Changes between Initial Version and Version 1 of Ticket #25787, comment 3
- Timestamp:
- Nov 21, 2015, 9:06:30 AM (9 years ago)
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Ticket #25787, comment 3
initial v1 1 1 If that executes lazily then I am ok with this, thank you. 2 3 However looking at the code for QuerySet it defines an {{{__iter__}}} method but no {{{__contains__}}} method and {{{__iter__}}} executes {{{_fetch_all}}}, which means instead of doing an {{{.exists()}}} query using {{{in}}} on a query set fetches a large number of objects and iterates over the result. This is very inefficient.