Cliff,
No worries - I understand where are you coming from. From the beginning I
had 3 options of table structure for my app. I have decided consciously
that I am going to use one table as a storage for program parameters. Where
each new program brings 1 to N new columns/fields to the existing
param_table. So I have done lots of work based on this 'architecture'
thinking that it is super simple to add column to existing table and now I
come to the task where I want to implement it - I have got stack. I wonder
what is wrong in this approach from your point of you? What is
the maximum number of fields I can theoretically add to the table?
On Friday, February 7, 2014 4:31:49 PM UTC+3, Cliff Kachinske wrote:
>
> Andrey,
>
> Not to be negative, but why do you want to do this?
>
> On Friday, February 7, 2014 8:07:10 AM UTC-5, Andrey K wrote:
>>
>> Thanks Anthony for your concise answer!
>> I have tried it in the app code - it did not work, giving me no error. I
>> have tried your code in the terminal and it looks the code does not create
>> new table field. Any idea why it does not work? Maybe its my db settings? I
>> use sqlite db. Your help would very helpful to me as all my app
>> dependent on this function.
>>
>> Here is my trial in a terminal:
>>
>> >>> from gluon import DAL, Field
>> >>> db = DAL('sqlite://se2.sqlite',check_reserved=['postgres',
>> 'postgres_nonreserved'],pool_size=10,lazy_tables=True, migrate=True,
>> fake_migrate=False)
>>
>> >>> ta_args = dict(format='%(f1)s')
>>
>>
>> >>> db.define_table('ta', Field('f1', 'string'), **ta_args)
>> >>> db._tables
>> ['ta']
>> >>> db.ta._fields
>>
>> ['id', 'f1']
>> #if understand correctly here I am trying to add new field 'newfield' to
>> the ta table.
>> >>> db.define_table('ta', db.ta,Field('newfield', 'string', default =
>> 'abc'),redefine=True, **ta_args)
>> >>> db.ta._fields
>> #it giving me no change in db.table field list
>>
>> ['id', 'f1']
>>
>> On Thursday, February 6, 2014 4:41:29 PM UTC+3, Anthony wrote:
>>>
>>> The safest way is probably to redefine the whole table.
>>>
>>> *models/dp.py:*
>>>
>>> tA_args = dict(format='%(f1)s', ...)
>>> db.define_table('tA',
>>> Field('f1', 'string'),
>>> **tA_args)
>>>
>>> *controllers/default.py:*
>>>
>>> db.define_table('tA', db.tA,
>>> Field('newfield'),
>>> redefine=True, **tA_args)
>>>
>>> Anthony
>>>
>>
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