Скачать или смотреть Django many-to-many relationships does't save to DB via a from.modelform with commit=False - problem

Django, ManyToManyField save data via forms.ModelForm with commit=False and djnago many-to-many relationship does not save to db. In this video you learn hLow to solved the problem not saving many to many fields via forms.ModelForm.

📗 Detail Article : https://bit.ly/3B6OGHZ

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📝 Note:

🖍When you use a save() on a form, all data – including many-to-many data – is saved without the need for any additional method calls.

🖍 This save() method accepts an optional commit keyword argument, which accepts either True or False. If you call save() with commit=False, then it will return an object that hasn’t yet been saved to the database. In this case, it’s up to you to call save() on the resulting model instance. This is useful if you want to do custom processing on the object before saving it, or if you want to use one of the specialized model saving options. commit is True by default.

👉 But the side effect of using commit=False is seen when your model has a many-to-many relation with another model. If your model has a many-to-many relation and you specify commit=False when you save a form, Django cannot immediately save the form data for the many-to-many relation. This is because it isn’t possible to save many-to-many data for an instance until the instance exists in the database.

🖍 When using commit=False, you have to call save_m2m(). Django adds a save_m2m() method to your ModelForm subclass. After you’ve manually saved the instance produced by the form, you can invoke save_m2m() to save the many-to-many form data.

📗 Examples:
if form.is_valid():
form_data = form.save(commit=False)
form_data .save()
form.save_m2m()


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