Module: ModelCached::ClassMethods

Defined in:
lib/model_cached.rb

Instance Method Summary collapse

Instance Method Details

#cache_by(*column_names) ⇒ Object 



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# File 'lib/model_cached.rb', line 7

def cache_by(*column_names)
  options = {logical_delete: nil, scope: nil}.merge(column_names.extract_options!)
  options[:columns] = column_names
  after_save :refresh_mc_keys
  after_touch :refresh_mc_keys
  after_destroy :expire_mc_keys
  class_eval %{ def self.mc_options; #{options}; end }
  column_names.each do |column|
    class_eval %{ def self.find_by_#{column}(value); find_cached_by(#{column.to_s.inspect}, value); end }
  end
  if column_names.include?(:id)
    class_eval do
      def self.find(*args)
        if args.size == 1 and (id = args.first).is_a?(Integer)
          find_by_id(id) || raise(ActiveRecord::RecordNotFound, "Couldn't find #{name} with ID=#{id}")
        else
          super(*args)
        end
      end
    end
  end
  include ModelCached::InstanceMethods
end

#find_cached_by(column, value) ⇒ Object 



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# File 'lib/model_cached.rb', line 31

def find_cached_by(column, value)
  if mc_options[:scope] and mc_scope_key.nil?
    where(column => value).first
  else
    Rails.cache.fetch(mc_key(column, value)) { where(column => value).first }
  end
end

#mc_key(column, value, scope_key = nil) ⇒ Object 



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# File 'lib/model_cached.rb', line 43

def mc_key(column, value, scope_key=nil)
  [column, value, scope_key || mc_scope_key].unshift(self.name.tableize).compact.join('/').gsub(/\s+/, '+')
end

#mc_scope_key ⇒ Object 



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# File 'lib/model_cached.rb', line 39

def mc_scope_key
  self.new().mc_scope_key
end