On Saturday, 5 July 2014 02:33:14 UTC-5, Arup Rakshit wrote:
I really don't understand the actual usecase of the *except* method
http://api.rubyonrails.org/classes/ActiveRecord/ SpawnMethods.html#method-i- except
If I don't want a condition to apply in my _query_, then why should I add it?
After adding a condition, what is the point of removing it again. This how the
doco http://api.rubyonrails.org/classes/ActiveRecord/ is saying.SpawnMethods.html#method-i- except
`except` is used when you want to use part of a relation but not necessarily the whole thing. It's not always useful in application code, but when dealing with generic relations it can be really useful:
https://github.com/rails/rails/blob/44b7d6c41610bb8ddd058b3815543985f65bf7ad/activerecord/lib/active_record/relation/finder_methods.rb#L296
Here, `except` is used to remove parts of the relation that `exists?` doesn't want to use.
--Matt Jones
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