prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Use Generic Relation everywhere where generic fks are used
  
  
  </issue>
  <code>
  [start of euth/documents/serializers.py]
  1 from rest_framework import serializers
  2 
  3 from .models import Document, Paragraph
  4 
  5 
  6 class ParagraphSerializer(serializers.Serializer):
  7     id = serializers.IntegerField(required=False)
  8     name = serializers.CharField(
  9         required=False,
  10         max_length=Paragraph._meta.get_field('name').max_length
  11     )
  12     weight = serializers.IntegerField()
  13     text = serializers.CharField()
  14 
  15 
  16 class DocumentSerializer(serializers.ModelSerializer):
  17     paragraphs = ParagraphSerializer(many=True, partial=True)
  18 
  19     class Meta:
  20         model = Document
  21         exclude = ('creator',)
  22 
  23     def create(self, validated_data):
  24         paragraphs = validated_data.pop('paragraphs')
  25         user = self.context['request'].user
  26         document = Document.objects.create(creator=user, **validated_data)
  27 
  28         for paragraph in paragraphs:
  29             Paragraph.objects.create(document=document, **paragraph)
  30 
  31         return document
  32 
  33     def update(self, instance, validated_data):
  34         instance.name = validated_data['name']
  35         instance.save()
  36         paragraphs = validated_data.pop('paragraphs')
  37 
  38         paragraph_ids = [item['id'] for item in paragraphs if 'id' in item]
  39         instance.paragraphs.exclude(id__in=paragraph_ids).delete()
  40 
  41         for paragraph in paragraphs:
  42             paragraph['document'] = instance
  43             if 'id' in paragraph:
  44                 instance.paragraphs.filter(id=paragraph['id'])\
  45                                    .update(**paragraph)
  46             else:
  47                 instance.paragraphs.create(**paragraph)
  48 
  49         return instance
  50
  [end of euth/documents/serializers.py]
  [start of euth/documents/models.py]
  1 from ckeditor.fields import RichTextField
  2 from django.contrib.contenttypes.models import ContentType
  3 from django.core.exceptions import ObjectDoesNotExist, ValidationError
  4 from django.db import models
  5 from django.utils.functional import cached_property
  6 from django.utils.translation import ugettext_lazy as _
  7 
  8 from contrib.transforms import html_transforms
  9 from euth.comments import models as comment_models
  10 from euth.contrib import base_models
  11 from euth.modules import models as module_models
  12 
  13 
  14 class Document(module_models.Item):
  15     name = models.CharField(max_length=120)
  16 
  17     def __str__(self):
  18         return "{}_document_{}".format(str(self.module), self.pk)
  19 
  20     def clean(self, *args, **kwargs):
  21         if not self.pk:
  22             try:
  23                 Document.objects.get(module=self.module)
  24                 raise ValidationError(
  25                     _('Document for that module already exists'))
  26             except ObjectDoesNotExist:
  27                 super().clean(*args, **kwargs)
  28         super().clean(*args, **kwargs)
  29 
  30     @cached_property
  31     def paragraphs_sorted(self):
  32         return self.paragraphs.all().order_by('weight')
  33 
  34     @cached_property
  35     def comments(self):
  36         contenttype = ContentType.objects.get_for_model(self)
  37         pk = self.id
  38         comments = comment_models.Comment.objects.all().filter(
  39             content_type=contenttype, object_pk=pk)
  40         return comments
  41 
  42 
  43 class Paragraph(base_models.TimeStampedModel):
  44     name = models.CharField(max_length=120, blank=True)
  45     text = RichTextField()
  46     weight = models.PositiveIntegerField()
  47     document = models.ForeignKey(Document,
  48                                  on_delete=models.CASCADE,
  49                                  related_name='paragraphs')
  50 
  51     class Meta:
  52         ordering = ('weight',)
  53 
  54     def __str__(self):
  55         return "{}_paragraph_{}".format(str(self.document), self.weight)
  56 
  57     def save(self, *args, **kwargs):
  58         self.text = html_transforms.clean_html_field(
  59             self.text)
  60         super().save(*args, **kwargs)
  61 
  62     @cached_property
  63     def comments(self):
  64         contenttype = ContentType.objects.get_for_model(self)
  65         pk = self.id
  66         comments = comment_models.Comment.objects.all().filter(
  67             content_type=contenttype, object_pk=pk)
  68         return comments
  69 
  70     @cached_property
  71     def project(self):
  72         return self.document.project
  73
  [end of euth/documents/models.py]
  [start of euth/documents/phases.py]
  1 from django.utils.translation import ugettext_lazy as _
  2 
  3 from euth import phases
  4 
  5 from . import apps, models, views
  6 
  7 
  8 class CreateDocumentPhase(phases.PhaseContent):
  9     """
  10     Allows no interaction for participants, only
  11     creation for moderators.
  12     """
  13     app = apps.DocumentConfig.label
  14     phase = 'create_document'
  15     view = views.DocumentCreateView
  16     weight = 30
  17 
  18     name = _('Create document phase')
  19     module_name = _('commenting text')
  20     description = _('Create text for the project.')
  21 
  22     features = {}
  23 
  24 
  25 phases.content.register(CreateDocumentPhase())
  26 
  27 
  28 class CommentPhase(phases.PhaseContent):
  29     """
  30     Allows only commenting of paragraphs.
  31     """
  32     app = apps.DocumentConfig.label
  33     phase = 'comment'
  34     view = views.DocumentDetailView
  35     weight = 40
  36 
  37     name = _('Comment phase')
  38     module_name = _('commenting text')
  39     description = _('Collect comments for the text.')
  40 
  41     features = {
  42         'comment': (models.Paragraph,),
  43     }
  44 
  45 
  46 phases.content.register(CommentPhase())
  47
  [end of euth/documents/phases.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/euth/documents/models.py b/euth/documents/models.py
  --- a/euth/documents/models.py
  +++ b/euth/documents/models.py
  @@ -1,5 +1,5 @@
   from ckeditor.fields import RichTextField
  -from django.contrib.contenttypes.models import ContentType
  +from django.contrib.contenttypes.fields import GenericRelation
   from django.core.exceptions import ObjectDoesNotExist, ValidationError
   from django.db import models
   from django.utils.functional import cached_property
  @@ -27,18 +27,6 @@
                   super().clean(*args, **kwargs)
           super().clean(*args, **kwargs)
   
