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prefer --app over FLASK_APP in docs

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David Lord 2022-06-17 09:26:26 -07:00
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docs/config.rst
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@ -47,61 +47,33 @@ Environment and Debug Features
The :data:`ENV` and :data:`DEBUG` config values are special because they
may behave inconsistently if changed after the app has begun setting up.
In order to set the environment and debug mode reliably, Flask uses
environment variables.
In order to set the environment and debug mode reliably, pass options to
the ``flask`` command or use environment variables.
The environment is used to indicate to Flask, extensions, and other
programs, like Sentry, what context Flask is running in. It is
controlled with the :envvar:`FLASK_ENV` environment variable and
defaults to ``production``.
The execution environment is used to indicate to Flask, extensions, and
other programs, like Sentry, what context Flask is running in. It is
controlled with the ``FLASK_ENV`` environment variable, or the
``--env`` option when using the ``flask`` command, and defaults to
``production``.
Setting :envvar:`FLASK_ENV` to ``development`` will enable debug mode.
``flask run`` will use the interactive debugger and reloader by default
in debug mode. To control this separately from the environment, use the
:envvar:`FLASK_DEBUG` flag.
.. versionchanged:: 1.0
Added :envvar:`FLASK_ENV` to control the environment separately
from debug mode. The development environment enables debug mode.
Setting ``--env development`` will enable debug mode. ``flask run`` will
use the interactive debugger and reloader by default in debug mode. To
control this separately from the environment, use the
``--debug/--no-debug`` option or the ``FLASK_DEBUG`` environment
variable.
To switch Flask to the development environment and enable debug mode,
set :envvar:`FLASK_ENV`:
set ``--env``:
.. tabs::
.. code-block:: text
.. group-tab:: Bash
$ flask --app hello --env development run
.. code-block:: text
$ export FLASK_ENV=development
$ flask run
.. group-tab:: Fish
.. code-block:: text
$ set -x FLASK_ENV development
$ flask run
.. group-tab:: CMD
.. code-block:: text
> set FLASK_ENV=development
> flask run
.. group-tab:: Powershell
.. code-block:: text
> $env:FLASK_ENV = "development"
> flask run
Using the environment variables as described above is recommended. While
it is possible to set :data:`ENV` and :data:`DEBUG` in your config or
code, this is strongly discouraged. They can't be read early by the
``flask`` command, and some systems or extensions may have already
configured themselves based on a previous value.
Using the options or environment variables as described above is
recommended. While it is possible to set :data:`ENV` and :data:`DEBUG`
in your config or code, this is strongly discouraged. They can't be read
early by the ``flask`` command, and some systems or extensions may have
already configured themselves based on a previous value.
Builtin Configuration Values