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Remove sort in Feed (#4050) 

In from_redis method, statuses retrieved from the database was mapped to
the IDs retrieved from Redis. It was equivalent to order from high to low
because those IDs are sorted in the same order.
Statuses are ordered with the ID by default, so we do not have to reorder.
Sorting statuses in the database is even faster since the IDs are indexed
with B-tree.
This commit is contained in:
Akihiko Odaki (@fn_aki@pawoo.net) 2017-07-03 20:17:27 +09:00 committed by Eugen Rochko
parent a9c326b200
commit f85dbe83c8
2 changed files with 2 additions and 3 deletions
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3
app/models/feed.rb
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@ -20,8 +20,7 @@ class Feed
max_id = '+inf' if max_id.blank? max_id = '+inf' if max_id.blank?
since_id = '-inf' if since_id.blank? since_id = '-inf' if since_id.blank?
unhydrated = redis.zrevrangebyscore(key, "(#{max_id}", "(#{since_id}", limit: [0, limit], with_scores: true).map(&:last).map(&:to_i) unhydrated = redis.zrevrangebyscore(key, "(#{max_id}", "(#{since_id}", limit: [0, limit], with_scores: true).map(&:last).map(&:to_i)
status_map = Status.where(id: unhydrated).cache_ids.map { |s| [s.id, s] }.to_h Status.where(id: unhydrated).cache_ids
unhydrated.map { |id| status_map[id] }.compact
end end
def from_database(limit, max_id, since_id) def from_database(limit, max_id, since_id)

2
spec/models/feed_spec.rb
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@ -2,7 +2,7 @@ require 'rails_helper'
RSpec.describe Feed, type: :model do RSpec.describe Feed, type: :model do
describe '#get' do describe '#get' do
it 'gets statuses with ids in the range, maintining the order from Redis' do it 'gets statuses with ids in the range' do
account = Fabricate(:account) account = Fabricate(:account)
Fabricate(:status, account: account, id: 1) Fabricate(:status, account: account, id: 1)
Fabricate(:status, account: account, id: 2) Fabricate(:status, account: account, id: 2)