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- """
- Helper functions for creating user-friendly representations
- of serializer classes and serializer fields.
- """
- import re
- from django.db import models
- from django.utils.encoding import force_str
- from django.utils.functional import Promise
- def manager_repr(value):
- model = value.model
- opts = model._meta
- names_and_managers = [
- (manager.name, manager)
- for manager
- in opts.managers
- ]
- for manager_name, manager_instance in names_and_managers:
- if manager_instance == value:
- return '%s.%s.all()' % (model._meta.object_name, manager_name)
- return repr(value)
- def smart_repr(value):
- if isinstance(value, models.Manager):
- return manager_repr(value)
- if isinstance(value, Promise) and value._delegate_text:
- value = force_str(value)
- value = repr(value)
- # Representations like u'help text'
- # should simply be presented as 'help text'
- if value.startswith("u'") and value.endswith("'"):
- return value[1:]
- # Representations like
- # <django.core.validators.RegexValidator object at 0x1047af050>
- # Should be presented as
- # <django.core.validators.RegexValidator object>
- return re.sub(' at 0x[0-9A-Fa-f]{4,32}>', '>', value)
- def field_repr(field, force_many=False):
- kwargs = field._kwargs
- if force_many:
- kwargs = kwargs.copy()
- kwargs['many'] = True
- kwargs.pop('child', None)
- arg_string = ', '.join([smart_repr(val) for val in field._args])
- kwarg_string = ', '.join([
- '%s=%s' % (key, smart_repr(val))
- for key, val in sorted(kwargs.items())
- ])
- if arg_string and kwarg_string:
- arg_string += ', '
- if force_many:
- class_name = force_many.__class__.__name__
- else:
- class_name = field.__class__.__name__
- return "%s(%s%s)" % (class_name, arg_string, kwarg_string)
- def serializer_repr(serializer, indent, force_many=None):
- ret = field_repr(serializer, force_many) + ':'
- indent_str = ' ' * indent
- if force_many:
- fields = force_many.fields
- else:
- fields = serializer.fields
- for field_name, field in fields.items():
- ret += '\n' + indent_str + field_name + ' = '
- if hasattr(field, 'fields'):
- ret += serializer_repr(field, indent + 1)
- elif hasattr(field, 'child'):
- ret += list_repr(field, indent + 1)
- elif hasattr(field, 'child_relation'):
- ret += field_repr(field.child_relation, force_many=field.child_relation)
- else:
- ret += field_repr(field)
- if serializer.validators:
- ret += '\n' + indent_str + 'class Meta:'
- ret += '\n' + indent_str + ' validators = ' + smart_repr(serializer.validators)
- return ret
- def list_repr(serializer, indent):
- child = serializer.child
- if hasattr(child, 'fields'):
- return serializer_repr(serializer, indent, force_many=child)
- return field_repr(serializer)
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