some parts of product - fix custom pagination - add id to pages list

apps/product/models.py

@@ -0,0 +1,94 @@
+from django.db import models
+from apps.core.models import BaseModel
+
+
+# Create your models here.
+
+class ReferenceProduct(BaseModel):
+    """ Reference product - like: rice """
+
+    name = models.CharField(max_length=250, default='empty')  # noqa
+    type_choices = (
+        ('F', 'Free'),  # free product
+        ('G', 'Governmental')  # government product
+    )
+    type = models.CharField(max_length=3, choices=type_choices)
+    img = models.CharField(max_length=100, default='empty')
+
+    def __str__(self):
+        return f'name: {self.name} - type: {self.type}'
+
+    def save(self, *args, **kwargs):
+        super(ReferenceProduct, self).save(*args, **kwargs)
+
+
+class Product(BaseModel):
+    """ Child of reference product - like: brown rice """
+    name = models.CharField(max_length=250, default='empty')  # noqa
+    type_choices = (
+        ('F', 'Free'),  # free product
+        ('G', 'Governmental')  #
+    )
+    type = models.CharField(max_length=3, choices=type_choices)
+    img = models.CharField(max_length=100, default='empty')
+    reference = models.ForeignKey(
+        ReferenceProduct,
+        on_delete=models.CASCADE,
+        related_name='reference_product',
+        null=True
+    )
+
+    def __str__(self):
+        return f'name: {self.name} - type: {self.type}'
+
+    def save(self, *args, **kwargs):
+        super(Product, self).save(*args, **kwargs)
+
+
+class Attribute(BaseModel):
+    """
+    every reference product have multiple attributes
+    """
+    reference_product = models.ForeignKey(
+        ReferenceProduct,
+        on_delete=models.CASCADE,
+        related_name='reference_attribute',
+        null=True
+    )
+    name = models.CharField(max_length=100, default='empty')
+    type = models.CharField(
+        max_length=255,
+        default='empty',
+        help_text='type of attribute like: calculate product by kilogram'
+    )
+
+    def __str__(self):
+        return f'{self.reference_product.name} - {self.name}'
+
+    def save(self, *args, **kwargs):
+        return super(Attribute, self).save(*args, **kwargs)
+
+
+class AttributeValue(BaseModel):
+    """
+    every child product should have attribute value for
+    reference product attribute
+    """
+    product = models.ForeignKey(
+        Product,
+        on_delete=models.CASCADE,
+        related_name='product_attribute_value',
+        null=True
+    )
+    attribute = models.ForeignKey(
+        Attribute,
+        on_delete=models.CASCADE,
+        related_name='attribute_value'
+    )
+    value = models.IntegerField(default=0)
+
+    def __str__(self):
+        return f'{self.product.name} - {self.attribute.name} - {self.value}'
+
+    def save(self, *args, **kwargs):
+        return super(AttributeValue, self).save(*args, **kwargs)