ruby on rails - Complex ActiveRecord association definition -

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How do you map the dashed union using the ActiveCard? Is there any active record to do this? All I want is to get all unique available promotions for a particular item.

<

Use of Custom Finder 

  class items & lt; / P> 
 ActiveRecord :: Base has_many: promotions,: finder_sql = & gt; "SELECT..FROM promotions..purchase_option_id IN (...)" end

Dirty and inactive but rummy way 

  My_item.purchase_options.map (& amp ;: Promotion).

Breaking the Shopping Option Promotion The HABT Association and items & lt; -> Promoted Purchase Option 

  class items & lt; ActiveRecord :: Base is - Medium: promoted_purchase_options is _ many: promotions, via = & gt; I do not think it's a good idea to use  designated scope
em> or new methods to define it would only will not work or perform queries unable to use them: 

  items. Prior. Promotion count items. First. Publicity. Available Promotion.first.items.all

Perhaps it:

< Pre> class items & lt; ActiveRecord :: Base is _Maya: Purchase_Action is_mind: promotion, via = & gt; : Purchase_Options: UNIC = & gt; True end

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