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• Mario T. Lanza commented  ·  February 4, 2011 11:58 a.m.  ·  Flag as inappropriateFlag as inappropriate  ·  Delete

  This is above all the greatest shortcoming to AR. It's almost a deal breaker and has me evaluating Sequel and other ORMs for an upcoming project. In one project I am working with highly intertwined database structures. The same records are frequently reloaded due to the way the business objects are navigated. Identity Map could solve this headache.

• gregd commented  ·  August 19, 2009 9:35 a.m.  ·  Flag as inappropriateFlag as inappropriate  ·  Delete

  class Parent
  has_many :children
  end

  class Child
  belongs_to :parent
  validate_presence_of :parent_id
  end

  Now above simple code fails if parent and child records are created via nested forms (Rails 2.3 feature). I hope that with identity map, child records could have a reference to the parent object which exists only in memory. So validations like above and other non-trivial code also works.

• Venkat K commented  ·  June 22, 2009 4:45 a.m.  ·  Flag as inappropriateFlag as inappropriate  ·  Delete

  I have AR objects which have parent child relationships (many are nested sets but even otherwise there are two or three level table relationships) this is becoming a important necessity

  Parental Kontrol could be one useful plugin to give some relieve onw

• Luismi Cavallé commented  ·  May 22, 2009 11:51 a.m.  ·  Flag as inappropriateFlag as inappropriate  ·  Delete

  I wasn't used to miss this functionality but lately I periodically get into advanced issues were i'd be really nice to have identity map in ActiveRecord. I also think some internals of ActiveRecord would be simplified and so further maintenance.

• Otto Hilska commented  ·  May 13, 2009 12:41 a.m.  ·  Flag as inappropriateFlag as inappropriate  ·  Delete

  Not having an identity map forces me to write ugly hacks to avoid the performance problems.