prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Annotation answers get parsed incorrectly in csv export
  For annotation type answers, the csv export looks like this currently:
  ![Screenshot from 2021-02-18 16-26-04](https://user-images.githubusercontent.com/57257130/108379339-1b666e00-7206-11eb-8adf-629acca14f74.png)
  
  It appears the annotation json gets part as part of the export. We should probably add some escaping.
  
  </issue>
  <code>
  [start of app/grandchallenge/core/renderers.py]
  1 from rest_framework_csv.renderers import CSVRenderer
  2 
  3 
  4 class PaginatedCSVRenderer(CSVRenderer):
  5     results_field = "results"
  6 
  7     def render(self, data, *args, **kwargs):
  8         if self.results_field in data:
  9             data = data[self.results_field]
  10 
  11         return super().render(data, *args, **kwargs)
  12
  [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
  @@ -1,3 +1,5 @@
  +import json
  +
   from rest_framework_csv.renderers import CSVRenderer
   
   
  @@ -9,3 +11,19 @@
               data = data[self.results_field]
   
           return super().render(data, *args, **kwargs)
  +
  +    def flatten_data(self, data):
  +        """
  +        Create a dictionary that is 1 level deep, with nested values serialized
  +        as json. This means that the header rows are now consistent.
  +        """
  +        for row in data:
  +            flat_row = {k: self._flatten_value(v) for k, v in row.items()}
  +            yield flat_row
  +
  +    @staticmethod
  +    def _flatten_value(value):
  +        if isinstance(value, (dict, list)):
  +            return json.dumps(value)
  +        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@@ -1,3 +1,5 @@\n+import json\n+\n from rest_framework_csv.renderers import CSVRenderer\n \n \n@@ -9,3 +11,19 @@\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", "issue": "Annotation answers get parsed incorrectly in csv export\nFor annotation type answers, the csv export looks like this currently:\r\n![Screenshot from 2021-02-18 16-26-04](https://user-images.githubusercontent.com/57257130/108379339-1b666e00-7206-11eb-8adf-629acca14f74.png)\r\n\r\nIt appears the annotation json gets part as part of the export. We should probably add some escaping.\n", "before_files": [{"content": "from 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", "path": "app/grandchallenge/core/renderers.py"}]}