multi currency logic for course prices added

apps/course/admin/course.py

@@ -269,7 +269,7 @@ class CourseAdmin(DirectCourseAdmin):
     warn_unsaved_form = True
     search_fields = ('id','title', 'description')
     exclude = ('slug', )
-    readonly_fields = ('final_price',)
+    readonly_fields = ('final_price', 'final_price_rub')
     autocomplete_fields = ('category', 'professor',)
     list_filter_submit = True
     change_form_show_cancel_button = True
@@ -280,8 +280,10 @@ class CourseAdmin(DirectCourseAdmin):
     
     conditional_fields = {
         'price': "is_free == false",
+        'price_rub': "is_free == false",
         'discount_percentage': "is_free == false",
         'final_price': "is_free == false",
+        'final_price_rub': "is_free == false",
         'online_link': "is_online",
         'video_file': "video_type == 'video_file'",
         'video_link': "video_type == 'youtube_link'",
@@ -308,8 +310,8 @@ class CourseAdmin(DirectCourseAdmin):
         }),
         (_('Pricing'), {
             'fields': (
-                ('is_free', 'price'),
-                ('discount_percentage', 'final_price')
+                ('is_free', 'price', 'price_rub'),
+                ('discount_percentage', 'final_price', 'final_price_rub')
             ),
             'classes': ['tab'],
         }),
@@ -347,12 +349,18 @@ class CourseAdmin(DirectCourseAdmin):
         
         if instance.discount_percentage > 0:
             return format_html(
-                '<span class="line-through text-gray-400 mr-2">${}</span>'
-                '<span class="text-green-600 font-medium">${}</span>',
+                '<span class="block text-xs text-gray-400">USD: <span class="line-through">${}</span> -> <span class="text-green-600 font-medium">${}</span></span>'
+                '<span class="block text-xs text-gray-400 mt-1">RUB: <span class="line-through">₽{}</span> -> <span class="text-green-600 font-medium">₽{}</span></span>',
                 instance.price,
-                instance.final_price
+                instance.final_price,
+                instance.price_rub,
+                instance.final_price_rub,
             )
-        return format_html('<span>${}</span>', instance.final_price)
+        return format_html(
+            '<span class="block">USD: ${}</span><span class="block mt-1">RUB: ₽{}</span>',
+            instance.final_price,
+            instance.final_price_rub,
+        )
     
     
     actions_row = ["add_student_to_course"]

apps/course/migrations/0010_course_rub_prices.py

@@ -0,0 +1,21 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course', '0009_alter_course_description_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='course',
+            name='final_price_rub',
+            field=models.DecimalField(blank=True, decimal_places=2, default=0.0, help_text='This field is automatically calculated based on the discount percentage.', max_digits=10, verbose_name='Course Final Price (RUB)'),
+        ),
+        migrations.AddField(
+            model_name='course',
+            name='price_rub',
+            field=models.DecimalField(decimal_places=2, default=0.0, max_digits=10, verbose_name='Course Price (RUB)'),
+        ),
+    ]

apps/course/models/course.py

@@ -151,6 +151,9 @@ STATUS_TRANSLATIONS = {
     }
 }
 
+CURRENCY_USD = 'USD'
+CURRENCY_RUB = 'RUB'
+
 def normalize_level(value):
     if not value:
         return 'beginner'
@@ -292,11 +295,16 @@ class Course(models.Model):
     status = models.JSONField(default=list, null=True, blank=True, verbose_name=_('Course Status'))
     is_free = models.BooleanField(default=True, verbose_name=_('Is Free'))
     price = models.DecimalField(max_digits=10, decimal_places=2, default=0.00, verbose_name=_('Course Price'))
+    price_rub = models.DecimalField(max_digits=10, decimal_places=2, default=0.00, verbose_name=_('Course Price (RUB)'))
     discount_percentage = models.PositiveIntegerField(default=0, validators=[MinValueValidator(0), MaxValueValidator(100)], verbose_name=_('Discount Percentage'))
     final_price = models.DecimalField(
         verbose_name=_('Course Final Price'), decimal_places=2, max_digits=10, default=0.00, blank=True,
         help_text=_('This field is automatically calculated based on the discount percentage.')
     )
+    final_price_rub = models.DecimalField(
+        verbose_name=_('Course Final Price (RUB)'), decimal_places=2, max_digits=10, default=0.00, blank=True,
+        help_text=_('This field is automatically calculated based on the discount percentage.')
+    )
 
     is_group_chat_locked = models.BooleanField(
         default=False, 
@@ -339,6 +347,26 @@ class Course(models.Model):
     def recalculate_lessons_count(self):
         return self.__class__.recalculate_lessons_count_for_course(self.pk)
 
