= Developer Guidelines - Basics = 
Here are some helpful hints to get started developing in Sahana Eden.
== Running Sahana Eden ==
{{{
cd .. # the web2py main directory
python web2py.py
}}}
Or if you don't want to have to enter a password (or have issues launching the Web2Py GUI).
{{{
python web2py.py -a 1234
}}}

== Wiping the Database ==
Out of the box Sahana Eden is set to use the SQLite database. If you want to wipe all the data, simply delete the {{{databases/}}} directory, along with the {{{sessions/}}} directory (this contains details about your login - which will be invalid as you'll be deleting the user account). The next time you run Sahana Eden, it will recreate the database tables.

== Pre-Populating Data ==
Sahana Eden is able to "[DeveloperGuidelines/PrePopulate Pre-Populate]" data so you can explore/test/develop the application with different types of data. Pre-Populate options are associated with the [DeveloperGuidelines/Templates Templates], but they can be set in {{{models/000_config.py}}}.

{{{IFRC_Train}}} is a good set of pre-populate to use (See: https://github.com/flavour/eden/tree/master/private/templates/IFRC_Train). It also has an admin user account: admin@example.com password: testing. To use it edit {{{models/000_config.py}}}:

After:
{{{
# =============================================================================
# Over-rides to the Template may be done here
}}}
Add (or un-comment):
{{{
settings.base.prepopulate = ["IFRC_Train"]
}}}

Pre-populate data will only be created if the database is empty, so you may need to wipe the database first. It may take a few minutes to load the data.

== Debug Mode ==
In {{{models/000_config.py}}} uncomment this line:
{{{
settings.base.debug = True
}}}
to:
* Use the non-minified CSS & JS
* See changes in {{{modules/eden}} files without restarting Web2Py

== Running a Sahana Eden Python Shell ==
To open a Python Shell in the Sahana Eden Environment, where you can inspect Sahana Eden variable as well as access the data:
{{{
cd .. # the web2py main directory
python web2py.py -S eden -M
}}}
To create data you will need to use the {{{db.commit()}}} command.