Details
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Type:
Task
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Status: Closed
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Resolution: Done
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Affects Version/s: None
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Fix Version/s: 4.0.0 final
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Component/s: None
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Labels:
Description
With new eager loading, when relation is eager loaded and empty, it triggers extra database query on each request to association.
class Post |
include Mongoid::Document
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belongs_to :person |
end
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class Person |
include Mongoid::Document
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has_many :posts |
end
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100.times do |i| |
Person.create!
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end
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# generates 102 requests to database
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count_queries do |
Person.includes(:posts).each do |person| |
person.posts.to_a
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end |
end |