Convert page numbers to strings when JSON encoding

JSON doesn't have an int data type - it's either floats or strings.
We're never doing any maths with page numbers so strings make more sense.

backend/models/recipe.py

@@ -34,7 +34,7 @@ class Book(Source):
     type: SourceType = SourceType.BOOK
 
     def to_dict(self) -> Dict[str, str]:
-        return {"type": self.type.value, "title": self.title, "page": self.page}
+        return {"type": self.type.value, "title": self.title, "page": str(self.page)}
 
 
 class Recipe:
@@ -87,7 +87,7 @@ def _source_from_dict(cls, input: Dict[str, Any]) -> Source:
             elif input["type"] == "website":
                 return Website(address=input["address"])
             elif input["type"] == "book":
-                return Book(title=input["title"], page=input["page"])
+                return Book(title=input["title"], page=int(input["page"]))
             else:
                 raise ValueError("Provided type is not recognised")
 

backend/tests/fixtures.py

@@ -9,7 +9,7 @@
 API_GATEWAY_PROXY_EVENT_V2 = APIGatewayProxyEventV2({"body": json.dumps({})})
 
 SOURCE_WEBSITE_DICT = {"type": "website", "address": "address"}
-SOURCE_BOOK_DICT = {"type": "book", "page": 1, "title": "title"}
+SOURCE_BOOK_DICT = {"type": "book", "page": "1", "title": "title"}
 
 RECIPE_DICT = {
     "id": "id",

backend/tests/models/test_recipe.py

@@ -66,7 +66,7 @@ def test_book_source_from_dict(self):
         assert isinstance(source, Book)
         assert source.type == SourceType.BOOK
         assert source.title == SOURCE_BOOK_DICT["title"]
-        assert source.page == SOURCE_BOOK_DICT["page"]
+        assert source.page == int(SOURCE_BOOK_DICT["page"])
 
     def test_source_from_dict_raises_when_type_missing(self):
         bad_source = deepcopy(SOURCE_WEBSITE_DICT)