some first models of pos & add required to attributes

apps/pos_device/models.py

@@ -3,10 +3,41 @@ from apps.core.models import BaseModel
 
 
 class PaymentCompany(BaseModel):
-    pass
+    name_fa = models.CharField(max_length=250, null=True)
+    name_en = models.CharField(max_length=250, null=True)
+    activation = models.BooleanField(default=False)
+
+    def __str__(self):
+        return f'Payment Company: {self.name_fa}-{self.id}'
+
+    def save(self, *args, **kwargs):
+        return super(PaymentCompany, self).save(*args, **kwargs)
 
 
 class Device(BaseModel):
+    acceptor = models.IntegerField(default=0)
+    terminal = models.IntegerField(default=0)
+    serial = models.TextField(null=True)
+    password = models.CharField(max_length=25, null=True)
+    multi_device = models.BooleanField(default=False)
+    server_in = models.BooleanField(default=False)
+    latitude = models.DecimalField(max_digits=20, decimal_places=10, null=True)
+    longitude = models.DecimalField(max_digits=20, decimal_places=10, null=True)
+    company = models.ForeignKey(
+        PaymentCompany,
+        on_delete=models.CASCADE,
+        related_name='devices',
+        null=True
+    )
+
+    def __str__(self):
+        return f'Device: {self.serial} - {self.id}'
+
+    def save(self, *args, **kwargs):
+        return super(Device, self).save(*args, **kwargs)
+
+
+class DeviceVersion(BaseModel):
     pass