php - Why Aren't the _construct() Methods on EAV Resources and Collections Declared as Abstract Methods? -

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I'm poking around the intestines of the Magento system code. For "regular" model resources, Magento's _construct initialization conference has been declared an intangible 

  file: grain / core / model / resource / abstract.fof abstract Protected function _ composition (); This makes sense, because it compels developers to create their own model resources, which is necessary to call the composition, which makes the necessary initialization.  
 However, the same conference / requirement exists for EAV model resources and their collections, but the  _construct  method  not  in those hierarchies is any Do you know the logic behind this? In such cases, do you need the  _construct  method on these models? Or is it a historical backward compatibility thing?

It has been left for backward compatibility issues;)

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