  -    @cached_property
  -    def paragraphs_sorted(self):
  -        return self.paragraphs.all().order_by('weight')
  -
  -    @cached_property
  -    def comments(self):
  -        contenttype = ContentType.objects.get_for_model(self)
  -        pk = self.id
  -        comments = comment_models.Comment.objects.all().filter(
  -            content_type=contenttype, object_pk=pk)
  -        return comments
  -
   
   class Paragraph(base_models.TimeStampedModel):
       name = models.CharField(max_length=120, blank=True)
  @@ -47,6 +35,9 @@
       document = models.ForeignKey(Document,
                                    on_delete=models.CASCADE,
                                    related_name='paragraphs')
  +    comments = GenericRelation(comment_models.Comment,
  +                               related_query_name='paragraph',
  +                               object_id_field='object_pk')
   
       class Meta:
           ordering = ('weight',)
  @@ -59,14 +50,6 @@
               self.text)
           super().save(*args, **kwargs)
   
  -    @cached_property
  -    def comments(self):
  -        contenttype = ContentType.objects.get_for_model(self)
  -        pk = self.id
  -        comments = comment_models.Comment.objects.all().filter(
  -            content_type=contenttype, object_pk=pk)
  -        return comments
  -
       @cached_property
       def project(self):
           return self.document.project
  diff --git a/euth/documents/phases.py b/euth/documents/phases.py
  --- a/euth/documents/phases.py
  +++ b/euth/documents/phases.py
  @@ -39,7 +39,7 @@
       description = _('Collect comments for the text.')
   
