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Versions: 13
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Contents
module Toy
class Index
attr_accessor :model, :name
def initialize(model, name)
@model, @name = model, name.to_sym
raise(ArgumentError, "No attribute #{name} for index") unless model.attribute?(name)
model.indices[name] = self
model.send(:include, IndexCallbacks)
create_finders
end
def eql?(other)
self.class.eql?(other.class) &&
model == other.model &&
name == other.name
end
alias :== :eql?
def key(value)
sha_value = Digest::SHA1.hexdigest(Array.wrap(value).sort.join('')) # sorted for predictability
[model.name, name, sha_value].join(':')
end
module IndexCallbacks
extend ActiveSupport::Concern
included do
after_create :index_create
after_update :index_update
after_destroy :index_destroy
end
def index_create
indices.each_key do |name|
create_index(name, send(name), id)
end
end
def index_update
indices.each_key do |name|
if send(:"#{name}_changed?")
destroy_index(name, send(:"#{name}_was"), id)
create_index(name, send(name), id)
end
end
end
def index_destroy
indices.each_key do |name|
destroy_index(name, send(name), id)
end
end
end
private
def create_finders
model.class_eval """
def self.first_by_#{name}(value)
get(get_index(:#{name}, value)[0])
end
def self.first_or_new_by_#{name}(value)
first_by_#{name}(value) || new(:#{name} => value)
end
def self.first_or_create_by_#{name}(value)
first_by_#{name}(value) || create(:#{name} => value)
end
"""
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems