"pre_save signal can modify the instance before saving, but if not included in update_fields, changes will not be stored in the database."
"The SQL query created later in the save process will only consider fields listed in update_fields, which could lead to unexpected results."
In my first Django project focused on tracking gym workouts, I faced an issue where modifications made in the pre_save signal were not saved to the database. This incident highlighted the importance of understanding the relationship between the pre_save signal and the update_fields argument. When using pre_save to enforce completion conditions on exercise sessions, it is crucial that any modified fields by the signal are included in update_fields during save(), or else these changes will not persist, leading to potentially incorrect application behavior. My goal in sharing this experience is to help others avoid similar pitfalls.
Read at Mirek Dugosz personal website
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