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strika/preload_polymorphic.rb

Created October 28, 2016 07:42
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Preloading polymorphic associations
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preload_polymorphic.rb
class Alert
belongs_to :alertable, polymorphic: true
belongs_to :incident, ->{ joins(:alerts).where(alerts: { id: Alert.where(alertable_type: "Incident") }) }, foreign_key: :alertable_id
belongs_to :action, ->{ joins(:alerts).where(alerts: { id: Alert.where(alertable_type: "Action") }) }, foreign_key: :alertable_id
end
Alert.includes(incident: :categories, action: :agencies)
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