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.. This file is part of Invenio
Copyright (C) 2014 CERN.
Invenio is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
Invenio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with Invenio; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
.. _developers-modules:
Modules
=======
Modules are application components that can be used within an application or
across aplications. They can contain :ref:`SQLAlchemy <sqlalchemy:overview>`
models, :ref:`Flask view <flask:tutorial>`, :py:class:`Jinja2 templates
<jinja:jinja2.Template>` and other :ref:`pluggable-objects`.
Discovery of modules is done based on the ``PACKAGES`` configuration parameter,
where the `*` wildcard character is supported at the end of the
package path after the last dot (e.g. ``foo.bar.something.*``).
Views
-----
Flask uses a concept of *blueprints* for making application components and
supporting common patterns within an application or across applications.
Blueprints can greatly simplify how large applications work and provide a
central means for Flask extensions to register operations on applications. A
:py:class:`~flask.Blueprint` object works similarly to a
:py:class:`~flask.Flask` application object, but it is not actually an
application. Rather it is a *blueprint* of how to construct or extend an
application.
Blueprints in Flask are intended for these cases:
* Factor an application into a set of blueprints. This is ideal for
larger applications; a project could instantiate an application object,
initialize several extensions, and register a collection of blueprints.
* Register a blueprint on an application at a URL prefix and/or subdomain.
Parameters in the URL prefix/subdomain become common view arguments
(with defaults) across all view functions in the blueprint.
* Register a blueprint multiple times on an application with different URL
rules.
* Provide template filters, static files, templates, and other utilities
through blueprints. A blueprint does not have to implement applications
or view functions.
* Register a blueprint on an application for any of these cases when
initializing a Flask extension.
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