mirror of
https://github.com/graphql-python/graphene-django.git
synced 2024-11-22 17:47:12 +03:00
103 lines
2.7 KiB
Python
103 lines
2.7 KiB
Python
import inspect
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import six
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from django.db import models
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from django.db.models.manager import Manager
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from django.utils.encoding import force_text
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from django.utils.functional import Promise
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from graphene.utils.str_converters import to_camel_case
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try:
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import django_filters # noqa
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DJANGO_FILTER_INSTALLED = True
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except ImportError:
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DJANGO_FILTER_INSTALLED = False
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def isiterable(value):
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try:
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iter(value)
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except TypeError:
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return False
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return True
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def _camelize_django_str(s):
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if isinstance(s, Promise):
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s = force_text(s)
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return to_camel_case(s) if isinstance(s, six.string_types) else s
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def camelize(data):
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if isinstance(data, dict):
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return {_camelize_django_str(k): camelize(v) for k, v in data.items()}
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if isiterable(data) and not isinstance(data, (six.string_types, Promise)):
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return [camelize(d) for d in data]
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return data
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def get_reverse_fields(model, local_field_names):
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for name, attr in model.__dict__.items():
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# Don't duplicate any local fields
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if name in local_field_names:
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continue
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# "rel" for FK and M2M relations and "related" for O2O Relations
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related = getattr(attr, "rel", None) or getattr(attr, "related", None)
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if isinstance(related, models.ManyToOneRel):
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yield (name, related)
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elif isinstance(related, models.ManyToManyRel) and not related.symmetrical:
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yield (name, related)
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def maybe_queryset(value):
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if isinstance(value, Manager):
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value = value.get_queryset()
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return value
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def get_model_fields(model):
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local_fields = [
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(field.name, field)
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for field in sorted(
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list(model._meta.fields) + list(model._meta.local_many_to_many)
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)
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]
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# Make sure we don't duplicate local fields with "reverse" version
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local_field_names = [field[0] for field in local_fields]
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reverse_fields = get_reverse_fields(model, local_field_names)
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all_fields = local_fields + list(reverse_fields)
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return all_fields
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def is_valid_django_model(model):
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return inspect.isclass(model) and issubclass(model, models.Model)
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def import_single_dispatch():
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try:
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from functools import singledispatch
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except ImportError:
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singledispatch = None
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if not singledispatch:
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try:
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from singledispatch import singledispatch
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except ImportError:
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pass
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if not singledispatch:
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raise Exception(
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"It seems your python version does not include "
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"functools.singledispatch. Please install the 'singledispatch' "
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"package. More information here: "
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"https://pypi.python.org/pypi/singledispatch"
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)
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return singledispatch
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