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HTML email templates: restrict amount of visible hyperlinks
Users report that some HTML email templates are confusing due to the large
number of hyperlinks in them. They typically click the first thing they see
that looks clickable without actually reading what they are clicking on,
expecting that it all points to the same thing.
In pullrequest invitations, the pullrequest and changeset URLs should be
clickable, but the source and target repository should not: this is not what
you typically want to see when taking action on this mail.
Similarly in comment emails, the corresponding repository should not be
clickable.
Unfortunately, even if we remove the <a> hyperlink tags on these repository
URLs, most mail clients will still recognize the text as being URLs
and make them clickable anyway. Worse, they will do so in a different
styling than the other links.
Therefore, do add <a> tags in the HTML, but make use of styling like that of
data_style, i.e. regular text color, grey background with dark grey border.
The links _will_ thus be clickable but it will not be as inviting as before,
thus removing confusion.
Users report that some HTML email templates are confusing due to the large
number of hyperlinks in them. They typically click the first thing they see
that looks clickable without actually reading what they are clicking on,
expecting that it all points to the same thing.
In pullrequest invitations, the pullrequest and changeset URLs should be
clickable, but the source and target repository should not: this is not what
you typically want to see when taking action on this mail.
Similarly in comment emails, the corresponding repository should not be
clickable.
Unfortunately, even if we remove the <a> hyperlink tags on these repository
URLs, most mail clients will still recognize the text as being URLs
and make them clickable anyway. Worse, they will do so in a different
styling than the other links.
Therefore, do add <a> tags in the HTML, but make use of styling like that of
data_style, i.e. regular text color, grey background with dark grey border.
The links _will_ thus be clickable but it will not be as inviting as before,
thus removing confusion.
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Database schema changes
=======================
Kallithea uses Alembic for :ref:`database migrations <upgrade_db>`
(upgrades and downgrades).
If you are developing a Kallithea feature that requires database schema
changes, you should make a matching Alembic database migration script:
1. :ref:`Create a Kallithea configuration and database <setup>` for testing
the migration script, or use existing ``development.ini`` setup.
Ensure that this database is up to date with the latest database
schema *before* the changes you're currently developing. (Do not
create the database while your new schema changes are applied.)
2. Create a separate throwaway configuration for iterating on the actual
database changes::
gearbox make-config temp.ini
Edit the file to change database settings. SQLite is typically fine,
but make sure to change the path to e.g. ``temp.db``, to avoid
clobbering any existing database file.
3. Make your code changes (including database schema changes in ``db.py``).
4. After every database schema change, recreate the throwaway database
to test the changes::
rm temp.db
gearbox setup-db -c temp.ini --repos=/var/repos --user=doe --email doe@example.com --password=123456 --no-public-access --force-yes
gearbox repo-scan -c temp.ini
5. Once satisfied with the schema changes, auto-generate a draft Alembic
script using the development database that has *not* been upgraded.
(The generated script will upgrade the database to match the code.)
::
alembic -c development.ini revision -m "area: add cool feature" --autogenerate
6. Edit the script to clean it up and fix any problems.
Note that for changes that simply add columns, it may be appropriate
to not remove them in the downgrade script (and instead do nothing),
to avoid the loss of data. Unknown columns will simply be ignored by
Kallithea versions predating your changes.
7. Run ``alembic -c development.ini upgrade head`` to apply changes to
the (non-throwaway) database, and test the upgrade script. Also test
downgrades.
The included ``development.ini`` has full SQL logging enabled. If
you're using another configuration file, you may want to enable it
by setting ``level = DEBUG`` in section ``[handler_console_sql]``.
The Alembic migration script should be committed in the same revision as
the database schema (``db.py``) changes.
See the `Alembic documentation`__ for more information, in particular
the tutorial and the section about auto-generating migration scripts.
.. __: http://alembic.zzzcomputing.com/en/latest/
Troubleshooting
---------------
* If ``alembic --autogenerate`` responds "Target database is not up to
date", you need to either first use Alembic to upgrade the database
to the most recent version (before your changes), or recreate the
database from scratch (without your schema changes applied).
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