prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  CSV export fails on converting uuid to json
  Problematic JSON structure in https://grand-challenge.org/api/v1/cases/images/redacted_uuid/?format=csv
  
  ```
  {"pk":"redacted_uuid","name":"redacted.png","study":null,"files":[{"pk":"redacted_uuid","image":"redacted_uuid","file":"https://grand-challenge.org/media/images/...mhd","image_type":"MHD"},{"pk":"redacted_uuid","image":"09b3b3d6-0994-43d2-b6a9-eaff634b8805","file":"https://grand-challenge.org/media/images/...zraw","image_type":"MHD"}],"reader_study_set":["https://grand-challenge.org/api/v1/reader-studies/redacted_uuid/","https://grand-challenge.org/api/v1/reader-studies/redacted_uuid/"],"archive_set":[],"job_set":[],"width":596,"height":596,"depth":null,"color_space":"RGB","modality":null,"eye_choice":"NA","stereoscopic_choice":null,"field_of_view":null,"shape_without_color":[596,596],"shape":[596,596,3],"voxel_width_mm":null,"voxel_height_mm":null,"voxel_depth_mm":null,"api_url":"https://grand-challenge.org/api/v1/cases/images/redacted_uuid/"}
  ```
  
  Probably due to trying to serialize the list of files to json in https://github.com/comic/grand-challenge.org/blob/14bc3dd4002756e9cf4a32bb0f238859a9175252/app/grandchallenge/core/renderers.py#L26-L27
  
  </issue>
  <code>
  [start of app/grandchallenge/core/renderers.py]
  1 import json
  2 
  3 from rest_framework_csv.renderers import CSVRenderer
  4 
  5 
  6 class PaginatedCSVRenderer(CSVRenderer):
  7     results_field = "results"
  8 
  9     def render(self, data, *args, **kwargs):
  10         if self.results_field in data:
  11             data = data[self.results_field]
  12 
  13         return super().render(data, *args, **kwargs)
  14 
  15     def flatten_data(self, data):
  16         """
  17         Create a dictionary that is 1 level deep, with nested values serialized
  18         as json. This means that the header rows are now consistent.
  19         """
  20         for row in data:
  21             flat_row = {k: self._flatten_value(v) for k, v in row.items()}
  22             yield flat_row
  23 
  24     @staticmethod
  25     def _flatten_value(value):
  26         if isinstance(value, (dict, list)):
  27             return json.dumps(value)
  28         else:
  29             return value
  30
  [end of app/grandchallenge/core/renderers.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/app/grandchallenge/core/renderers.py b/app/grandchallenge/core/renderers.py
  --- a/app/grandchallenge/core/renderers.py
  +++ b/app/grandchallenge/core/renderers.py
  @@ -1,5 +1,7 @@
   import json
   
  +from rest_framework.settings import api_settings
  +from rest_framework.utils.encoders import JSONEncoder
   from rest_framework_csv.renderers import CSVRenderer
   
   
  @@ -24,6 +26,11 @@
       @staticmethod
       def _flatten_value(value):
           if isinstance(value, (dict, list)):
  -            return json.dumps(value)
  +            return json.dumps(
  +                value,
  +                cls=JSONEncoder,
  +                ensure_ascii=not api_settings.UNICODE_JSON,
  +                allow_nan=not api_settings.STRICT_JSON,
  +            )
           else:
               return value
  
verification_info: {"golden_diff": "diff --git a/app/grandchallenge/core/renderers.py b/app/grandchallenge/core/renderers.py\n--- a/app/grandchallenge/core/renderers.py\n+++ b/app/grandchallenge/core/renderers.py\n@@ -1,5 +1,7 @@\n import json\n \n+from rest_framework.settings import api_settings\n+from rest_framework.utils.encoders import JSONEncoder\n from rest_framework_csv.renderers import CSVRenderer\n \n \n@@ -24,6 +26,11 @@\n     @staticmethod\n     def _flatten_value(value):\n         if isinstance(value, (dict, list)):\n-            return json.dumps(value)\n+            return json.dumps(\n+                value,\n+                cls=JSONEncoder,\n+                ensure_ascii=not api_settings.UNICODE_JSON,\n+                allow_nan=not api_settings.STRICT_JSON,\n+            )\n         else:\n             return value\n", "issue": "CSV export fails on converting uuid to json\nProblematic JSON structure in https://grand-challenge.org/api/v1/cases/images/redacted_uuid/?format=csv\r\n\r\n```\r\n{\"pk\":\"redacted_uuid\",\"name\":\"redacted.png\",\"study\":null,\"files\":[{\"pk\":\"redacted_uuid\",\"image\":\"redacted_uuid\",\"file\":\"https://grand-challenge.org/media/images/...mhd\",\"image_type\":\"MHD\"},{\"pk\":\"redacted_uuid\",\"image\":\"09b3b3d6-0994-43d2-b6a9-eaff634b8805\",\"file\":\"https://grand-challenge.org/media/images/...zraw\",\"image_type\":\"MHD\"}],\"reader_study_set\":[\"https://grand-challenge.org/api/v1/reader-studies/redacted_uuid/\",\"https://grand-challenge.org/api/v1/reader-studies/redacted_uuid/\"],\"archive_set\":[],\"job_set\":[],\"width\":596,\"height\":596,\"depth\":null,\"color_space\":\"RGB\",\"modality\":null,\"eye_choice\":\"NA\",\"stereoscopic_choice\":null,\"field_of_view\":null,\"shape_without_color\":[596,596],\"shape\":[596,596,3],\"voxel_width_mm\":null,\"voxel_height_mm\":null,\"voxel_depth_mm\":null,\"api_url\":\"https://grand-challenge.org/api/v1/cases/images/redacted_uuid/\"}\r\n```\r\n\r\nProbably due to trying to serialize the list of files to json in https://github.com/comic/grand-challenge.org/blob/14bc3dd4002756e9cf4a32bb0f238859a9175252/app/grandchallenge/core/renderers.py#L26-L27\n", "before_files": [{"content": "import json\n\nfrom rest_framework_csv.renderers import CSVRenderer\n\n\nclass PaginatedCSVRenderer(CSVRenderer):\n    results_field = \"results\"\n\n    def render(self, data, *args, **kwargs):\n        if self.results_field in data:\n            data = data[self.results_field]\n\n        return super().render(data, *args, **kwargs)\n\n    def flatten_data(self, data):\n        \"\"\"\n        Create a dictionary that is 1 level deep, with nested values serialized\n        as json. This means that the header rows are now consistent.\n        \"\"\"\n        for row in data:\n            flat_row = {k: self._flatten_value(v) for k, v in row.items()}\n            yield flat_row\n\n    @staticmethod\n    def _flatten_value(value):\n        if isinstance(value, (dict, list)):\n            return json.dumps(value)\n        else:\n            return value\n", "path": "app/grandchallenge/core/renderers.py"}]}