最近几天,我试图使用Redis商店缓存rails app.
我有两个型号：
我有两个型号：
class Category < ActiveRecord::Base
has_many :products
after_save :clear_redis_cache
private
def clear_redis_cache
puts "heelllooooo"
$redis.del 'products'
end
end
和
class Product < ActiveRecord::Base belongs_to :category,touch: true end
在控制器中
def index
@products = $redis.get('products')
if @products.nil?
@products = Product.joins(:category).pluck("products.id","products.name","categories.name")
$redis.set('products',@products)
$redis.expire('products',3.hour.to_i)
end
@products = JSON.load(@products) if @products.is_a?(String)
end
使用此代码,缓存工作正常.
但是当我更新或创建新产品(我在关系中使用了触摸方法)时,它不会触发Category模型中的after_save回调.
你能解释一下为什么吗？
解决方法
您是否阅读过
touch方法的文档？
Saves the record with the updated_at/on attributes set to the current
time. Please note that no validation is performed and only the after_touch,after_commit and after_rollback callbacks are executed. If an attribute name is passed,that attribute is updated along with updated_at/on attributes.