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Use a nested query to save a rountrip #4

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Use a nested query to save a rountrip #4

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10 changes: 1 addition & 9 deletions lib/fast_page/active_record_methods.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -8,15 +8,7 @@ def deferred_join_load

id_scope = dup
id_scope = id_scope.except(:includes) unless references_eager_loaded_tables?
ids = id_scope.pluck(:id)

if ids.empty?
@records = []
@loaded = true
return self
end

@records = where(id: ids).unscope(:limit).unscope(:offset).load
@records = where(id: id_scope).unscope(:limit).unscope(:offset).load
@loaded = true

self
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12 changes: 5 additions & 7 deletions test/fast_page_test.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ def test_executes_extra_id_query

User.all.limit(5).fast_page

assert_equal 2, count
assert_equal 1, count

ActiveSupport::Notifications.unsubscribe("sql.active_record")
end
Expand All @@ -40,9 +40,8 @@ def test_correct_sql

User.all.limit(5).fast_page

assert_equal 2, queries.size
assert_includes queries, 'SELECT "users"."id" FROM "users" LIMIT ?'
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (?, ?, ?, ?, ?)'
assert_equal 1, queries.size
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (SELECT "users"."id" FROM "users" LIMIT ?)'

ActiveSupport::Notifications.unsubscribe("sql.active_record")
end
Expand All @@ -56,11 +55,10 @@ def test_removes_includes_id_query

User.all.includes(:organization).limit(50).fast_page

assert_equal 3, queries.size
assert_equal 2, queries.size

# Organizations are not included on the ID query (not needed)
assert_includes queries, 'SELECT "users"."id" FROM "users" LIMIT ?'
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (SELECT "users"."id" FROM "users" LIMIT ?)'
# Includes are still loaded
assert_includes queries, 'SELECT "organizations".* FROM "organizations" WHERE "organizations"."id" = ?'

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5 changes: 2 additions & 3 deletions test/pagy_test.rb
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Expand Up @@ -47,11 +47,10 @@ def test_pagy_works
assert_equal 1, pagy.page
assert_equal 2, pagy.next
assert_equal 5, records.size
assert_equal 3, queries.size
assert_equal 2, queries.size

assert_includes queries, 'SELECT COUNT(*) FROM "users"'
assert_includes queries, 'SELECT "users"."id" FROM "users" LIMIT ? OFFSET ?'
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (?, ?, ?, ?, ?)'
assert_includes queries, 'SELECT "users".* FROM "users" WHERE "users"."id" IN (SELECT "users"."id" FROM "users" LIMIT ? OFFSET ?)'

ActiveSupport::Notifications.unsubscribe("sql.active_record")
end
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