Active Record II


  • Scope
  • Locking 
  • Calculations 
  • Callback methods


What is Scope? 

  • Scoping allows you to specify commonly-used queries which can be referenced as method calls on models or association objects 
    • With these scopes, you can use every method previously covered such as where, joins and includes 
    • All scope methods will return an ActiveRecord::Relation object which will allow for chaining further methods (such as other scopes)

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