On Dec 24, 2011, at 2:18 AM, Bob Smith wrote:
> On Dec 20, 3:53 am, Colin Law <clan...@googlemail.com> wrote:
>> On 20 December 2011 07:03, Bob Smith <bsm...@gmail.com> wrote:
>>
>>> I'm doing a list of family members, each with aradiobutton for head
>>> of household. After the household record and the records for each
>>> person are created, it is easy to set the hoh field to the person
>>> wanted. The problem comes if I try to set this field before the
>>> create. Then the field is 0, and this isn't updated after the record
>>> is created.
>>
>> Show us how you are setting the field, presumably increatein the controller.
>>
>> Colin
>
> I was using a variable called hoh in the household (master) record.
> This was holding the id number of the person (child) record selected.
> This worked fine for existing records, but got lost with records
> created at the time of the save, as these records had no id yet.
>
> Someone else suggested that I put the hoh variable in the person
> records, but if I do this, each radio button is separate, and there is
> no way to allow only one selection.
>
> It seems to me that there must be a way to do this with Active Record
> Callbacks. After the record is created, it has an id. Couldn't I test
> each person record after create, and if it has the radio button
> selected, pass the id to the Household.hoh variable..
>
> But for this... Is there a way to tell if the radio button is selected
> if it points to a variable somewhere else ?? Or is there a way to get
> Rails to just do this at the right time the way it does with parent/
> child records, setting all id's and parent_id's ??
>
>
> Too many question marks.
Use an :after_create callback in those cases; you will have the ID at that
point and you can use it. Remember, you will need to set any relationship keys
directly, not at the object level, since you can't call save again in an
after_create (I don't think). Here's my after_save method from a similar setup:
def set_primary
self.update_attributes( :role_id => self.roles.first.id ) if
self.roles.first
end
This is from inside a Title, which has_many roles, has_many people through
roles, and belongs_to one role (designating the "primary" person, like the
author or the editor -- the one that people think of when they're looking for
that book, even though lots of people may have contributed to it).
I needed to go this route because I was using Ryan Bates' nested_form gem, and
so I was adding roles to a title that hadn't been saved yet -- very similar to
your setup if I recall correctly. Since I can't designate a primary in the #new
method, because nothing has an ID yet, I use this callback to sort things out,
and count on my editors to always choose the most important person first. I
have a new_record? test in my view to hide the radio buttons in that case, and
show them in the #edit view of the same form.
Walter
>
> Bob
>
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