       features = {
  -        'comment': (models.Paragraph,),
  +        'comment': (models.Paragraph, models.Document),
       }
   
   
  diff --git a/euth/documents/serializers.py b/euth/documents/serializers.py
  --- a/euth/documents/serializers.py
  +++ b/euth/documents/serializers.py
  @@ -7,6 +7,7 @@
       id = serializers.IntegerField(required=False)
       name = serializers.CharField(
           required=False,
  +        allow_blank=True,
           max_length=Paragraph._meta.get_field('name').max_length
       )
       weight = serializers.IntegerField()
  
verification_info: {"golden_diff": "diff --git a/euth/documents/models.py b/euth/documents/models.py\n--- a/euth/documents/models.py\n+++ b/euth/documents/models.py\n@@ -1,5 +1,5 @@\n from ckeditor.fields import RichTextField\n-from django.contrib.contenttypes.models import ContentType\n+from django.contrib.contenttypes.fields import GenericRelation\n from django.core.exceptions import ObjectDoesNotExist, ValidationError\n from django.db import models\n from django.utils.functional import cached_property\n@@ -27,18 +27,6 @@\n                 super().clean(*args, **kwargs)\n         super().clean(*args, **kwargs)\n \n-    @cached_property\n-    def paragraphs_sorted(self):\n-        return self.paragraphs.all().order_by('weight')\n-\n-    @cached_property\n-    def comments(self):\n-        contenttype = ContentType.objects.get_for_model(self)\n-        pk = self.id\n-        comments = comment_models.Comment.objects.all().filter(\n-            content_type=contenttype, object_pk=pk)\n-        return comments\n-\n \n class Paragraph(base_models.TimeStampedModel):\n     name = models.CharField(max_length=120, blank=True)\n@@ -47,6 +35,9 @@\n     document = models.ForeignKey(Document,\n                                  on_delete=models.CASCADE,\n                                  related_name='paragraphs')\n+    comments = GenericRelation(comment_models.Comment,\n+                               related_query_name='paragraph',\n+                               object_id_field='object_pk')\n \n     class Meta:\n         ordering = ('weight',)\n@@ -59,14 +50,6 @@\n             self.text)\n         super().save(*args, **kwargs)\n \n-    @cached_property\n-    def comments(self):\n-        contenttype = ContentType.objects.get_for_model(self)\n-        pk = self.id\n-        comments = comment_models.Comment.objects.all().filter(\n-            content_type=contenttype, object_pk=pk)\n-        return comments\n-\n     @cached_property\n     def project(self):\n         return self.document.project\ndiff --git a/euth/documents/phases.py b/euth/documents/phases.py\n--- a/euth/documents/phases.py\n+++ b/euth/documents/phases.py\n@@ -39,7 +39,7 @@\n     description = _('Collect comments for the text.')\n \n     features = {\n-        'comment': (models.Paragraph,),\n+        'comment': (models.Paragraph, models.Document),\n     }\n \n \ndiff --git a/euth/documents/serializers.py b/euth/documents/serializers.py\n--- a/euth/documents/serializers.py\n+++ b/euth/documents/serializers.py\n@@ -7,6 +7,7 @@\n     id = serializers.IntegerField(required=False)\n     name = serializers.CharField(\n         required=False,\n+        allow_blank=True,\n         max_length=Paragraph._meta.get_field('name').max_length\n     )\n     weight = serializers.IntegerField()\n", "issue": "Use Generic Relation everywhere where generic fks are used\n\n", "before_files": [{"content": "from rest_framework import serializers\n\nfrom .models import Document, Paragraph\n\n\nclass ParagraphSerializer(serializers.Serializer):\n    id = serializers.IntegerField(required=False)\n    name = serializers.CharField(\n        required=False,\n        max_length=Paragraph._meta.get_field('name').max_length\n    )\n    weight = serializers.IntegerField()\n    text = serializers.CharField()\n\n\nclass DocumentSerializer(serializers.ModelSerializer):\n    paragraphs = ParagraphSerializer(many=True, partial=True)\n\n    class Meta:\n        model = Document\n        exclude = ('creator',)\n\n    def create(self, validated_data):\n        paragraphs = validated_data.pop('paragraphs')\n        user = self.context['request'].user\n        document = Document.objects.create(creator=user, **validated_data)\n\n        for paragraph in paragraphs:\n            Paragraph.objects.create(document=document, **paragraph)\n\n        