sync from local backup

learn/serializers.py

@@ -0,0 +1,196 @@
+from rest_framework import serializers
+from .models import Course, Chapter, ChapterContent, CourseMaterial
+
+
+class ChapterSerializer(serializers.ModelSerializer):
+    video_poster_url = serializers.SerializerMethodField()
+    video_local_url = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Chapter
+        fields = ['id', 'title', 'sort_order', 'duration', 'is_free', 'video_url', 'video_source', 'video_local_url', 'video_poster_url', 'created_at', 'updated_at']
+
+    def get_video_poster_url(self, obj):
+        if obj.video_poster:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.video_poster.url)
+            return obj.video_poster.url
+        return ''
+
+    def get_video_local_url(self, obj):
+        if obj.video_local:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.video_local.url)
+            return obj.video_local.url
+        return ''
+
+
+class ChapterContentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ChapterContent
+        fields = ['id', 'chapter', 'content_md', 'content_html', 'md_file_path', 'updated_at']
+
+
+class MaterialSerializer(serializers.ModelSerializer):
+    file_url = serializers.SerializerMethodField()
+    file_size_display = serializers.SerializerMethodField()
+    file_type_display = serializers.SerializerMethodField()
+
+    class Meta:
+        model = CourseMaterial
+        fields = ['id', 'title', 'file_url', 'file_type', 'file_type_display', 'file_size', 'file_size_display', 'download_count', 'sort_order', 'created_at']
+
+    def get_file_url(self, obj):
+        if obj.file:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.file.url)
+            return obj.file.url
+        return ''
+
+    def get_file_size_display(self, obj):
+        size = obj.file_size
+        if size < 1024:
+            return f'{size} B'
+        elif size < 1024 * 1024:
+            return f'{size / 1024:.1f} KB'
+        else:
+            return f'{size / (1024 * 1024):.1f} MB'
+
+    def get_file_type_display(self, obj):
+        type_map = {
+            'pdf': 'PDF',
+            'code': '代码',
+            'doc': '文档',
+            'video': '视频',
+            'dataset': '数据集',
+            'zip': '压缩包',
+            'other': '其他',
+        }
+        return type_map.get(obj.file_type, '其他')
+
+
+class ChapterSerializer(serializers.ModelSerializer):
+    video_poster_url = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Chapter
+        fields = ['id', 'title', 'sort_order', 'duration', 'is_free', 'video_url', 'video_poster_url', 'created_at', 'updated_at']
+
+    def get_video_poster_url(self, obj):
+        if obj.video_poster:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.video_poster.url)
+            return obj.video_poster.url
+        return ''
+
+
+class ChapterContentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = ChapterContent
+        fields = ['id', 'chapter', 'content_md', 'content_html', 'md_file_path', 'updated_at']
+
+
+class CourseListSerializer(serializers.ModelSerializer):
+    author_name = serializers.SerializerMethodField()
+    chapters_count = serializers.SerializerMethodField()
+    students_count = serializers.SerializerMethodField()
+    cover_image_url = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Course
+        fields = [
+            'id', 'title', 'description', 'category', 'level',
+            'cover_image_url', 'color', 'icon_name', 'author_name',
+            'chapters_count', 'students_count', 'status',
+            'sort_order', 'is_hot', 'is_new', 'created_at', 'updated_at',
+        ]
+
+    def get_chapters_count(self, obj):
+        return obj.chapters.count()
+
+    def get_students_count(self, obj):
+        return 0
+
+    def get_cover_image_url(self, obj):
+        if obj.cover_image:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.cover_image.url)
+            return obj.cover_image.url
+        return ''
+
+    def get_author_name(self, obj):
+        if obj.author:
+            return obj.author.get_full_name() or obj.author.username
+        return ''
+
+
+class CourseDetailSerializer(serializers.ModelSerializer):
+    author_name = serializers.SerializerMethodField()
+    chapters = ChapterSerializer(many=True, read_only=True)
+    chapters_count = serializers.SerializerMethodField()
+    students_count = serializers.SerializerMethodField()
+    cover_image_url = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Course
+        fields = [
+            'id', 'title', 'description', 'category', 'level',
+            'cover_image_url', 'color', 'icon_name', 'author_name',
+            'chapters', 'chapters_count', 'students_count', 'status',
+            'sort_order', 'is_hot', 'is_new', 'created_at', 'updated_at',
+        ]
+
+    def get_chapters_count(self, obj):
+        return obj.chapters.count()
+
+    def get_students_count(self, obj):
+        return 0
+
+    def get_cover_image_url(self, obj):
+        if obj.cover_image:
+            request = self.context.get('request')
+            if request:
+                return request.build_absolute_uri(obj.cover_image.url)
+            return obj.cover_image.url
+        return ''
+
+    def get_author_name(self, obj):
+        if obj.author:
+            return obj.author.get_full_name() or obj.author.username
+        return ''
+
+
+class CourseCreateUpdateSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Course
+        fields = ['title', 'description', 'category', 'level', 'cover_image', 'color', 'icon_name', 'status', 'sort_order', 'is_hot', 'is_new']
+
+    def create(self, validated_data):
+        validated_data['author'] = self.context['request'].user
+        return super().create(validated_data)
+
+
+class CourseManageSerializer(serializers.ModelSerializer):
+    author_name = serializers.SerializerMethodField()
+    chapters_count = serializers.SerializerMethodField()
+
+    class Meta:
+        model = Course
+        fields = [
+            'id', 'title', 'category', 'level', 'status',
+            'sort_order', 'is_hot', 'is_new', 'chapters_count',
+            'author_name', 'created_at', 'updated_at',
+        ]
+
+    def get_chapters_count(self, obj):
+        return obj.chapters.count()
+
+    def get_author_name(self, obj):
+        if obj.author:
+            return obj.author.get_full_name() or obj.author.username
+        return ''