It is not like that field level migrations do not work. They work if, for example you change a field type. They do not work it you change an attribute (unique, notnull).
On Thursday, 5 July 2012 16:40:42 UTC-5, MichaelF wrote: > > 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. >>> >>>