Serialize a queryset.
(
self,
queryset,
*,
stream=None,
fields=None,
use_natural_foreign_keys=False,
use_natural_primary_keys=False,
progress_output=None,
object_count=0,
**options,
)
| 82 | stream_class = StringIO |
| 83 | |
| 84 | def serialize( |
| 85 | self, |
| 86 | queryset, |
| 87 | *, |
| 88 | stream=None, |
| 89 | fields=None, |
| 90 | use_natural_foreign_keys=False, |
| 91 | use_natural_primary_keys=False, |
| 92 | progress_output=None, |
| 93 | object_count=0, |
| 94 | **options, |
| 95 | ): |
| 96 | """ |
| 97 | Serialize a queryset. |
| 98 | """ |
| 99 | self.options = options |
| 100 | |
| 101 | self.stream = stream if stream is not None else self.stream_class() |
| 102 | self.selected_fields = fields |
| 103 | self.use_natural_foreign_keys = use_natural_foreign_keys |
| 104 | self.use_natural_primary_keys = use_natural_primary_keys |
| 105 | progress_bar = self.progress_class(progress_output, object_count) |
| 106 | |
| 107 | self.start_serialization() |
| 108 | self.first = True |
| 109 | for count, obj in enumerate(queryset, start=1): |
| 110 | self.start_object(obj) |
| 111 | # Use the concrete parent class' _meta instead of the object's |
| 112 | # _meta This is to avoid local_fields problems for proxy models. |
| 113 | # Refs #17717. |
| 114 | concrete_model = obj._meta.concrete_model |
| 115 | # When using natural primary keys, retrieve the pk field of the |
| 116 | # parent for multi-table inheritance child models. That field must |
| 117 | # be serialized, otherwise deserialization isn't possible. |
| 118 | if self.use_natural_primary_keys: |
| 119 | pk = concrete_model._meta.pk |
| 120 | pk_parent = ( |
| 121 | pk if pk.remote_field and pk.remote_field.parent_link else None |
| 122 | ) |
| 123 | else: |
| 124 | pk_parent = None |
| 125 | for field in concrete_model._meta.local_fields: |
| 126 | if field.serialize or field is pk_parent: |
| 127 | if field.remote_field is None: |
| 128 | if ( |
| 129 | self.selected_fields is None |
| 130 | or field.attname in self.selected_fields |
| 131 | ): |
| 132 | self.handle_field(obj, field) |
| 133 | else: |
| 134 | if ( |
| 135 | self.selected_fields is None |
| 136 | or field.attname[:-3] in self.selected_fields |
| 137 | ): |
| 138 | self.handle_fk_field(obj, field) |
| 139 | for field in concrete_model._meta.local_many_to_many: |
| 140 | if field.serialize: |
| 141 | if ( |