+    def get_currency_for_language(self, lang):
+        normalized = (lang or 'en').lower()
+        if normalized.startswith('ru'):
+            return CURRENCY_RUB
+        return CURRENCY_USD
+
+    def get_price_for_language(self, lang):
+        if self.is_free:
+            return Decimal('0.00')
+        if self.get_currency_for_language(lang) == CURRENCY_RUB:
+            return Decimal(self.price_rub or 0)
+        return Decimal(self.price or 0)
+
+    def get_final_price_for_language(self, lang):
+        if self.is_free:
+            return Decimal('0.00')
+        if self.get_currency_for_language(lang) == CURRENCY_RUB:
+            return Decimal(self.final_price_rub or 0)
+        return Decimal(self.final_price or 0)
+
 
     def save(self, *args, **kwargs):
         self.title = format_multilingual_field(self.title)
@@ -424,21 +452,31 @@ class Course(models.Model):
         ]
         self.features = format_multilingual_field(self.features)
 
-        # Ensure consistency: if price is 0, set is_free to True and discount_percentage to 0
-        if self.price == 0:
+        usd_price = Decimal(self.price or 0)
+        rub_price = Decimal(self.price_rub or 0)
+
+        # Ensure consistency: if both prices are 0, set is_free to True and discount_percentage to 0
+        if usd_price == 0 and rub_price == 0:
             self.is_free = True
             self.discount_percentage = 0
             self.final_price = Decimal('0.00')
+            self.final_price_rub = Decimal('0.00')
         elif self.is_free:
             self.price = Decimal('0.00')
+            self.price_rub = Decimal('0.00')
             self.discount_percentage = 0
             self.final_price = Decimal('0.00')
+            self.final_price_rub = Decimal('0.00')
         elif self.discount_percentage > 0:
-            discount_amount = (self.price * self.discount_percentage) / 100
-            final_price = self.price - discount_amount
-            self.final_price = Decimal(math.ceil(final_price)).quantize(Decimal('0.00'))
+            usd_discount_amount = (usd_price * self.discount_percentage) / 100
+            rub_discount_amount = (rub_price * self.discount_percentage) / 100
+            usd_final_price = usd_price - usd_discount_amount
+            rub_final_price = rub_price - rub_discount_amount
+            self.final_price = Decimal(math.ceil(usd_final_price)).quantize(Decimal('0.00'))
+            self.final_price_rub = Decimal(math.ceil(rub_final_price)).quantize(Decimal('0.00'))
         else:
-            self.final_price = Decimal(math.ceil(self.price)).quantize(Decimal('0.00'))
+            self.final_price = Decimal(math.ceil(usd_price)).quantize(Decimal('0.00'))
+            self.final_price_rub = Decimal(math.ceil(rub_price)).quantize(Decimal('0.00'))
 
         super().save(*args, **kwargs)
 

apps/course/serializers/admin.py

@@ -20,7 +20,21 @@ from apps.course.models.course import extract_text_from_json, get_localized_fiel
 
 def get_request_lang(serializer_instance):
     request = serializer_instance.context.get('request')
-    return getattr(request, 'LANGUAGE_CODE', None) or 'en'
+    language_code = getattr(request, 'LANGUAGE_CODE', None)
+    if language_code:
+        return str(language_code).lower()
+
+    header_value = ''
+    if request is not None:
+        if hasattr(request, 'headers'):
+            header_value = request.headers.get('Accept-Language', '')
+        if not header_value and hasattr(request, 'META'):
+            header_value = request.META.get('HTTP_ACCEPT_LANGUAGE', '')
+
+    if header_value:
+        return header_value.split(',')[0].strip().lower()
+
+    return 'en'
 
 class AdminLessonSerializer(serializers.ModelSerializer):
     class Meta:
@@ -102,8 +116,10 @@ class AdminCourseListSerializer(serializers.ModelSerializer):
             'status',
             'is_free',
             'price',
+            'price_rub',
             'discount_percentage',
             'final_price',
+            'final_price_rub',
             'participant_count',
             'created_at'
         ]
@@ -162,8 +178,10 @@ class AdminCourseDetailSerializer(serializers.ModelSerializer):
             'status',
             'is_free',
             'price',
+            'price_rub',
             'discount_percentage',
             'final_price',
+            'final_price_rub',
             'is_group_chat_locked',
             'is_professor_chat_locked',
             'timing',
@@ -172,7 +190,7 @@ class AdminCourseDetailSerializer(serializers.ModelSerializer):
             'created_at',
             'updated_at'
         ]
-        read_only_fields = ['id', 'final_price', 'created_at', 'updated_at']
+        read_only_fields = ['id', 'final_price', 'final_price_rub', 'created_at', 'updated_at']
 
     def get_participant_count(self, obj):
         return obj.participants.count()

apps/course/serializers/course.py

@@ -5,10 +5,31 @@ from apps.course.models import Course, CourseCategory, Attachment, Glossary, Les
 from apps.course.models.course import get_localized_field
 from apps.chat.models import RoomMessage
 from apps.account.serializers import UserProfileSerializer
+from decimal import Decimal
 import ast
 import json
 
