Rails 4 and HABTM Checkboxes: Unpermitted parameters error

[Walter Lee Davis]

I have a simple Rails 4 project with two scaffolded models: Practice and Practitioner. I have set these both as habtm and am in the process of adding checkboxes to the Practitioner form so that I can check off the practices that this practitioner belongs to. In the practitioners_controller, I added practice_ids to the practitioner_params permit list, but I am still getting the error:

Started PATCH "/practitioners/1" for 127.0.0.1 at 2013-10-23 16:35:34 -0400
Processing by PractitionersController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"u9XWBVshMKmLg+YhVFWu10PTQu+uvAbbvBck4QQG6wk=", "practitioner"=>{"first_name"=>"Christine", "last_name"=>"Campbell", "degree"=>"CRNP", "accepting_new_patients"=>"1", "specialty"=>"Obstetrics & Gynecology", "secondary_specialty"=>"", "c_v"=>"Undergraduate Education: 1988\r\nGraduate School Education: 1995\r\nAffiliations: Pottstown Memorial Hospital", "practice_ids"=>[nil, "1"]}, "commit"=>"Update Practitioner", "id"=>"1"}
Practitioner Load (0.2ms) SELECT "practitioners".* FROM "practitioners" WHERE "practitioners"."id" = ? ORDER BY "practitioners".last_name ASC, "practitioners".first_name ASC LIMIT 1 [["id", "1"]]
Unpermitted parameters: practice_ids

when I try to update. If I comment out the practitioner_params method, like this:

def practitioner_params
params.require(:practitioner).permit!#(:first_name, :last_name, :degree, :accepting_new_patients, :specialty, :secondary_specialty, :c_v, :practice_ids)
end

then the form works correctly (so it's not an HTML issue or anything basic like that) -- I am able to set and unset the practice ids.

Can anyone suggest how I can keep the strong_parameters from Rails 4 but use habtm like this?

Thanks,

Walter

[Walter Lee Davis]

Documenting this for posterity...

When declaring an array-shaped value in the strong parameters method, you must hint at its format, like this

:practice_ids => []

Once that's done, the whole thing Just Works™.

Can anyone point me to a definitive guide to the new strong parameters? I didn't see it in the Rails Guides anywhere.

Walter

>
> Thanks,
>
> Walter
>
> --
> You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-ta...@googlegroups.com.
> To post to this group, send email to rubyonra...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/83F1116C-AC7E-433E-AC0D-41EB01136190%40wdstudio.com.
> For more options, visit https://groups.google.com/groups/opt_out.

[tamouse mailing lists]

On Wed, Oct 23, 2013 at 6:18 PM, Walter Lee Davis <wa...@wdstudio.com> wrote:
> Can anyone point me to a definitive guide to the new strong parameters? I didn't see it in the Rails Guides anywhere.

Hard to say about "definitive", but this is my go-to:

http://edgeguides.rubyonrails.org/action_controller_overview.html#strong-parameters

I haven't delved into any of the updated texts for Rails 4 yet except
the Rails 4 In Action pre-publication version, and that still needs to
be updated for strong parameters. Soon, I hope.

[Walter Lee Davis]

Thanks so much!

Walter

>
> --
> You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-ta...@googlegroups.com.
> To post to this group, send email to rubyonra...@googlegroups.com.

> To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAHUC_t-LfgrVxF6jckZ_Pgs4NkPCbZ9ABQjsagX9NUYwKPsOCw%40mail.gmail.com.