Bug with simple tree structure

[creyD]

I implemented basically the exact recursive model and RecursiveModelSerializer and Django throws maximum recursion depth exceeded while calling a Python object which is interesting, because we only have one parent relation in the database with only 3 objects.

class UnitSerializer(serializers.ModelSerializer):
    parent = RecursiveField(allow_null=False)
    address = AddressSerializer(read_only=True)
    type = serializers.StringRelatedField(read_only=True)
    properties = PropertySerializer(many=True, read_only=True)

    class Meta:
        fields = ('id', 'name', 'description', 'enabled', 'parent', 'type', 'address', 'properties')
        model = Unit
        depth = 3

is our serializer class and it doesn't work. I am using the latest Django 3.0.7 and DRF 3.11.0.

[heywbj]

It means your tree structure contains a cycle.

[creyD]

But it doesn't, it's just 3 Objects and one is the parent of another. The third has no relationship.

[heywbj]

Can you provide the stack trace

On Sun, Jul 12, 2020, 15:36 Conrad [email protected] wrote:

But it doesn't, it's just 3 Objects and one is the parent of another. The third has no relationship.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/heywbj/django-rest-framework-recursive/issues/32#issuecomment-657285397, or unsubscribe https://github.com/notifications/unsubscribe-auth/AARAEUL4OAVPGLPG4ZFHBSLR3I3FZANCNFSM4OT4CCXA .

[creyD]

Yeah sure:

Request Method: GET
Request URL: http://127.0.0.1:8000/api/unit

Django Version: 3.0.7
Python Version: 3.7.3
Installed Applications:
['backend',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'rest_framework',
 'drf_yasg',
 'corsheaders']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'corsheaders.middleware.CorsMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware']



Traceback (most recent call last):
  File "PROJECTPATH/.env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/django/core/handlers/base.py", line 145, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/django/core/handlers/base.py", line 143, in _get_response
    response = response.render()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/django/template/response.py", line 105, in render
    self.content = self.rendered_content
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/response.py", line 70, in rendered_content
    ret = renderer.render(self.data, accepted_media_type, context)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/renderers.py", line 724, in render
    context = self.get_context(data, accepted_media_type, renderer_context)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/renderers.py", line 655, in get_context
    raw_data_post_form = self.get_raw_data_form(data, view, 'POST', request)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/renderers.py", line 563, in get_raw_data_form
    data = serializer.data.copy()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 562, in data
    ret = super().data
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 264, in data
    self._data = self.get_initial()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
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  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 413, in <listcomp>
    if not field.read_only
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 412, in get_initial
    for field in self.fields.values()
  File "PROJECTPATH/.env/lib/python3.7/site-packages/django/utils/functional.py", line 48, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 363, in fields
    for key, value in self.get_fields().items():
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/serializers.py", line 1028, in get_fields
    declared_fields = copy.deepcopy(self._declared_fields)
  File "PROJECTPATH/.env/lib/python3.7/copy.py", line 180, in deepcopy
    y = _reconstruct(x, memo, *rv)
  File "PROJECTPATH/.env/lib/python3.7/copy.py", line 306, in _reconstruct
    value = deepcopy(value, memo)
  File "PROJECTPATH/.env/lib/python3.7/copy.py", line 161, in deepcopy
    y = copier(memo)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework/fields.py", line 683, in __deepcopy__
    return self.__class__(*args, **kwargs)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework_recursive/fields.py", line 72, in __init__
    for key in kwargs
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework_recursive/fields.py", line 73, in <genexpr>
    if key in _signature_parameters(Field.__init__)
  File "PROJECTPATH/.env/lib/python3.7/site-packages/rest_framework_recursive/fields.py", line 15, in _signature_parameters
    return inspect.signature(func).parameters.keys()
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/inspect.py", line 3083, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/inspect.py", line 2833, in from_callable
    follow_wrapper_chains=follow_wrapped)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/inspect.py", line 2284, in _signature_from_callable
    return _signature_from_function(sigcls, obj)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/inspect.py", line 2154, in _signature_from_function
    kind=_POSITIONAL_OR_KEYWORD))
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/inspect.py", line 2469, in __init__
    self._kind = _ParameterKind(kind)
  File "PROJECTPATH/.env/lib/python3.7/enum.py", line 310, in __call__
    return cls.__new__(cls, value)
  File "PROJECTPATH/.env/lib/python3.7/enum.py", line 530, in __new__
    if type(value) is cls:

Exception Type: RecursionError at /api/unit
Exception Value: maximum recursion depth exceeded while calling a Python object

[creyD]

@heywbj Do you need anything else?

[creyD]

@heywbj Do you have any take on why this is happening?

[LesPrimus]

Same problem here... But with the read_only=True parameter the error is gone... Like this:

class RecursiveModelSerializer(serializers.ModelSerializer):
    parent = RecursiveField(allow_null=True, read_only=True)

    class Meta:
        model = RecursiveModel
        fields = ('id', 'name', 'parent')

[heywbj]

Looks like the DRF implementation of get_initial leads to a recursive cycle if no initial data is provided. As a quick fix, you might be able to set the .initial_data field to rest_framework.fields.empty in your constructor. I haven't used django in over five years, and I don't have the time to fix this issue, but I encourage you to submit a pull request if you can come up with a durable solution.

 def get_initial(self):
        if hasattr(self, 'initial_data'):
            # initial_data may not be a valid type
            if not isinstance(self.initial_data, Mapping):
                return OrderedDict()

            return OrderedDict([
                (field_name, field.get_value(self.initial_data))
                for field_name, field in self.fields.items()
                if (field.get_value(self.initial_data) is not empty) and
                not field.read_only
            ])

        return OrderedDict([
            (field.field_name, field.get_initial())
            for field in self.fields.values()
            if not field.read_only
        ])

[EO2875]

@LesPrimus 's solution worked for me. I can't think of a safe implementation that would allow recursive write permissions, so I think it'll be okay for now. Might this be related to issue #30 ?