feat: [AXM-1169] adapt VC composition to course credentials (#184)

* feat: [AXM-1169] adapt VC composition to course credentials

* refactor: [AXM-1169] dynamically add fields to serializer

credentials/apps/verifiable_credentials/composition/schemas.py

@@ -20,6 +20,21 @@ class Meta:
         read_only_fields = "__all__"
 
 
+class EducationalOccupationalCourseSchema(serializers.Serializer):  # pylint: disable=abstract-method
+    """
+    Defines Open edX Course.
+    """
+
+    TYPE = "Course"
+
+    id = serializers.CharField(default=TYPE, help_text="https://schema.org/Course")
+    name = serializers.CharField(source="course.title")
+    courseCode = serializers.CharField(source="user_credential.credential.course_id")
+
+    class Meta:
+        read_only_fields = "__all__"
+
+
 class EducationalOccupationalCredentialSchema(serializers.Serializer):  # pylint: disable=abstract-method
     """
     Defines Open edX user credential.
@@ -30,7 +45,19 @@ class EducationalOccupationalCredentialSchema(serializers.Serializer):  # pylint
     id = serializers.CharField(default=TYPE, help_text="https://schema.org/EducationalOccupationalCredential")
     name = serializers.CharField(source="user_credential.credential.title")
     description = serializers.CharField(source="user_credential.uuid")
-    program = EducationalOccupationalProgramSchema(source="*")
+
+    def to_representation(self, instance):
+        """
+        Dynamically add fields based on the type.
+        """
+        representation = super().to_representation(instance)
+
+        if instance.user_credential.credential_content_type.model == "programcertificate":
+            representation["program"] = EducationalOccupationalProgramSchema(instance).data
+        elif instance.user_credential.credential_content_type.model == "coursecertificate":
+            representation["course"] = EducationalOccupationalCourseSchema(instance).data
+
+        return representation
 
     class Meta:
         read_only_fields = "__all__"

credentials/apps/verifiable_credentials/issuance/models.py

@@ -12,6 +12,7 @@
 from django.utils.translation import gettext_lazy as _
 from django_extensions.db.models import TimeStampedModel
 
+from credentials.apps.catalog.models import Course
 from credentials.apps.credentials.models import UserCredential
 from credentials.apps.verifiable_credentials.utils import capitalize_first
 
@@ -183,6 +184,11 @@ def credential_content_type(self):
     def program(self):
         return getattr(self.user_credential.credential, "program", None)
 
+    @property
+    def course(self):
+        course_id = getattr(self.user_credential.credential, "course_id", None)
+        return Course.objects.filter(course_runs__key=course_id).first()
+
     @property
     def platform_name(self):
         if not (site_configuration := getattr(self.user_credential.credential.site, "siteconfiguration", "")):