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Ability to add a column that is a foreign key reference

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Python API:

    db["dogs"].add_column("species_id", fk="species")
    # or
    db["dogs"].add_column("species_id", fk="species", fk_col="ref")

CLI:

    $ sqlite-utils add-column mydb.db dogs species_id --fk species
    # or
    $ sqlite-utils add-column mydb.db dogs species_id --fk species --fk-col ref

Closes #16
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Simon Willison 2019-05-28 21:54:43 -07:00
commit 50e2f94b58
6 changed files with 118 additions and 6 deletions
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docs/python-api.rst
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@ -266,6 +266,20 @@ If you pass a Python type, it will be mapped to SQLite types as shown here::
np.float32: "FLOAT"
np.float64: "FLOAT"
You can also add a column that is a foreign key reference to another table using the ``fk`` parameter:
.. code-block:: python
db["dogs"].add_column("species_id", fk="species")
This will automatically detect the name of the primary key on the species table and use that (and its type) for the new column.
You can explicitly specify the column you wish to reference using ``fk_col``:
.. code-block:: python
db["dogs"].add_column("species_id", fk="species", fk_col="ref")
.. _python_api_add_column_alter:
Adding columns automatically on insert/update