Wednesday, April 6, 2016

Cannot see participants of course 039

Alexa reported the problem that Lino did not show the content of the EnrolmentsByCourse table for a given course. The server log disclosed the reason:

File "repositories/voga/lino_voga/projects/roger/lib/courses/", line 102, in get_enrolment_info
  s += " " + self.section
TypeError: coercing to Unicode: need string or buffer, Choice found

That is, there was one participant with a non-empty section field in this course, and Lino did not yet manage this case correctly. Fixed.

This problem took only 20 minutes, including voice chat with Alexa, code change, commit, release to their production site and explanation email to Alexa.

Managing user permissions

I had a phone meeting with Gerd about managing user permissions. The existing system uses class-based “user roles” and is the best we can imagine. We had two ideas for optimizing it: #856 and #857.

#856 is clear (no discussions) but will require some work and is not vital.

For #857 here an introduction. They face the problem that even though they currently have only about a dozen of user profiles, they sometimes have difficulties to figure out which one is needed for a new user.

My idea is to solve this by providing the following table:

Profile OfficeOperator OfficeUser SepaUser DebtsUser LedgerStaff Supervisor SiteAdmin
Begleiter im DSBE   X X        
Begleiter im DSBE (Manager) X X X        
Begleiter im DSBE (+Erstempfang)   X X        
Berater Erstempfang   X X        
Empfangsschalter X   X        
Empfangsschalter (+Erstempfang) X   X        
Schuldenberater   X X X      
Sozi   X X        
Sozi (Manager) X X X        
Buchhalter   X X        
Accountant (Manager)   X X   X    
Supervisor X   X     X  
Verwalter X X X X X   X

The real table should of course (1) have more columns (configurable as a list of “key functionalities”) and (2) be accessible via the web interface.

The table has been generated using the following script:

from lino import startup

from atelier.rstgen import table
from import *
from lino_welfare.modlib.welfare.roles import *

roles = [OfficeOperator, OfficeUser, SepaUser, DebtsUser, LedgerStaff,
         Supervisor, SiteAdmin]
rows = []
headers = ["Profile"]
for r in roles:
for p in users.UserTypes.objects():
    row = [p.text]
    for r in roles:
        row.append("X" if p.has_required_roles([r]) else "")

print(table(headers, rows))