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PERF: Fix N+1 queries on /categories route (#19585)

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Featured topics are eventually serialized by `ListableTopicSerializer`
which calls `Topic#image_url` which requires us to preload
`Topic#topic_thumbnails`.
This commit is contained in:
Alan Guo Xiang Tan
2022-12-23 04:29:49 +08:00
committed by GitHub
parent a8ee56ebee
commit a7f30cfcf7
2 changed files with 15 additions and 5 deletions
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11
spec/requests/categories_controller_spec.rb
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@@ -302,10 +302,12 @@ RSpec.describe CategoriesController do
expect(category_response["subcategory_list"][0]["id"]).to eq(subcategory.id)
end
it "does not n+1 with multiple topics" do
it "does not result in N+1 queries problem with multiple topics" do
category1 = Fabricate(:category)
category2 = Fabricate(:category)
upload = Fabricate(:upload)
topic1 = Fabricate(:topic, category: category1)
topic2 = Fabricate(:topic, category: category1, image_upload: upload)
CategoryFeaturedTopic.feature_topics
SiteSetting.desktop_category_page_style = "categories_with_featured_topics"
@@ -320,9 +322,10 @@ RSpec.describe CategoriesController do
end
category_response = response.parsed_body["category_list"]["categories"].find { |c| c["id"] == category1.id }
expect(category_response["topics"].count).to eq(1)
expect(category_response["topics"].count).to eq(2)
topic2 = Fabricate(:topic, category: category2)
upload = Fabricate(:upload)
topic3 = Fabricate(:topic, category: category2, image_upload: upload)
CategoryFeaturedTopic.feature_topics
second_request_queries = track_sql_queries do
@@ -332,7 +335,7 @@ RSpec.describe CategoriesController do
category1_response = response.parsed_body["category_list"]["categories"].find { |c| c["id"] == category1.id }
category2_response = response.parsed_body["category_list"]["categories"].find { |c| c["id"] == category2.id }
expect(category1_response["topics"].size).to eq(1)
expect(category1_response["topics"].size).to eq(2)
expect(category2_response["topics"].size).to eq(1)
expect(first_request_queries.count).to eq(second_request_queries.count)