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fiftyone.core.odm.mixins

Mixins and helpers for dataset backing documents.

Copyright 2017-2022, Voxel51, Inc.
voxel51.com

Classes:

DatasetMixin

Mixin interface for fiftyone.core.odm.document.Document subclasses that are backed by a dataset.

NoDatasetMixin

Mixin for fiftyone.core.odm.document.SerializableDocument subtypes that are not backed by a dataset.

Functions:

get_default_fields(cls[, include_private, …])

Gets the default fields present on all instances of the given DatasetMixin class.
fiftyone.core.odm.mixins.get_default_fields(cls, include_private=False, use_db_fields=False)

Gets the default fields present on all instances of the given DatasetMixin class.

Parameters

  • cls – the DatasetMixin class

  • include_private (False) – whether to include fields starting with _

  • use_db_fields (False) – whether to return database fields rather than user-facing fields, when applicable

Returns

a tuple of field names

class fiftyone.core.odm.mixins.DatasetMixin

Bases: object

Mixin interface for fiftyone.core.odm.document.Document subclasses that are backed by a dataset.

Methods:

add_field(path, ftype[, embedded_doc_type, …])

Adds a new field or embedded field to the document, if necessary.

add_implied_field(path, value[, …])

Adds the field or embedded field to the document, if necessary, inferring the field type from the provided value.

clear_field(field_name)

get_field(field_name)

get_field_schema([ftype, embedded_doc_type, …])

Returns a schema dictionary describing the fields of this document.

has_field(field_name)

merge_field_schema(schema[, expand_schema, …])

Merges the field schema into this document.

set_field(field_name, value[, create, …])

Attributes:

collection_name

field_names

property collection_name
property field_names
has_field(field_name)
get_field(field_name)
set_field(field_name, value, create=True, validate=True, dynamic=False)
clear_field(field_name)
classmethod get_field_schema(ftype=None, embedded_doc_type=None, include_private=False)

Returns a schema dictionary describing the fields of this document.

If the document belongs to a dataset, the schema will apply to all documents in the collection.

Parameters

  • ftype (None) – an optional field type to which to restrict the returned schema. Must be a subclass of fiftyone.core.fields.Field

  • embedded_doc_type (None) – an optional embedded document type to which to restrict the returned schema. Must be a subclass of fiftyone.core.odm.BaseEmbeddedDocument

  • include_private (False) – whether to include fields that start with _ in the returned schema

Returns

a dictionary mapping field names to field types

classmethod merge_field_schema(schema, expand_schema=True, recursive=True, validate=True)

Merges the field schema into this document.

Parameters

  • schema – a dictionary mapping field names or ``embedded.field.names``to fiftyone.core.fields.Field instances

  • expand_schema (True) – whether to add new fields to the schema (True) or simply validate that fields already exist with consistent types (False)

  • recursive (True) – whether to recursively merge embedded document fields

  • validate (True) – whether to validate the field against an existing field at the same path

Returns

True/False whether any new fields were added

Raises

ValueError – if a field in the schema is not compliant with an existing field of the same name or a new field is found but expand_schema == False

classmethod add_field(path, ftype, embedded_doc_type=None, subfield=None, fields=None, description=None, info=None, expand_schema=True, recursive=True, validate=True, **kwargs)

Adds a new field or embedded field to the document, if necessary.

Parameters
Returns

True/False whether one or more fields or embedded fields were added to the document or its children

Raises

ValueError – if a field in the schema is not compliant with an existing field of the same name

classmethod add_implied_field(path, value, expand_schema=True, dynamic=False, recursive=True, validate=True)

Adds the field or embedded field to the document, if necessary, inferring the field type from the provided value.

Parameters

  • path – the field name or embedded.field.name

  • value – the field value

  • expand_schema (True) – whether to add new fields to the schema (True) or simply validate that the field already exists with a consistent type (False)

  • dynamic (False) – whether to declare dynamic embedded document fields

  • recursive (True) – whether to recursively add embedded document fields

  • validate (True) – whether to validate the field against an existing field at the same path

Returns

True/False whether one or more fields or embedded fields were added to the document or its children

Raises

ValueError – if a field in the schema is not compliant with an existing field of the same name

class fiftyone.core.odm.mixins.NoDatasetMixin

Bases: object

Mixin for fiftyone.core.odm.document.SerializableDocument subtypes that are not backed by a dataset.

Methods:

clear_field(field_name)

delete()

from_dict(d[, extended])

get_field(field_name)

has_field(field_name)

reload()

save()

set_field(field_name, value[, create, …])

to_dict([extended])

Attributes:

field_names

in_db

property field_names
property in_db
has_field(field_name)
get_field(field_name)
set_field(field_name, value, create=True, validate=True, dynamic=False)
clear_field(field_name)
to_dict(extended=False)
classmethod from_dict(d, extended=False)
save()
reload()
delete()