Ruby on Rails

Documenting this for posterity...

On Oct 23, 2013, at 5:20 PM, Walter Lee Davis wrote:

> 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?

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
>
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