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--- wiki2:python:django:tests [2018/10/12 15:52]
alfred [self.client]
+++ wiki2:python:django:tests [2020/08/29 15:11] (actual)
@@ Línea 66: / Línea 66: @@
         self.assertEqual(mail.outbox[0].to[0], email)
 </code>
+====== Articles ======
+===== N+1 Queries =====
+Lets imagine you are creating a view for returning all the courses with some of their authors data. If you run a code like this:
+<code python>
+queryset = Course.objects.all()
+courses = []
+for course in queryset:
+  courses.append({"title": course.title, "author": course.author.name})
+</code>
+This is executing one query (for bringing all courses) and N queries more (one for each author). There is the library [[https://github.com/jmcarp/nplusone|nplusone]] to detect this.
+  * {{ :wiki2:python:django:automating_performance_testing_in_django.zip |}}

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