quotas information by product - change broker & attribute sale unit

apps/product/models.py

@@ -144,15 +144,11 @@ class Attribute(BaseModel):
         null=True
     )
     name = models.CharField(max_length=100, default='empty')
-    type_choices = (
-        ('K', 'Per Kilo'),
-        ('', ''),
-    )
-    type = models.CharField(
-        max_length=10,
-        choices=type_choices,
-        default='empty',
-        help_text='type of attribute like: calculate product by kilogram'
+    type = models.ForeignKey(
+        'SaleUnit',
+        on_delete=models.CASCADE,
+        related_name="attributes",
+        null=True
     )
 
     is_global = models.BooleanField(default=False)
@@ -194,10 +190,6 @@ class AttributeValue(BaseModel):
 class Broker(BaseModel):
     """ Broker for product """
 
-    CALCULATION_CHOICES = (
-        ('K', 'Per Kilo'),
-        ('', ''),
-    )
     BROKER_TYPES = (
         ('public', 'PUBLIC'),
         ('exclusive', 'EXCLUSIVE')
@@ -215,10 +207,11 @@ class Broker(BaseModel):
         related_name='product_organization',
         null=True
     )
-    calculation_strategy = models.CharField(
-        max_length=3,
-        choices=CALCULATION_CHOICES,
-        default='empty'
+    calculation_strategy = models.ForeignKey(
+        'SaleUnit',
+        on_delete=models.CASCADE,
+        related_name='brokers',
+        null=True
     )
     broker_type = models.CharField(choices=BROKER_TYPES, max_length=20, null=True)
     required = models.BooleanField(default=False)
@@ -239,12 +232,7 @@ class SaleUnit(BaseModel):
         related_name='sale_unit',
         null=True
     )
-    unit_choices = (
-        ('10P', '10KG Package'),
-        ('50P', '50KG Package'),
-        ('', ''),
-    )
-    unit = models.CharField(max_length=10, choices=unit_choices, null=True)
+    unit = models.CharField(max_length=250, null=True)
     variation_coefficient = models.IntegerField(default=0)
     required = models.BooleanField(default=False)