Menu
While overriding the specific model's save() method, Is it possible determine whether it's a new record or an update?
949
To save changes to an object that's already in the database, use save() . This performs an UPDATE SQL statement behind the scenes. Django doesn't hit the database until you explicitly call save() .
To create a new instance of a model, instantiate it like any other Python class: class Model (**kwargs) The keyword arguments are the names of the fields you've defined on your model. Note that instantiating a model in no way touches your database; for that, you need to save() .
The __str__ method just tells Django what to print when it needs to print out an instance of the any model. It is also what lets your admin panel, go from this. Note: how objects are just plainly numbered. to this.
save() method can be used to insert new record and update existing record and generally used for saving instance of single record(row in mysql) in database. update() is not used to insert records and can be used to update multiple records(rows in mysql) in database.
If self.pk is None it is a new record.
def save(self): if self.pk is None: self.created = datetime.today() self.modified = datetime.today() super(ProjectCost, self).save() This topic has been discussed also here
169
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
