feat(assistance): History Model for Knowledge base added

ref: #605 #609

app/assistance/models/__init__.py

@@ -0,0 +1 @@
+from .knowledge_base_history import KnowledgeBaseHistory    # pylint: disable=W0611:unused-import

app/assistance/models/knowledge_base_history.py

@@ -0,0 +1,53 @@
+from django.db import models
+
+from core.models.model_history import ModelHistory
+
+from assistance.models.knowledge_base import KnowledgeBase
+
+
+
+class KnowledgeBaseHistory(
+    ModelHistory
+):
+
+
+    class Meta:
+
+        db_table = 'assistance_knowledge_base_history'
+
+        ordering = ModelHistory._meta.ordering
+
+        verbose_name = 'Knowledge Base History'
+
+        verbose_name_plural = 'Knowledge Base History'
+
+
+    model = models.ForeignKey(
+        KnowledgeBase,
+        blank = False,
+        help_text = 'Model this note belongs to',
+        null = False,
+        on_delete = models.CASCADE,
+        related_name = 'history',
+        verbose_name = 'Model',
+    )
+
+    table_fields: list = []
+
+    page_layout: dict = []
+
+
+    def get_object(self):
+
+        return self
+
+
+    def get_serialized_model(self, serializer_context):
+
+        model = None
+
+        from assistance.serializers.knowledge_base import KnowledgeBaseBaseSerializer
+
+        model = KnowledgeBaseBaseSerializer(self.model, context = serializer_context)
+
+        return model