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I want to access usr_additional_users_attributes in the following params? how can i do that ?

 params.require(:usr_contact).permit(:first_name, :last_name, :dob, :gender,
                                    :mobile, :email, :password,
                                    :password_confirmation,
                                    :image,
                                    usr_contact_vendors_attributes:
                                        [:id, usr_vendor_property_attributes:
                                            [:shop_name, :specified_area, :mobile, :website,
                                             usr_vendor_branches_attributes:
                                                 [:address_line1, :address_line2, :city ,:zip_code ],
                                             usr_additional_users_attributes:[:id,:email,:role, :_destroy]]] )

end

I want to get it like this in my controller and put emails to an array. this one showing an error

 params[:usr_contact][:usr_contact_vendors_attributes][:usr_vendor_property_attributes][:usr_additional_users_attributes].values.each do |item|
      @emailSet << item[:email]
    end

undefined method `[]' for nil:NilClass

any suggestions ?

Chanaka
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  • I would say, go step by step to check `params[:usr_contact]`, then `params[:usr_contact][:usr_contact_vendors_attributes]`, and so on. One of these is `nil`. – Jagdeep Singh May 03 '17 at 08:34

4 Answers4

2

You would have to use dig because when you're trying to access one of these params, they're null, so Ruby raise this exception. By using dig, it's like it's checking every attribute before you're accessing it. It would be good to check inside the item too with item[:email].present?

Your code would look like:

 params.dig(:usr_contact, :usr_contact_vendors_attributes, :usr_vendor_property_attributes, :usr_additional_users_attributes).values.each do |item|
   @emailSet << item[:email] if item[:email].present?
 end
Community
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diofeher
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0

I have an example of how I did it in my scenario:

def patient_params
    params.require(:patient).permit(*permited_patient_attributes)
  end

  def permited_patient_attributes
    [
      :user_id,
      :start,
      patient_demographic_attributes: [
        :id,
        :patient_id,
        :start_date,
        :end_date,
        :first_name,
        :middle_name,
        :last_name,
        :date_of_birth,
        :gender,
        :ethnicity,
        :marital_status],
      patient_contact_attributes: [
        :id,
        :patient_id,
        :street_address,
        :extended_address,
        :locality,
        :region,
        :postal_code,
        :country],
      patient_email_attributes: [
        :id,
        :email],
      patient_mrn_attributes: [
        :id,
        :patient_id,
        :mrn],
      contact_telephones_attributes: [
        :id,
        :party_type,
        :party_id,
        :name,
        :number,
        :_destroy],
      patient_physicians_attributes: [
        :id,
        :patient_id,
        physician_id: []]
    ]
  end

Here patient_demographic_attributes, patient_contact_attributes. are nested one.Have a try

Chetan Mehta
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You need to make sure that your item is not nil before pushing it to your array. Easiest way is to do this is by adding a check if item is nil.

@emailSet << item[:email] unless item.nil?
omarshariffd
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0

I fixed it by printing params. It was something like this 

{"0"=>{"usr_vendor_property_attributes"=>{"shop_name"=>"cbhcvbcvb", "specified_area"=>"cbcvbcb", "website"=>"bcbc@gmail.com", "mobile"=>"3543243", "usr_vendor_branches_attributes"=>{"1493800739760"=>{"address_line1"=>"", "address_line2"=>"", "city"=>"", "zip_code"=>""}}, "usr_additional_users_attributes"=>{"1493800739774"=>{"email"=>"sdgdfgd", "role"=>"Role1", "_destroy"=>"false"}}}}} permitted: false>

I have miss that ["0"], that was the issue. Then params can access in the controller like this.

 @test = params[:usr_contact][:usr_contact_vendors_attributes]["0"][:usr_vendor_property_attributes][:usr_additional_users_attributes]

Thanks for helping :D

Chanaka
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