 
+def resolve_request_lang(request, default='en'):
+    language_code = getattr(request, 'LANGUAGE_CODE', None)
+    if language_code:
+        return str(language_code).lower()
+
+    if not request:
+        return default
+
+    header_value = ''
+    if hasattr(request, 'headers'):
+        header_value = request.headers.get('Accept-Language', '')
+    if not header_value and hasattr(request, 'META'):
+        header_value = request.META.get('HTTP_ACCEPT_LANGUAGE', '')
+
+    if header_value:
+        return header_value.split(',')[0].strip().lower()
+
+    return default
+
+
 
 class CourseCategorySerializer(serializers.ModelSerializer):
     course_count = serializers.SerializerMethodField()
@@ -21,7 +42,7 @@ class CourseCategorySerializer(serializers.ModelSerializer):
 
     def _lang(self):
         request = self.context.get('request')
-        return getattr(request, 'LANGUAGE_CODE', None) or 'en'
+        return resolve_request_lang(request)
 
     def get_name(self, obj):
         return get_localized_field(self._lang(), obj.name)
@@ -41,6 +62,7 @@ class CourseListSerializer(serializers.ModelSerializer):
     price = serializers.SerializerMethodField()
     discount_percentage = serializers.SerializerMethodField()
     final_price = serializers.SerializerMethodField()
+    currency = serializers.SerializerMethodField()
     is_free = serializers.SerializerMethodField() 
     title = serializers.SerializerMethodField()
     slug = serializers.SerializerMethodField()
@@ -68,11 +90,12 @@ class CourseListSerializer(serializers.ModelSerializer):
             'price',
             'discount_percentage',
             'final_price',
+            'currency',
         ]
 
     def _lang(self):
         request = self.context.get('request')
-        return getattr(request, 'LANGUAGE_CODE', None) or 'en'
+        return resolve_request_lang(request)
 
     def get_title(self, obj):
         return get_localized_field(self._lang(), obj.title)
@@ -110,22 +133,27 @@ class CourseListSerializer(serializers.ModelSerializer):
         return max(lessons_count, obj.lessons_count)
         
     def get_price(self, obj):
-        if obj.is_free or obj.price == 0:
+        amount = obj.get_price_for_language(self._lang())
+        if obj.is_free or amount == 0:
             return "0.00"
-        return str(obj.price)
+        return str(amount)
         
     def get_discount_percentage(self, obj):
-        if obj.is_free or obj.price == 0:
+        if obj.is_free or obj.get_price_for_language(self._lang()) == 0:
             return 0
         return obj.discount_percentage
         
     def get_final_price(self, obj):
-        if obj.is_free or obj.price == 0:
+        amount = obj.get_final_price_for_language(self._lang())
+        if obj.is_free or amount == 0:
             return "0.00"
-        return str(obj.final_price)
+        return str(amount)
+
+    def get_currency(self, obj):
+        return obj.get_currency_for_language(self._lang())
     
     def get_is_free(self, obj):
-        return obj.is_free or obj.price == 0
+        return obj.is_free or (Decimal(obj.price or 0) == 0 and Decimal(obj.price_rub or 0) == 0)
     
     
 class CourseDetailSerializer(serializers.ModelSerializer):
@@ -142,6 +170,7 @@ class CourseDetailSerializer(serializers.ModelSerializer):
     price = serializers.SerializerMethodField()
     discount_percentage = serializers.SerializerMethodField()
     final_price = serializers.SerializerMethodField()
+    currency = serializers.SerializerMethodField()
     is_free = serializers.SerializerMethodField()
     is_professor = serializers.SerializerMethodField()
     title = serializers.SerializerMethodField()
@@ -181,6 +210,7 @@ class CourseDetailSerializer(serializers.ModelSerializer):
             'price',
             'discount_percentage',
             'final_price',
+            'currency',
             'timing',
             'features',
             'last_lesson_id',
@@ -389,25 +419,29 @@ class CourseDetailSerializer(serializers.ModelSerializer):
         return obj.participants.count()
         
