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Optionally limit ColumnType subclasses to specific SQLite types (#2673)

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* ColumnTypes now have optional SQLite column types

Refs #2672
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Simon Willison 2026-03-18 11:37:09 -07:00 • committed by GitHub
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8 changed files with 198 additions and 10 deletions
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7
docs/plugin_hooks.rst
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@ -1004,13 +1004,14 @@ Return a list of :ref:`ColumnType <column_types>` **subclasses** (not instances)
.. code-block:: python
from datasette import hookimpl
from datasette.column_types import ColumnType
from datasette.column_types import ColumnType, SQLiteType
import markupsafe
class ColorColumnType(ColumnType):
name = "color"
description = "CSS color value"
sqlite_types = (SQLiteType.TEXT,)
async def render_cell(
self,
@ -1052,6 +1053,9 @@ Each ``ColumnType`` subclass must define the following class attributes:
``description`` - string
Human-readable label, e.g. ``"CSS color value"``.
``sqlite_types`` - tuple of ``SQLiteType`` values, optional
Restrict assignments of this column type to columns with matching SQLite types, e.g. ``(SQLiteType.TEXT,)``. If omitted, the column type can be assigned to any column.
And the following methods, all optional:
``render_cell(self, value, column, table, database, datasette, request)``
@ -2485,4 +2489,3 @@ Tokens can then be created and verified using :ref:`datasette.create_token() <da
actor = await datasette.verify_token(token)
If no handlers are registered, ``create_token()`` raises ``RuntimeError``. If the requested ``handler`` name is not found, it raises ``ValueError``.