Note

This is a public alpha release, and therefore features and functionality may change and the software and documentation may contain technical bugs or other issues. If you discover any issues please consider registering a GitHub issue.

datasources.models.metadata module

This module contains models for dynamic assignment of metadata to data sources.

class datasources.models.metadata.MetadataField(*args, **kwargs)

Bases: django.db.models.base.Model

A metadata field that can be dynamically added to a data source.

Operational MetadataFields are those which have some associated code within PEDASI. They should be present within any deployment of PEDASI.

Current operational metadata fields are (by short_name): - data_query_param - indexed_field

exception DoesNotExist

Bases: django.core.exceptions.ObjectDoesNotExist

exception MultipleObjectsReturned

Bases: django.core.exceptions.MultipleObjectsReturned

id

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

classmethod load_inline_fixtures()

Create any instances required for the functioning of PEDASI.

This is called from within the AppConfig.

name

Name of the field

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

operational

Does the field have an operational effect within PEDASI?

short_name

Short text identifier for the field

values

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.

class datasources.models.metadata.MetadataItem(*args, **kwargs)

Bases: django.db.models.base.Model

The value of the metadata field on a given data source.

exception DoesNotExist

Bases: django.core.exceptions.ObjectDoesNotExist

exception MultipleObjectsReturned

Bases: django.core.exceptions.MultipleObjectsReturned

datasource

To which data source does this relate?

datasource_id

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

field

To which field does this relate?

field_id

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

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>

value

The value of this metadata field