feat: page and page-blocks (#468)

* dev: initiate paper models

* feat: page and page-blocks

* dev: page id filter for page blocks

apiserver/plane/api/serializers/__init__.py

@@ -60,3 +60,5 @@ from .integration import (
 )
 
 from .importer import ImporterSerializer
+
+from .page import PageSerializer, PageBlockSerializer, PageFavoriteSerializer

apiserver/plane/api/serializers/page.py

@@ -0,0 +1,46 @@
+# Third party imports
+from rest_framework import serializers
+
+# Module imports
+from .base import BaseSerializer
+from .issue import IssueFlatSerializer
+from plane.db.models import Page, PageBlock, PageFavorite
+
+
+class PageSerializer(BaseSerializer):
+    is_favorite = serializers.BooleanField(read_only=True)
+
+    class Meta:
+        model = Page
+        fields = "__all__"
+        read_only_fields = [
+            "workspace",
+            "project",
+            "owned_by",
+        ]
+
+
+class PageBlockSerializer(BaseSerializer):
+    issue_detail = IssueFlatSerializer(source="issue", read_only=True)
+
+    class Meta:
+        model = PageBlock
+        fields = "__all__"
+        read_only_fields = [
+            "workspace",
+            "project",
+            "page",
+        ]
+
+
+class PageFavoriteSerializer(BaseSerializer):
+    page_detail = PageSerializer(source="page", read_only=True)
+
+    class Meta:
+        model = PageFavorite
+        fields = "__all__"
+        read_only_fields = [
+            "workspace",
+            "project",
+            "user",
+        ]