dynamic pricing

backend/core/settings.py

@@ -295,6 +295,11 @@ UNFOLD = {
                         "icon": "chat",  
                         "link": reverse_lazy("admin:product_commentmodel_changelist"),
                     },
+                    {
+                        "title": _("قیمت دلار"),
+                        "icon": "payments",  
+                        "link": reverse_lazy("admin:product_dollormodel_changelist"),
+                    },
 
                 ],
             },

backend/product/admin.py

@@ -15,3 +15,7 @@ class CategoryModelAdmin(ModelAdmin):
 @admin.register(CommentModel)
 class CommentAdmin(ModelAdmin):
     pass
+
+@admin.register(DollorModel)
+class DollorAdmin(ModelAdmin):
+    readonly_fields = ('price',)

backend/product/models.py

@@ -2,6 +2,8 @@ from django.db import models
 from django.utils.text import slugify
 from account.models import User
 from django.urls import reverse
+import requests
+
 
 class CategoryModel(models.Model):
     name = models.CharField(max_length=50, verbose_name='نام دسته‌بندی')
@@ -53,10 +55,52 @@ class CategoryModel(models.Model):
             category = category.parent
         return breadcrumb[::-1]
       
+class DollorModel(models.Model):
+    price = models.FloatField(null=True, blank=True)
+    defualt_price = models.FloatField(null=True, blank=True, default=80000.0)
+    # these fields will avoid dublicate of this model
+    unique = (('unique', 'unique'),)
+    unique_filed = models.CharField(max_length=20, choices=unique, unique=True, default='unique')
+    def __str__(self):
+        return str(self.price)
+    def save(self, *args, **kwargs):
+        if not self.price:
+            self.update_price()
+        super().save(*args, **kwargs)
+
+    def update_price(self):
+        self.price = self.get_usd_price()
+
+    def get_usd_price(self):
+        try:
+            api_usd = "https://api.nobitex.ir/v2/orderbook/USDTIRT"
+            response = requests.get(api_usd)
+            data = response.json()
+            price = int(data["lastTradePrice"])
+            price_in_usd = price / 10.0
+            print('\n\nprice from api \n\n')
+        except:
+            if self.price:
+                print('\n\nprice from last price \n\n')
+                return self.price
+                
+            else:
+                print('\n\nprice from defualt price \n\n')
+                return self.defualt_price
+        return price_in_usd
+    
+
+
 class ProductModel(models.Model):
     name = models.CharField(max_length=255)
     description = models.TextField()
-    price = models.PositiveIntegerField(default=0)
+    price = models.PositiveIntegerField(default=0, help_text='قیمت')
+    currency_type = (
+        ('dollor', 'دلار'),
+        ('toman', 'تومان'),
+        ('derham', 'درهم')
+    )
+    currency = models.CharField(verbose_name='نوع ارز', max_length=20, choices=currency_type)
     image = models.ImageField(upload_to='product_images/')
     rating = models.PositiveIntegerField(default=0)
     view = models.IntegerField(default=0, verbose_name='بازدید')
@@ -75,14 +119,6 @@ class ProductModel(models.Model):
         formatted_num = "{:,.0f}".format(discount_price)
         return formatted_num
 
-    def discount_price(self):
-        discount_price = int(self.price * (100 - self.discount) / 100)
-        return discount_price
-
-    def format_price(self):
-        price = self.price
-        formatted_num = "{:,.0f}".format(price)
-        return formatted_num
 
     def __str__(self):
         return self.name

backend/product/serializers.py

@@ -1,14 +1,28 @@
 from .models import *
 from rest_framework import serializers
 
-class ProductSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = ProductModel
-        fields = "__all__"
 class ProductChatSerializer(serializers.ModelSerializer):
+    price = serializers.SerializerMethodField()
     class Meta:
         model = ProductModel
         fields = ['name', 'description', 'price', 'in_stock', 'discount', ]
+    def get_price(self, obj):
+        dollor_object, _ = DollorModel.objects.get_or_create(unique_filed='unique')
+        dollor_price = dollor_object.price
+        dollar_to_dirham = 0.27
+        if dollor_price is None:
+            raise ValidationError({"dollor_price": "The 'dollor_price' must be provided in the context for dollar pricing."})
+        if obj.currency == 'toman':
+            return obj.price
+        elif obj.currency == 'dollor':
+            return obj.price * dollor_price
+        elif obj.currency == 'derham':
+            return obj.price * dollor_price * dollar_to_dirham
+
+class ProductSerializer(ProductChatSerializer):
+    class Meta:
+        model = ProductModel
+        fields = "__all__"
 
 class CommentSerializer(serializers.ModelSerializer):
     class Meta: