Difference between Preload, Include, Eager Load and Joins in Rails?

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What are rubygems? Any favorites not including rails? Any that you''ve worked on personally?

rubygems is package manager software for ruby libraries (i.e. gems). The package manager has basic CRUD operations, dependency trees, and supports asynchronous communication between multiple gem servers.

What is ActiveSupport Concern and how is it different from using modules?

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  1. Map vs select?
  2. PUT vs PATCH?
  3. gem vs engine vs plugin
  4. gem versioning: ~> 4.3, ~> 4.3.0
  5. merge vs rebase
  6. scope vs class method
  7. Can unique key column have null values?
  8. What is DOM? How do you select an element from DOM?

 

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