I have a model called TaxCategory, that has_many :tax_rates and accepts_nested_attributes_for :tax_rates, reject_if: :all_blank, allow_destroy: true.
TaxRates itself is a model, which, amongst other things, has_and_belongs_to_many :countries.
These relations work fine, and I am able to add and remove countries through the console.
However, I have a form for TaxCategory that contains fields_for :tax_rates do |g|.
Inside here, I have a
g.select :country_ids, Country.collect{|c| [c.name, c.id]}, {multiple: true}, {}
It submits to the tax_categories controller, which uses the following code to update the TaxCategory:
class TaxCategoriesController
before_action :set_tax_category, only: [:show, :edit, :update, :destroy]
...*snip*...
def update
respond_to do |format|
if @tax_category.update(tax_category_params)
format.html { redirect_to [:dashboard, @tax_category], notice: 'Tax Category was successfully updated.' }
format.json { render :show, status: :ok, location: @tax_category }
else
format.html { render :edit }
format.json { render json: @tax_category.errors, status: :unprocessable_entity }
end
end
private
def set_tax_category
@tax_category = TaxCategory.find(params[:id])
end
def tax_category_params
params.require(:tax_category).permit(:name, tax_rates_attributes:[:id, :rate,{country_ids: []}, :_destroy])
end
end
However, this does not work; When submitting the form, only the very first Country is saved, and the Rails command line shows the Unpermitted parameter: country_ids message.
I think this is a problem that is caused by the params.permit, but I do not understand what I am doing wrong.
What is going wrong, and how can I fix it?
UPDATE
I think I found the problem. Your sample params say country_ids: 1, in which it should instead be country_ids: [1] because it should have been an array / multiple values.
Update the following into:
g.select :country_ids, Country.collect{|c| [c.name, c.id]}, {}, {multiple: true}