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docs: update docs to show decimal field support and check constraints #683

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Jul 26, 2021
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docs: update docs to show decimal field support and check constraints #683

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23 changes: 8 additions & 15 deletions README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -283,23 +283,16 @@ were created.
Spanner does not support ``ON DELETE CASCADE`` when creating foreign-key
constraints, so this is not supported in ``django-google-spanner``.

Check constraints aren't supported
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
``Unsigned`` datatypes are not supported
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Spanner does not support ``CHECK`` constraints so one isn't created for
`PositiveIntegerField
Spanner does not support ``Unsigned`` datatypes so `PositiveIntegerField
<https://docs.djangoproject.com/en/stable/ref/models/fields/#positiveintegerfield>`__
and `CheckConstraint
<https://docs.djangoproject.com/en/stable/ref/models/constraints/#checkconstraint>`__
can't be used.

No native support for ``DecimalField``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Spanner's support for `Decimal <https://www.python.org/dev/peps/pep-0327/>`__
types is limited to
`NUMERIC <https://cloud.google.com/spanner/docs/data-types#numeric_types>`__
precision. Higher-precision values can be stored as strings instead.
and `PositiveSmallIntegerField
<https://docs.djangoproject.com/en/3.2/ref/models/fields/#positivesmallintegerfield>`__
are both stored as `Integer type
<https://cloud.google.com/spanner/docs/data-types#integer_type>`__
.

``Meta.order_with_respect_to`` model option isn't supported
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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