return document\n\n    def update(self, instance, validated_data):\n        instance.name = validated_data['name']\n        instance.save()\n        paragraphs = validated_data.pop('paragraphs')\n\n        paragraph_ids = [item['id'] for item in paragraphs if 'id' in item]\n        instance.paragraphs.exclude(id__in=paragraph_ids).delete()\n\n        for paragraph in paragraphs:\n            paragraph['document'] = instance\n            if 'id' in paragraph:\n                instance.paragraphs.filter(id=paragraph['id'])\\\n                                   .update(**paragraph)\n            else:\n                instance.paragraphs.create(**paragraph)\n\n        return instance\n", "path": "euth/documents/serializers.py"}, {"content": "from ckeditor.fields import RichTextField\nfrom django.contrib.contenttypes.models import ContentType\nfrom django.core.exceptions import ObjectDoesNotExist, ValidationError\nfrom django.db import models\nfrom django.utils.functional import cached_property\nfrom django.utils.translation import ugettext_lazy as _\n\nfrom contrib.transforms import html_transforms\nfrom euth.comments import models as comment_models\nfrom euth.contrib import base_models\nfrom euth.modules import models as module_models\n\n\nclass Document(module_models.Item):\n    name = models.CharField(max_length=120)\n\n    def __str__(self):\n        return \"{}_document_{}\".format(str(self.module), self.pk)\n\n    def clean(self, *args, **kwargs):\n        if not self.pk:\n            try:\n                Document.objects.get(module=self.module)\n                raise ValidationError(\n                    _('Document for that module already exists'))\n            except ObjectDoesNotExist:\n                super().clean(*args, **kwargs)\n        super().clean(*args, **kwargs)\n\n    @cached_property\n    def paragraphs_sorted(self):\n        return self.paragraphs.all().order_by('weight')\n\n    @cached_property\n    def comments(self):\n        contenttype = ContentType.objects.get_for_model(self)\n        pk = self.id\n        comments = comment_models.Comment.objects.all().filter(\n            content_type=contenttype, object_pk=pk)\n        return comments\n\n\nclass Paragraph(base_models.TimeStampedModel):\n    name = models.CharField(max_length=120, blank=True)\n    text = RichTextField()\n    weight = models.PositiveIntegerField()\n    document = models.ForeignKey(Document,\n                                 on_delete=models.CASCADE,\n                                 related_name='paragraphs')\n\n    class Meta:\n        ordering = ('weight',)\n\n    def __str__(self):\n        return \"{}_paragraph_{}\".format(str(self.document), self.weight)\n\n    def save(self, *args, **kwargs):\n        self.text = html_transforms.clean_html_field(\n            self.text)\n        super().save(*args, **kwargs)\n\n    @cached_property\n    def comments(self):\n        contenttype = ContentType.objects.get_for_model(self)\n        pk = self.id\n        comments = comment_models.Comment.objects.all().filter(\n            content_type=contenttype, object_pk=pk)\n        return comments\n\n    @cached_property\n    def project(self):\n        return self.document.project\n", "path": "euth/documents/models.py"}, {"content": "from django.utils.translation import ugettext_lazy as _\n\nfrom euth import phases\n\nfrom . import apps, models, views\n\n\nclass CreateDocumentPhase(phases.PhaseContent):\n    \"\"\"\n    Allows no interaction for participants, only\n    creation for moderators.\n    \"\"\"\n    app = apps.DocumentConfig.label\n    phase = 'create_document'\n    view = views.DocumentCreateView\n    weight = 30\n\n    name = _('Create document phase')\n    module_name = _('commenting text')\n    description = _('Create text for the project.')\n\n    features = {}\n\n\nphases.content.register(CreateDocumentPhase())\n\n\nclass CommentPhase(phases.PhaseContent):\n    \"\"\"\n    Allows only commenting of paragraphs.\n    \"\"\"\n    app = apps.DocumentConfig.label\n    phase = 'comment'\n    view = views.DocumentDetailView\n    weight = 40\n\n    name = _('Comment phase')\n    module_name = _('commenting text')\n    description = _('Collect comments for the text.')\n\n    features = {\n        'comment': (models.Paragraph,),\n    }\n\n\nphases.content.register(CommentPhase())\n", "path": "euth/documents/phases.py"}]}