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module ActiveRecord
module IdentityMap
extend ActiveSupport::Concern
class << self
attr_accessor :repositories
attr_accessor :current_repository_name
attr_accessor :enabled
def current
repositories[current_repository_name] ||= Weakling::WeakHash.new
end
def with_repository(name = :default)
old_repository = self.current_repository_name
self.current_repository_name = name
yield if block_given?
ensure
self.current_repository_name = old_repository
end
def without
old, self.enabled = self.enabled, false
yield if block_given?
ensure
self.enabled = old
end
def get(class_name, primary_key)
current[[class_name, primary_key.to_s]]
end
def add(record)
current[[record.class.name, record.id.to_s]] = record
end
def remove(record)
current.delete([record.class.name, record.id.to_s])
end
def clear
current.clear
end
alias enabled? enabled
alias identity_map= enabled=
end
self.repositories ||= Hash.new
self.current_repository_name ||= :default
self.enabled = false
module InstanceMethods
# Reinitialize an Identity Map model object from +coder+.
# +coder+ must contain the attributes necessary for initializing an empty
# model object.
def reinit_with(coder)
@attributes_cache = {}
dirty = @changed_attributes.keys
@attributes.update(coder['attributes'].except(*dirty))
@changed_attributes.update(coder['attributes'].slice(*dirty))
@changed_attributes.delete_if{|k,v| v.eql? @attributes[k]}
_run_find_callbacks
self
end
end
module ClassMethods
def identity_map
ActiveRecord::IdentityMap
end
end
end
end
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