atoti.Dimension.default

property Dimension.default_hierarchy: Hierarchy

The default hierarchy of the dimension. Some UIs support clicking on a dimension (or drag and dropping it) as a shortcut to add its default hierarchy to a widget.

>>> table = session.create_table(
...     "Sales",
...     data_types={
...         "Product": "String",
...         "Shop": "String",
...         "Customer": "String",
...         "Date": "LocalDate",
...     },
... )
>>> cube = session.create_cube(table, mode="manual")
>>> h = cube.hierarchies
>>> for column_name in table:
...     h[column_name] = [table[column_name]]
...     assert h[column_name].dimension_name == table.name
>>> dimension = cube.dimensions["Sales"]

By default, the default hierarchy of a dimension is the first created one:

>>> dimension.default_hierarchy.name
'Product'

The default hierarchy can be changed:

>>> dimension.default_hierarchy = h["Shop"]
>>> dimension.default_hierarchy.name
'Shop'

When the default hierarchy is deleted, the first created remaining one becomes the default:

>>> del h["Shop"]
>>> dimension.default_hierarchy.name
'Product'

The same thing occurs if the default hierarchy is moved to another dimension:

>>> h["Product"].dimension_name = "Product"
>>> dimension.default_hierarchy.name
'Customer'

Since Product is the first created hierarchy of the newly created dimension, it is the default one there:

>>> cube.dimensions["Product"].default_hierarchy.name
'Product'

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Dimension.default_hierarchy