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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
This commit is contained in:
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/cli.rst
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@ -266,6 +266,16 @@ You can add a column using the ``add-column`` command::
The last argument here is the type of the column to be created. You can use one of ``text``, ``integer``, ``float`` or ``blob``. If you leave it off, ``text`` will be used.
You can add a column that is a foreign key reference to another table using the ``--fk`` option::
$ sqlite-utils add-column mydb.db dogs 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``::
$ sqlite-utils add-column mydb.db dogs species_id --fk species --fk-col ref
.. _cli_add_column_alter:
Adding columns automatically on insert/update