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Understand Scope Returns Discussion

Discussion for Understand Scope Returns

Excellent episode Collin!

Another tip is you could keep the future_events scope returning a Relation. And possibly break the sorting out in case it’s used for other queries as your application grows.

class Event < ApplicationRecord
  scope :future_events, -> { where("start_time > ?", Time.current) }
  scope :newest_first, -> { order(start_time: :asc) }

  def self.first_future_event
    future_events.newest_first.first
  end
end
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Elaborating further on this theme of composable scopes, and being handy both for tests and for reporting, leaning on the predicate builder and a default parameter:

scope :future, ->(after = Time.current) { where.not(start_time: ..after) }

There’s also an argument for using a CurrentAttributes value for time, since application code depending directly on Time.current may fall into the trap of assuming it is the same value throughout a single request’s execution, when of course it may not be, leading to some really subtle intermittent bugs, especially at the cusp of midnight.

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Very interesting episode, Collin! TIL you could get the path to the source of a method right from the console ✨

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Thank you! Glad you enjoyed it and learned something new!!

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amazing and wild

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