Question

我有一个周期性的视图，其中select标签的数据不经常变化但是很昂贵，所以我想实现缓存，它适用于一些选择，但不要知道如何使用grouped_collection_select。

这是我想要缓存的代码（抱歉西班牙语的变化）：

模型代码：

def self.cached_campuses
  Rails.cache.fetch([self, "campuses"]) do
    Campus.active.order(:name)
  end
end

def self.cached_programas
  Rails.cache.fetch([self, "programas"]) do
    Programa.considered.active.order(:name).map{ |programa| [programa.name, programa.id, {'data-campus'=>programa.campus.id, 'data-nivel'=>programa.nivel.clave}] }
  end
end
#there are more but of the same style

控制器：

@campus = Campus.cached_campuses
@programas = Programa.cached_programas
# some others

查看：

= simple_form_for @user do |f|
  # This reads from cache everything
  = f.input :campus_id, collection: @campus, ...

  # This one doesn't read all from cache, makes queries to the table Nivel cause the grouped_collection
  = f.grouped_collection_select :nivel_id, @campus, :niveles, ...

  # This reads from cache everything
  = f.select :programa_id, options_for_select( @programas )
  # some other selects

我需要select with grouped_collection，因为在View中它会通过javascript过滤，具体取决于用户在顶部选择中选择的选项。

如何在模型内部缓存Nivel groups_collection_select的数据？

Answer 1

找到它，

而不是groups_collection_select，在Helper中我做了：

def cached_niveles
  unless Rails.cache.exist?( "select_niveles" )
    Rails.cache.write( "select_niveles", option_groups_from_collection_for_select(Campus.cached_campuses, :niveles, :id, :clave, :nombre) )
  end

  Rails.cache.read( "select_niveles")
end

形式：

= select_tag 'usuario[nivel_id]', cached_niveles, prompt: "NIVEL DE INTERÉS"

诀窍是使用option_groups_from_collection_for_select

Rails 3 - 使用缓存进行表单视图帮助程序grouped_collection_select

1 个答案: