I have a working app using web2py `(1, 99, 7, datetime.datetime(2012, 3, 4,
22, 12, 8), 'stable'); Python 2.5.4: C:\Program Files
(x86)\web2py\web2py_no_console.exe`) and MySQL 5.5. If I change one field
to add `unique=True` the web2py migration fails with this error: `"<type
'exceptions.KeyError'> 'institution_name'"` where institution_name is the
name of the field in question.
I've recreated the problem using a single-table application in web2py using
MySQL. Here's the model code:
To start off (field not defined as unique):
... (usual model/db.py boilerplate)
db = DAL('mysql://w2ptest:[email protected]:3307/abc_web2py')
...
db.define_table('Institution',
Field('Institution_name', 'string', length=60,
required=True),
format='%(Institution_name)s')
I go to the appadmin page and everything looks fine. Then, making
Institution_name unique:
db.define_table('Institution',
Field('Institution_name', 'string', length=60,
required=True,
unique=True),
format='%(Institution_name)s')
I then refresh the appadmin page and get a ticket with the error. The error
line in the traceback is the last line of the modified statement above.
And, to make things worse, I can go in and undo the `unique=True`, but
web2py doesn't respond if I refresh the appadmin page...or any page served
by that web server, even in other applications! The cpu is <b>not</b>
pinned while in this state. I have to recreate the app and database to
clear the problem. (Well, I think I have to go that far. Just restarting
web2py doesn't clear it in the full case, but does clear it in my little
one-table test case.) I try to stop the server (web2py_no_console.exe), but
it fails to respond.
Instead of the `unique=True` I can `db.executesql('ALTER TABLE
abc_web2py.Institution ADD UNIQUE INDEX UX_Iname (Institution_name) ;');`
but I'd rather not, particularly as then I have to `try` that statement
because MySQL has no `...IF NOT EXIST...` capability for index creation.
Also, if I start off the model with `unique=True` in the first place,
everything is fine, and MySQL even shows the unique index as created.
