On Wed, Mar 30, 2011 at 12:11 PM, James Byrne
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> I have a model in whose migration I have defined a datetime column that
> both has a default value and sets null to false. As this is a
> PostgreSQL database the default value is ''infinity'',
which may be the
> source of the difficulty.
>
> When I attempt to save this model ActiveRecord produces an SQL statement
> that explicitly sets this column to NULL thus both defeating the purpose
> of the default value and triggering the NOT NULL constraint on the DBMS.
>
> How does one turn off or override this behaviour? What I want to happen
> is that model_instance.save will only specify columns that have values
> set and will simply not include any column that does not have an
> explicit value set.
>
> I can see that for other attributes ActiveRecord is setting things to
> the defaults provided in the migration. Is this the case? If not then
> where is ActiveRecord getting this information? And why bother? The
> purpose of a default value on a database column is to have the DBMS
> provide for the absence of information at the DBMS level. If I wish to
> do that at the attribute level then I can do so in the model class
> itself.
>
>
It sounds like you default of "infinity" is not being honored at all.
Most
likely because it is not a valid datetime and ActiveRecord doesn''t know
what
to set it as. In irb if you create a new instance of that model (model.new)
you should see all the default values set. If you are not seeing one for
datetime then "infinity" is not being honored as a valid datetime. I
would
suggest changing "infinity" to a datetime that is 50 years into the
future.
Good luck.
B.
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