Thanks for that. I didn't realize field-level migrations don't work with
MySQL. I'm no expert on web2py migrations (or even web2py!); is it just
with MySQL that it has these problems?
I suppose I could do this as an alternative to what you suggested: In
web2py add a new field with unique, then in MySQL UPDATE all records,
setting newField = oldField. I'd have to handle duplicates here, but at
least I wouldn't lost all my data. Then, when satisfied, delete oldField
and maybe rename newField to oldField.
On Thursday, July 5, 2012 12:26:31 PM UTC-6, Jim S wrote:
>
> I believe that field level migrations do not work with MySQL. I get
> around this by removing the column, saving, run the app to force migration,
> and then add the field back the way I want it. I know this causes you to
> lose the data in that column, but I only do this in my test environment and
> have migrations turned off in production.
>
> Alternatively, you could update the column def in web2py, change manually
> in mysql and then run with migrate=False, fake_migrate=True to get things
> back in sync.
>
> Hope that helps.
>
> -Jim
>
> On Wednesday, July 4, 2012 10:29:10 AM UTC-5, MichaelF wrote:
>>
>> 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:abcde...@mysql5.server.com: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.
>>
>>
