HABTM Problem/Bug

[Randy Schmidt]

Hiya,

I'm creating an object and associating it with existing objects by
setting the category_ids on the new object. It doesn't seem to work on
create but does work on update:

https://gist.github.com/3784696

I've done this countless times before and I cannot figure out what is
up. It's not an attr_accessible problem because I'm not using that on
this project, I'm using strong_parameters. I tried removing all of
that stuff and still nothing. I can even spit out the ids after create
with something like:

after_create do
Rails.logger.fatal "*"*75
Rails.logger.fatal categories
Rails.logger.fatal magazines
end

but the associations are never saved. I'm thinking it's a bug but my
Googling hasn't turned up anything. Ideas?

Thanks!
--
Randy Schmidt

[Dwyer, Mike]

Randy,

I think you need to save the drawing or the IDs have nothing to associate with. Have you tried that?

Thanks,

Mike

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Randy Schmidt

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Thanks,

Mike

[Randy Schmidt]

Hey Mike,

Yeah, I've tried that. The second, passing test is pretty much that
except it doesn't work unless I have the reload on line 14. Basically,
category_ids can't have anything in it before assigning it again and
saving.

This has worked in the past and whenever I had a problem, it was
always because I forgot to add category_ids to attr_accessible and
then selecting the checkboxes in the browser would work again.

I think it may be related to not having an id yet on create but it
should do these associations after the drawing is saved.

Thanks,
Randy

Randy Schmidt

[Dwyer, Mike]

Randy,

What if you changed lines 3 and 4 to (note the exclamation point):

 category = create!(:category)

 drawing = create!(:drawing, category_ids: [category.id]) 


Woudn't that force the issue of having an existing drawing with an official id and therefore able to associate the related category ids?

Or am I missing something about "create()" not being part of the actual Drawing or Category?

Mike

[Dwyer, Mike]

Randy,

What about adding this into your tests?

category = create(:category)

category.id.should_not be_nil

drawing = create(:drawing, category_ids: [category.id])

drawing.id.should_not be_nil

That might prove whether or not the IDs exist yet.

Mike

[Walter Lee Davis]

I have found that using the association build method will work when (manually) setting the id won't.

Walter

[Randy Schmidt]

To follow-up, I wasn't trying to build or create an associated record,
just associate existing records with the drawing on create.

I updated the gist to include code from another app that worked:
https://gist.github.com/3784696

It ended up being something to do with another callback:

included do
after_create :cache_slug!
before_save :cache_slug, if: :title_changed?
end

def cache_slug
self.slug = [title.parameterize, id].join('-')
end

def cache_slug!
cache_slug
save!
end

I haven't fixed it yet, but getting rid of the "after_create" got my
test to pass.

Yay!
--
Randy Schmidt

[Randy Schmidt]

Hrm, I can't remember what ended up happening but thanks for getting back to me! Glad you found a solution too :)

On Mon, Apr 15, 2013 at 1:14 PM, Eric Retzloff <eret...@gmail.com> wrote:

Randy, 

I don't know if you ever found a solution to this. I had a similar problem. StrongParameters considers HM and HABTM associations to be nested. Use something like ... {:category_ids => []}... in your permit line. Take a look... https://github.com/rails/strong_parameters#nested-parameters. 

HTH,

Eric 

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Randy Schmidt