys
end
# @api private?
def non_embedded_keys
keys.values.select { |key| !key.embeddable? }
end
# @api private?
def embedded_keys
keys.values.select { |key| key.embeddable? }
end
private
def assign_type_if_present
self._type = self.class.name if respond_to?(:_type=)
end
def ensure_key_exists(name)
self.class.key(name) unless respond_to?("#{name}=")
end
def read_key(name)
if key = keys[name]
var_name = "@#{name}"
value = key.get(instance_variable_get(var_name))
instance_variable_set(var_name, value)
else
raise KeyNotFound, "Could not find key: #{name.inspect}"
end
end
def read_key_before_typecast(name)
instance_variable_get("@#{name}_before_typecast")
end
def write_key(name, value)
key = keys[name]
instance_variable_set "@#{name}_before_typecast", value
instance_variable_set "@#{name}", key.set(value)
end
end
class Key
attr_accessor :name, :type, :options, :default_value
def initialize(*args)
options = args.extract_options!
@name, @type = args.shift.to_s, args.shift
self.options = (options || {}).symbolize_keys
self.default_value = self.options.delete(:default)
end
def ==(other)
@name == other.name && @type == other.type
end
def embeddable?
type.respond_to?(:embeddable?) && type.embeddable? ? true : false
end
def number?
[Integer, Float].include?(type)
end
def get(value)
if value.nil? && !default_value.nil?
if default_value.respond_to?(:call)
return default_value.call
else
return default_value
end
end
type.from_mongo(value)
end
def set(value)
type.to_mongo(value)
end
end
end
end
end