check merge migrations. some migrations the framework will combine whenever
possible.
Em 20/02/2015 17:15, "Martin Kapfhammer" <mart.kapfham...@gmail.com>
escreveu:
> Yep, I can drop the column and create a new one as integer.
> The only problem I have is that creating the field as a char was in
> migration number 0020, changing it to a foreign key was in migration number
> 0028 and now I have already 0036 migrations. Therefore I have to "hang in"
> the dropping and adding code between 0020 and 0028. How can I do this? I
> can write the migration files by hand, but what is the logic to hang it in
> e.g. before 0028 with already a 0027 existing.
>
> What's best practice here?
>
> Am Freitag, 20. Februar 2015 18:16:48 UTC+1 schrieb george:
>>
>> The deal here is that the model Currency has an ID, which is well,
>> integer.
>>
>> Your data that is already on that column, is char (original field). If
>> you are not in production, I would recommend dropping the field (comment
>> the code), make migrations and apply. that will remove the currency column.
>> Then add the new column, make migrations and apply.
>>
>> On Fri, Feb 20, 2015 at 2:30 PM, Martin Kapfhammer <mart.ka...@gmail.com>
>> wrote:
>>
>>> First I created a CharField:
>>> ('currency', models.CharField(max_length=30)),
>>>
>>> In a later migration I changed it to a foreign key field:
>>>
>>> field=models.ForeignKey(to='web.Currency'),
>>>
>>> It worked on a local MySql instance, but not on Postgres on Heroku:
>>> django.db.utils.ProgrammingError: column "currency_id" cannot be cast
>>> automatically to type integer
>>> HINT: Specify a USING expression to perform the conversion.
>>>
>>> If I do the following manually, I can continue:
>>>
>>> alter table web_financialdata drop column currency;
>>> alter table web_financialdata add column currency integer;
>>>
>>> Should I add this via RunSQL between the migrations. If so, how? Or is
>>> there a better way?
>>>
>>> Thanks,
>>> Martin
>>>
>>>
>>>
>>>
>>>
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>>
>>
>>
>> --
>> George R. C. Silva
>> SIGMA Consultoria
>> ----------------------------
>> http://www.consultoriasigma.com.br/
>>
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