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Model Reflection Overview

We all use ActiveRecord Reflection on the fly while programming, since we declare all the relations in the model and we are considering it as obvious.
i tried to search and see if there is a way to find those reflections and to alter it in runtime.

Model.reflections


i found this collection which contains all the information about the current model reflections.
for example.

  • .macro: this will return the type of the current reflection (:has_many, etc..)

  • .primary_key_name: the reflection primary key

  • .options: the reflection SQL join options

  • etc. etc.



for example, the following code will show me all the reflections for a model named Article:

  1. >> y Article.reflections.values.collect {|e| e.macro.to_s   “ => ”  e.primary_key_name.to_s }  
  2. —-   
  3. - has_many => taggee_id  
  4. - belongs_to => layout_id  
  5. - has_many => article_id  
  6. - has_one => subject_id  
  7. - belongs_to => user_id  
  8. - has_many => taggee_id  
  9. => nil  

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