I have a code that works OK except when there is no data in the database.
Here is the code, using MongoDB.
model code:
db.define_table('sleep',
Field('awake','double',default=0),
Field('light_sleep','double',default=0),
Field('deep_sleep','double',default=0),
Field('author', 'reference auth_user',
default=auth.user_id, readable=False, writable=False),
common_filter = lambda query: db.sleep.author ==
auth.user_id)
def sleep_chart():
response.files.append(URL('e_default','static/js/pygal-tooltips.min.js'))
response.headers['Content-Type']='image/svg+xml'
custom_style = Style(
background='transparent',
plot_background='transparent',
foreground='#53E89B',
foreground_strong='#53A0E8',
foreground_subtle='#630C0D',
opacity='.6',
opacity_hover='.9',
transition='400ms ease-in',
colors=('#E853A0', '#E8537A', '#E95355', '#E87653', '#E89B53')
)
data = db(db.sleep).select()
gauge = pygal.SolidGauge(inner_radius=0.70)
percent_formatter = lambda x: '{:.10g}Hrs'.format(x)
gauge.value_formatter = percent_formatter
gauge.add('Awake', [{'value':[i.awake for i in data][-1], 'max_value':
24}])
gauge.add('Light Sleep', [{'value':[i.light_sleep for i in data][-1],
'max_value': 24}])
gauge.add('Deep Sleep', [{'value':[i.deep_sleep for i in data][-1],
'max_value': 24}])
return gauge.render()
def mySleep():
chart= URL('default', 'sleep_chart')
form = SQLFORM(db.sleep, submit_button=T('Submit')).process()
return dict(chart = chart,form=form)
Here is the problem:
When a new user registers into the system, by default, there is no data
recorded in the database, so I get the error(see attached) below.
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Traceback (most recent call last):
File "/home/mau/web2py/gluon/restricted.py", line 219, in restricted
exec(ccode, environment)
File "/home/mau/web2py/applications/Hesty/controllers/e_default.py"
<http://127.0.0.1:8000/admin/default/edit/Hestque_Wellness/controllers/e_default.py>
, line 708, in <module>
File "/home/mau/web2py/gluon/globals.py", line 421, in <lambda>
self._caller = lambda f: f()
File "/home/mau/web2py/gluon/tools.py", line 3868, in f
return action(*a, **b)
File "/home/mau/web2py/applications/Hesty/controllers/e_default.py"
<http://127.0.0.1:8000/admin/default/edit/Hestque_Wellness/controllers/e_default.py>
, line 649, in sleep_chart
gauge.add('Awake', [{'value':[i.awake for i in data][-1], 'max_value': 24
}])
IndexError: list index out of range
Expectation:I want to have a default figure in the database. I have tried
having "default=0" but the int only appears in the form text area. So the
error persists.
Is there a way to have a default figure in the database or a way to catch
this errors and let the new user to input int figure?
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