We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Cascading Hints
Hints should have a sense of unlocking where one hint cannot be used until a previous one or others are used.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `CTFd/api/v1/hints.py`
Content:
```
1 from typing import List
2 
3 from flask import request
4 from flask_restx import Namespace, Resource
5 
6 from CTFd.api.v1.helpers.request import validate_args
7 from CTFd.api.v1.helpers.schemas import sqlalchemy_to_pydantic
8 from CTFd.api.v1.schemas import APIDetailedSuccessResponse, APIListSuccessResponse
9 from CTFd.constants import RawEnum
10 from CTFd.models import Hints, HintUnlocks, db
11 from CTFd.schemas.hints import HintSchema
12 from CTFd.utils.decorators import admins_only, authed_only, during_ctf_time_only
13 from CTFd.utils.helpers.models import build_model_filters
14 from CTFd.utils.user import get_current_user, is_admin
15 
16 hints_namespace = Namespace("hints", description="Endpoint to retrieve Hints")
17 
18 HintModel = sqlalchemy_to_pydantic(Hints)
19 
20 
21 class HintDetailedSuccessResponse(APIDetailedSuccessResponse):
22     data: HintModel
23 
24 
25 class HintListSuccessResponse(APIListSuccessResponse):
26     data: List[HintModel]
27 
28 
29 hints_namespace.schema_model(
30     "HintDetailedSuccessResponse", HintDetailedSuccessResponse.apidoc()
31 )
32 
33 hints_namespace.schema_model(
34     "HintListSuccessResponse", HintListSuccessResponse.apidoc()
35 )
36 
37 
38 @hints_namespace.route("")
39 class HintList(Resource):
40     @admins_only
41     @hints_namespace.doc(
42         description="Endpoint to list Hint objects in bulk",
43         responses={
44             200: ("Success", "HintListSuccessResponse"),
45             400: (
46                 "An error occured processing the provided or stored data",
47                 "APISimpleErrorResponse",
48             ),
49         },
50     )
51     @validate_args(
52         {
53             "type": (str, None),
54             "challenge_id": (int, None),
55             "content": (str, None),
56             "cost": (int, None),
57             "q": (str, None),
58             "field": (
59                 RawEnum("HintFields", {"type": "type", "content": "content"}),
60                 None,
61             ),
62         },
63         location="query",
64     )
65     def get(self, query_args):
66         q = query_args.pop("q", None)
67         field = str(query_args.pop("field", None))
68         filters = build_model_filters(model=Hints, query=q, field=field)
69 
70         hints = Hints.query.filter_by(**query_args).filter(*filters).all()
71         response = HintSchema(many=True, view="locked").dump(hints)
72 
73         if response.errors:
74             return {"success": False, "errors": response.errors}, 400
75 
76         return {"success": True, "data": response.data}
77 
78     @admins_only
79     @hints_namespace.doc(
80         description="Endpoint to create a Hint object",
81         responses={
82             200: ("Success", "HintDetailedSuccessResponse"),
83             400: (
84                 "An error occured processing the provided or stored data",
85                 "APISimpleErrorResponse",
86             ),
87         },
88     )
89     def post(self):
90         req = request.get_json()
91         schema = HintSchema(view="admin")
92         response = schema.load(req, session=db.session)
93 
94         if response.errors:
95             return {"success": False, "errors": response.errors}, 400
96 
97         db.session.add(response.data)
98         db.session.commit()
99 
100         response = schema.dump(response.data)
101 
102         return {"success": True, "data": response.data}
103 
104 
105 @hints_namespace.route("/<hint_id>")
106 class Hint(Resource):
107     @during_ctf_time_only
108     @authed_only
109     @hints_namespace.doc(
110         description="Endpoint to get a specific Hint object",
111         responses={
112             200: ("Success", "HintDetailedSuccessResponse"),
113             400: (
114                 "An error occured processing the provided or stored data",
115                 "APISimpleErrorResponse",
116             ),
117         },
118     )
119     def get(self, hint_id):
120         user = get_current_user()
121         hint = Hints.query.filter_by(id=hint_id).first_or_404()
122 
123         view = "unlocked"
124         if hint.cost:
125             view = "locked"
126             unlocked = HintUnlocks.query.filter_by(
127                 account_id=user.account_id, target=hint.id
128             ).first()
129             if unlocked:
130                 view = "unlocked"
131 
132         if is_admin():
133             if request.args.get("preview", False):
134                 view = "admin"
135 
136         response = HintSchema(view=view).dump(hint)
137 
138         if response.errors:
139             return {"success": False, "errors": response.errors}, 400
140 
141         return {"success": True, "data": response.data}