     def get_price(self, obj):
-        if obj.is_free or obj.price == 0:
+        amount = obj.get_price_for_language(self._lang())
+        if obj.is_free or amount == 0:
             return "0.00"
-        return str(obj.price)
+        return str(amount)
         
     def get_discount_percentage(self, obj):
-        if obj.is_free or obj.price == 0:
+        if obj.is_free or obj.get_price_for_language(self._lang()) == 0:
             return 0
         return obj.discount_percentage
         
     def get_final_price(self, obj):
-        if obj.is_free or obj.price == 0:
+        amount = obj.get_final_price_for_language(self._lang())
+        if obj.is_free or amount == 0:
             return "0.00"
-        return str(obj.final_price)
+        return str(amount)
+    def get_currency(self, obj):
+        return obj.get_currency_for_language(self._lang())
     def get_is_free(self, obj):
-        return obj.is_free or obj.price == 0
+        return obj.is_free or (Decimal(obj.price or 0) == 0 and Decimal(obj.price_rub or 0) == 0)
 
     def _lang(self):
         request = self.context.get('request')
-        return getattr(request, 'LANGUAGE_CODE', None) or 'en'
+        return resolve_request_lang(request)
 
     def get_title(self, obj):
         return get_localized_field(self._lang(), obj.title)

apps/course/serializers/professor.py

@@ -15,7 +15,7 @@ class ProfessorListSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = User
-        fields = ['id', 'slug', 'fullname', 'avatar','experience_years', 'course_count', 'lesson_count']
+        fields = ['id', 'slug', 'fullname', 'email', 'avatar', 'experience_years', 'course_count', 'lesson_count']
 
 
 class ProfessorDetailSerializer(UserProfileSerializer):

apps/course/tests/test_multiple_roles_api.py

@@ -6,6 +6,7 @@ from django.urls import reverse
 from rest_framework.test import APIClient
 from rest_framework import status
 from django.contrib.auth.models import Group
+from decimal import Decimal
 from apps.account.models import User
 from apps.course.models import Course, CourseCategory, Participant
 from apps.transaction.models import TransactionParticipant
@@ -214,3 +215,40 @@ class MultipleRolesAPITestCase(TestCase):
         
         # user_type field باید بروزرسانی شود
         self.assertEqual(self.user.user_type, User.UserType.PROFESSOR)
+
+    def test_course_detail_serializer_uses_rub_price_for_russian_language(self):
+        """برای زبان روسی باید قیمت روبلی برگردانده شود، نه دلار"""
+        self.user.add_role('professor')
+
+        course = Course.objects.create(
+            title=[
+                {"title": "English Title", "language_code": "en"},
+                {"title": "Русский заголовок", "language_code": "ru"},
+            ],
+            slug='localized-course',
+            category=self.category,
+            professor=self.user,
+            level='beginner',
+            duration=10,
+            lessons_count=5,
+            description='Test description',
+            is_free=False,
+            price=Decimal('100.00'),
+            price_rub=Decimal('7500.00'),
+            discount_percentage=10,
+        )
+
+        from apps.course.serializers import CourseDetailSerializer
+        from django.test import RequestFactory
+
+        factory = RequestFactory()
+        request = factory.get('/', HTTP_ACCEPT_LANGUAGE='ru')
+        request.user = self.user
+        request.LANGUAGE_CODE = 'ru'
+
+        serializer = CourseDetailSerializer(course, context={'request': request})
+        data = serializer.data
+
+        self.assertEqual(data['currency'], 'RUB')
+        self.assertEqual(data['price'], '7500.00')
+        self.assertEqual(data['final_price'], '6750.00')

apps/course/views/admin.py

@@ -64,11 +64,20 @@ class AdminCourseViewSet(viewsets.ModelViewSet):
 
         # Search Query
         search_query = self.request.query_params.get('search', None)
+        has_search = False
         if search_query:
+            has_search = True
+            from django.db.models import Case, When, Value, IntegerField
             queryset = queryset.filter(
                 Q(title__icontains=search_query) |
                 Q(description__icontains=search_query) |
                 Q(short_description__icontains=search_query)
+            ).annotate(
+                search_relevance=Case(
+                    When(title__icontains=search_query, then=Value(2)),
+                    default=Value(1),
+                    output_field=IntegerField()
+                )
             )
 
         # Filters
@@ -95,6 +104,8 @@ class AdminCourseViewSet(viewsets.ModelViewSet):
         if student_id:
             queryset = queryset.filter(participants__student_id=student_id)
 
+        if has_search:
+            return queryset.order_by('-search_relevance', '-id')
         return queryset.order_by('-id')
 
     def perform_create(self, serializer):