Part

class database.models.Part(*args, **kwargs)

Bases: database.mixins.file_and_source_info_mixin.FileAndSourceInfoMixin, database.mixins.contribution_info_mixin.ContributionInfoMixin, database.models.custom_base_model.CustomBaseModel

A single voice or instrument in a Section of a Musical Work.

Purely abstract entity that can manifest in differing versions. Must belong to one and only one Section.

written_for

models.ForeignKey – Reference to the Instrument for which this Part was written

s.section

models.ForeignKey – Reference to the Section to which this Part belongs

sources

models.ManyToOneRel – References to Sources that instantiate this Part

contributions

models.ManyToOneRel – References to Contributions objects that describe the contributions (and thus the contributors) of this Part

See also

database.models.CustomBaseModel, database.models.Section, database.models.Contribution, database.models.Instrument

Attributes Summary

contributions	Accessor to the related objects manager on the reverse side of a many-to-one relation.
id	A wrapper for a deferred-loading field.
objects
section	Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.
section_id	A wrapper for a deferred-loading field.
source_instantiations	Accessor to the related objects manager on the forward and reverse sides of a many-to-many relation.
written_for	Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.
written_for_id	A wrapper for a deferred-loading field.

Methods Summary

clean()	Ensure that only Sections with no children have parts
get_next_by_date_created(*[, field, is_next])
get_next_by_date_updated(*[, field, is_next])
get_previous_by_date_created(*[, field, is_next])
get_previous_by_date_updated(*[, field, is_next])
musical_work()	Get the MusicalWork to which this Part belongs.

Attributes Documentation

contributions

Accessor to the related objects manager on the reverse side of a many-to-one relation.

In the example:

class Child(Model):
    parent = ForeignKey(Parent, related_name='children')

Parent.children is a ReverseManyToOneDescriptor instance.

Most of the implementation is delegated to a dynamically defined manager class built by create_forward_many_to_many_manager() defined below.

id

A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

objects = <django.db.models.manager.Manager object>

section

Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.

In the example:

class Child(Model):
    parent = ForeignKey(Parent, related_name='children')

Child.parent is a ForwardManyToOneDescriptor instance.

section_id

A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

source_instantiations

Accessor to the related objects manager on the forward and reverse sides of a many-to-many relation.

In the example:

class Pizza(Model):
    toppings = ManyToManyField(Topping, related_name='pizzas')

Pizza.toppings and Topping.pizzas are ManyToManyDescriptor instances.

Most of the implementation is delegated to a dynamically defined manager class built by create_forward_many_to_many_manager() defined below.

written_for

Accessor to the related object on the forward side of a many-to-one or one-to-one (via ForwardOneToOneDescriptor subclass) relation.

In the example:

class Child(Model):
    parent = ForeignKey(Parent, related_name='children')

Child.parent is a ForwardManyToOneDescriptor instance.

written_for_id

A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

Methods Documentation

clean() → None

Ensure that only Sections with no children have parts

Raises:ValidationError – If the Section being validated has child sections and also has Parts

get_next_by_date_created(*, field=<django.db.models.fields.DateTimeField: date_created>, is_next=True, **kwargs)

get_next_by_date_updated(*, field=<django.db.models.fields.DateTimeField: date_updated>, is_next=True, **kwargs)

get_previous_by_date_created(*, field=<django.db.models.fields.DateTimeField: date_created>, is_next=False, **kwargs)

get_previous_by_date_updated(*, field=<django.db.models.fields.DateTimeField: date_updated>, is_next=False, **kwargs)

musical_work()

Get the MusicalWork to which this Part belongs.