142 
143     @admins_only
144     @hints_namespace.doc(
145         description="Endpoint to edit a specific Hint object",
146         responses={
147             200: ("Success", "HintDetailedSuccessResponse"),
148             400: (
149                 "An error occured processing the provided or stored data",
150                 "APISimpleErrorResponse",
151             ),
152         },
153     )
154     def patch(self, hint_id):
155         hint = Hints.query.filter_by(id=hint_id).first_or_404()
156         req = request.get_json()
157 
158         schema = HintSchema(view="admin")
159         response = schema.load(req, instance=hint, partial=True, session=db.session)
160 
161         if response.errors:
162             return {"success": False, "errors": response.errors}, 400
163 
164         db.session.add(response.data)
165         db.session.commit()
166 
167         response = schema.dump(response.data)
168 
169         return {"success": True, "data": response.data}
170 
171     @admins_only
172     @hints_namespace.doc(
173         description="Endpoint to delete a specific Tag object",
174         responses={200: ("Success", "APISimpleSuccessResponse")},
175     )
176     def delete(self, hint_id):
177         hint = Hints.query.filter_by(id=hint_id).first_or_404()
178         db.session.delete(hint)
179         db.session.commit()
180         db.session.close()
181 
182         return {"success": True}
183
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/CTFd/api/v1/hints.py b/CTFd/api/v1/hints.py
--- a/CTFd/api/v1/hints.py
+++ b/CTFd/api/v1/hints.py
@@ -120,6 +120,33 @@
         user = get_current_user()
         hint = Hints.query.filter_by(id=hint_id).first_or_404()
 
+        if hint.requirements:
+            requirements = hint.requirements.get("prerequisites", [])
+
+            # Get the IDs of all hints that the user has unlocked
+            all_unlocks = HintUnlocks.query.filter_by(account_id=user.account_id).all()
+            unlock_ids = {unlock.id for unlock in all_unlocks}
+
+            # Filter out hint IDs that don't exist
+            all_hint_ids = {h.id for h in Hints.query.with_entities(Hints.id).all()}
+            prereqs = set(requirements).intersection(all_hint_ids)
+
+            # If the user has the necessary unlocks or is admin we should allow them to view
+            if unlock_ids >= prereqs or is_admin():
+                pass
+            else:
+                return (
+                    {
+                        "success": False,
+                        "errors": {
+                            "requirements": [
+                                "You must unlock other hints before accessing this hint"
+                            ]
+                        },
+                    },
+                    403,
+                )
+
         view = "unlocked"
         if hint.cost:
             view = "locked"

{"golden_diff": "diff --git a/CTFd/api/v1/hints.py b/CTFd/api/v1/hints.py\n--- a/CTFd/api/v1/hints.py\n+++ b/CTFd/api/v1/hints.py\n@@ -120,6 +120,33 @@\n         user = get_current_user()\n         hint = Hints.query.filter_by(id=hint_id).first_or_404()\n \n+        if hint.requirements:\n+            requirements = hint.requirements.get(\"prerequisites\", [])\n+\n+            # Get the IDs of all hints that the user has unlocked\n+            all_unlocks = HintUnlocks.query.filter_by(account_id=user.account_id).all()\n+            unlock_ids = {unlock.id for unlock in all_unlocks}\n+\n+            # Filter out hint IDs that don't exist\n+            all_hint_ids = {h.id for h in Hints.query.with_entities(Hints.id).all()}\n+            prereqs = set(requirements).intersection(all_hint_ids)\n+\n+            # If the user has the necessary unlocks or is admin we should allow them to view\n+            if unlock_ids >= prereqs or is_admin():\n+                pass\n+            else:\n+                return (\n+                    {\n+                        \"success\": False,\n+                        \"errors\": {\n+                            \"requirements\": [\n+                                \"You must unlock other hints before accessing this hint\"\n+                            ]\n+                        },\n+                    },\n+                    403,\n+                )\n+\n         view = \"unlocked\"\n         if hint.cost:\n             view = \"locked\"\n", "issue": "Cascading Hints\nHints should have a sense of unlocking where one hint cannot be used until a previous one or others are used.