is latest a method ?

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PC Leung

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Nov 12, 2013, 10:33:01 AM11/12/13
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according to the book 'Agile web dev.." page 125
I am using rails 4.0 and hit the following error.
Is latest a method or not?
Thanks


undefined method `latest' for #<Class:0x007fca86206d88>

Extracted source (around line #7):

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<h1>Your Pragmatic Catalog</h1>
<% cache ['store', Product.latest] do %>
<% @products.each do |product| %>
<% cache ['entry', product] do %>
<div class="entry">

Matthew Rudy Jacobs

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Nov 12, 2013, 10:41:28 AM11/12/13
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I don't have a copy of the book,
but you should probably just say `Product.last`.

The idea is to cache the products so that it gets expired when products change.

So actually Product.lastest could be defined

def Product.latest
  Product.order("updated_at DESC").first
end


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Dustin

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Nov 12, 2013, 10:43:48 AM11/12/13
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You know what Russian doll caching is, but Model.latest trips you up. Search either resource:


And



Steve Holmes

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Nov 12, 2013, 7:52:07 PM11/12/13
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Yup

PC, look at page 118 in the PDF (or printed page 104)

That method should be defined in your product model.

Graham Milosevic

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Nov 12, 2013, 9:16:43 PM11/12/13
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I'm not sure what's on page 104, but it could be a scope instead of a method which is what I would have done.
Graham Milosevic
Phone: 6770-8171

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PC Leung

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Nov 13, 2013, 4:20:20 AM11/13/13
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thanks everybody. I find it.

config.action_controller.perform_caching = true

def self.latest 

  Product.order(:updated_at).last

end 

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