Django relationships

Hi Django developers,

i am new in Python,

i want to develop a simple app stock management.

can you give me a brief idea how to add device to stock if it hasnt assigned to employee

i have below models

class Device(models.Model):

STATUS = ( 

('in use', in use),

 ('available', 'available')

)

    status =models.Charfield(choices=STATUS, max_length=32)

    name = models.Charfield(max_length=32)

class Employee(models.Model):

    name = models.Charfield(max_length=32)

class Assign(models.Model):

   notebook =  models.ForeignKey(' Device  ', on_delete=models.CASCADE)

    subscriber = models.ForeignKey('Employee', on_delete=models.CASCADE)

class Stock(models.Model):

    pass

I want if device is already has subscribers then aply its status to 'in_use' and remove it from Stock model and if device status is available then move it to Stock

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