\n", "before_files": [{"content": "from typing import List\n\nfrom flask import request\nfrom flask_restx import Namespace, Resource\n\nfrom CTFd.api.v1.helpers.request import validate_args\nfrom CTFd.api.v1.helpers.schemas import sqlalchemy_to_pydantic\nfrom CTFd.api.v1.schemas import APIDetailedSuccessResponse, APIListSuccessResponse\nfrom CTFd.constants import RawEnum\nfrom CTFd.models import Hints, HintUnlocks, db\nfrom CTFd.schemas.hints import HintSchema\nfrom CTFd.utils.decorators import admins_only, authed_only, during_ctf_time_only\nfrom CTFd.utils.helpers.models import build_model_filters\nfrom CTFd.utils.user import get_current_user, is_admin\n\nhints_namespace = Namespace(\"hints\", description=\"Endpoint to retrieve Hints\")\n\nHintModel = sqlalchemy_to_pydantic(Hints)\n\n\nclass HintDetailedSuccessResponse(APIDetailedSuccessResponse):\n    data: HintModel\n\n\nclass HintListSuccessResponse(APIListSuccessResponse):\n    data: List[HintModel]\n\n\nhints_namespace.schema_model(\n    \"HintDetailedSuccessResponse\", HintDetailedSuccessResponse.apidoc()\n)\n\nhints_namespace.schema_model(\n    \"HintListSuccessResponse\", HintListSuccessResponse.apidoc()\n)\n\n\n@hints_namespace.route(\"\")\nclass HintList(Resource):\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to list Hint objects in bulk\",\n        responses={\n            200: (\"Success\", \"HintListSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    @validate_args(\n        {\n            \"type\": (str, None),\n            \"challenge_id\": (int, None),\n            \"content\": (str, None),\n            \"cost\": (int, None),\n            \"q\": (str, None),\n            \"field\": (\n                RawEnum(\"HintFields\", {\"type\": \"type\", \"content\": \"content\"}),\n                None,\n            ),\n        },\n        location=\"query\",\n    )\n    def get(self, query_args):\n        q = query_args.pop(\"q\", None)\n        field = str(query_args.pop(\"field\", None))\n        filters = build_model_filters(model=Hints, query=q, field=field)\n\n        hints = Hints.query.filter_by(**query_args).filter(*filters).all()\n        response = HintSchema(many=True, view=\"locked\").dump(hints)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to create a Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def post(self):\n        req = request.get_json()\n        schema = HintSchema(view=\"admin\")\n        response = schema.load(req, session=db.session)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        db.session.add(response.data)\n        db.session.commit()\n\n        response = schema.dump(response.data)\n\n        return {\"success\": True, \"data\": response.data}\n\n\n@hints_namespace.route(\"/<hint_id>\")\nclass Hint(Resource):\n    @during_ctf_time_only\n    @authed_only\n    @hints_namespace.doc(\n        description=\"Endpoint to get a specific Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def get(self, hint_id):\n        user = get_current_user()\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n\n        view = \"unlocked\"\n        if hint.cost:\n            view = \"locked\"\n            unlocked = HintUnlocks.query.filter_by(\n                account_id=user.account_id, target=hint.id\n            ).first()\n            if unlocked:\n                view = \"unlocked\"\n\n        if is_admin():\n            if request.args.get(\"preview\", False):\n                view = \"admin\"\n\n        response = HintSchema(view=view).dump(hint)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to edit a specific Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def patch(self, hint_id):\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n        req = request.get_json()\n\n        schema = HintSchema(view=\"admin\")\n        response = schema.load(req, instance=hint, partial=True, session=db.session)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        db.session.add(response.data)\n        db.session.commit()\n\n        response = schema.dump(response.data)\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to delete a specific Tag object\",\n        responses={200: (\"Success\", \"APISimpleSuccessResponse\")},\n    )\n    def delete(self, hint_id):\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n        db.session.delete(hint)\n        db.session.commit()\n        db.session.close()\n\n        return {\"success\": True}\n", "path": "CTFd/api/v1/hints.py"}], "after_files": [{"content": "from typing import List\n\nfrom flask import request\nfrom flask_restx import Namespace, Resource\n\nfrom CTFd.api.v1.helpers.request import validate_args\nfrom CTFd.api.v1.helpers.schemas import sqlalchemy_to_pydantic\nfrom CTFd.api.v1.schemas import APIDetailedSuccessResponse, APIListSuccessResponse\nfrom CTFd.constants import RawEnum\nfrom CTFd.models import Hints, HintUnlocks, db\nfrom CTFd.schemas.hints import HintSchema\nfrom CTFd.utils.decorators import admins_only, authed_only, during_ctf_time_only\nfrom CTFd.utils.helpers.models import build_model_filters\nfrom CTFd.utils.user import get_current_user, is_admin\n\nhints_namespace = Namespace(\"hints\", description=\"Endpoint to retrieve Hints\")\n\nHintModel = sqlalchemy_to_pydantic(Hints)\n\n\nclass HintDetailedSuccessResponse(APIDetailedSuccessResponse):\n    data: HintModel\n\n\nclass HintListSuccessResponse(APIListSuccessResponse):\n    data: List[HintModel]\n\n\nhints_namespace.schema_model(\n    \"HintDetailedSuccessResponse\", HintDetailedSuccessResponse.apidoc()\n)\n\nhints_namespace.schema_model(\n    \"HintListSuccessResponse\", HintListSuccessResponse.apidoc()\n)\n\n\n@hints_namespace.route(\"\")\nclass HintList(Resource):\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to list Hint objects in bulk\",\n        responses={\n            200: (\"Success\", \"HintListSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    @validate_args(\n        {\n            \"type\": (str, None),\n            \"challenge_id\": (int, None),\n            \"content\": (str, None),\n            \"cost\": (int, None),\n            \"q\": (str, None),\n            \"field\": (\n                RawEnum(\"HintFields\", {\"type\": \"type\", \"content\": \"content\"}),\n                None,\n            ),\n        },\n        location=\"query\",\n    )\n    def get(self, query_args):\n        q = query_args.pop(\"q\", None)\n        field = str(query_args.pop(\"field\", None))\n        filters = build_model_filters(model=Hints, query=q, field=field)\n\n        hints = Hints.query.filter_by(**query_args).filter(*filters).all()\n        response = HintSchema(many=True, view=\"locked\").dump(hints)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to create a Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def post(self):\n        req = request.get_json()\n        schema = HintSchema(view=\"admin\")\n        response = schema.load(req, session=db.session)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        db.session.add(response.data)\n        db.session.commit()\n\n        response = schema.dump(response.data)\n\n        return {\"success\": True, \"data\": response.data}\n\n\n@hints_namespace.route(\"/<hint_id>\")\nclass Hint(Resource):\n    @during_ctf_time_only\n    @authed_only\n    @hints_namespace.doc(\n        description=\"Endpoint to get a specific Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def get(self, hint_id):\n        user = get_current_user()\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n\n        if hint.requirements:\n            requirements = hint.requirements.get(\"prerequisites\", [])\n\n            # Get the IDs of all hints that the user has unlocked\n            all_unlocks = HintUnlocks.query.filter_by(account_id=user.account_id).all()\n            unlock_ids = {unlock.id for unlock in all_unlocks}\n\n            # Filter out hint IDs that don't exist\n            all_hint_ids = {h.id for h in Hints.query.with_entities(Hints.id).all()}\n            prereqs = set(requirements).intersection(all_hint_ids)\n\n            # If the user has the necessary unlocks or is admin we should allow them to view\n            if unlock_ids >= prereqs or is_admin():\n                pass\n            else:\n                return (\n                    {\n                        \"success\": False,\n                        \"errors\": {\n                            \"requirements\": [\n                                \"You must unlock other hints before accessing this hint\"\n                            ]\n                        },\n                    },\n                    403,\n                )\n\n        view = \"unlocked\"\n        if hint.cost:\n            view = \"locked\"\n            unlocked = HintUnlocks.query.filter_by(\n                account_id=user.account_id, target=hint.id\n            ).first()\n            if unlocked:\n                view = \"unlocked\"\n\n        if is_admin():\n            if request.args.get(\"preview\", False):\n                view = \"admin\"\n\n        response = HintSchema(view=view).dump(hint)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to edit a specific Hint object\",\n        responses={\n            200: (\"Success\", \"HintDetailedSuccessResponse\"),\n            400: (\n                \"An error occured processing the provided or stored data\",\n                \"APISimpleErrorResponse\",\n            ),\n        },\n    )\n    def patch(self, hint_id):\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n        req = request.get_json()\n\n        schema = HintSchema(view=\"admin\")\n        response = schema.load(req, instance=hint, partial=True, session=db.session)\n\n        if response.errors:\n            return {\"success\": False, \"errors\": response.errors}, 400\n\n        db.session.add(response.data)\n        db.session.commit()\n\n        response = schema.dump(response.data)\n\n        return {\"success\": True, \"data\": response.data}\n\n    @admins_only\n    @hints_namespace.doc(\n        description=\"Endpoint to delete a specific Tag object\",\n        responses={200: (\"Success\", \"APISimpleSuccessResponse\")},\n    )\n    def delete(self, hint_id):\n        hint = Hints.query.filter_by(id=hint_id).first_or_404()\n        db.session.delete(hint)\n        db.session.commit()\n        db.session.close()\n\n        return {\"success\": True}\n", "path": "CTFd/api/v1/hints.py"}]}