I am saving the form data into a model instance. There are fields where the user can enter values from 0 and above or leave them empty. Now I should assign them to a field.
Eg code
def update(self, my_val):
self.my_val = my_val or None
This above code works fine for values of 1 and above. But not for 0. How can I allow for 0 and positive numbers and if my_val is an empty string then I should store it as None. How can I do that?
You can use the ternary operator in Python.
def update(self, my_val):
self.my_val = None if my_val=='' else my_val
This will store None if it is empty string(that is what mentioned in Question), otherwise it will store it as it is.
Likely it is more readable here to work with an if check, so:
def update(self, my_val):
if not my_val and my_val != 0:
self.my_val = None
else:
self.my_val = my_valThe reason this happens is because the … or … first checks the first operand and if the truthiness is False, it returns the second operand. Since the empty string, None, and 0 all have truthiness False, it thus means that it will in that case use None.
