Doctor(…) expected, got ActionController::Parameters(…)?

Question

I am creating form which accepts nested attributes: #doctor.rb

#user.rb
  has_one :doctor
  accepts_nested_attributes_for :doctor, reject_if: proc { |attributes| attributes['cartridge_name'].blank? }, allow_destroy: true

my strong parameters:

def user_params
      params.require(:user).permit(:name,:birthday, :address, :phone,:email, :role, :social => [],
                    :doctor => [:position,:department_id,:salary_type,:date_came,:monthly_salary,:percentage_salary,:id],
end

But i got error:

Doctor(#70193541488440) expected, got ActionController::Parameters(#70193536484960)

Probably it is the problem with associations or with my strong params.

EDIT:

<%= form_for(@user, url:create_doctor_users_path) do |f| %>
  <%= f.fields_for @doctor do |u| %>
          <%= render 'doctor_attributes', f:u %>
  <% end %>
<% end %>      

EDIT2:

      Parameters: {"utf8"=>"✓", "authenticity_token"=>"birXhqxdplQMfZF5G8jDM9wi1nsBwkJfWsHcE8ZbPCxxemgR8ObmCFzODqoHAcTDo9jNMN0G0HK69A4hGy0Ddg==", 
"user"=>{"name"=>"", "birthday"=>"", "address"=>"", "phone"=>"", "email"=>"", 
"doctor"=>{"position"=>"", "department_id"=>"", "salary_type"=>"Зарплата", "date_came"=>"", "monthly_salary"=>"", "percentage_salary"=>""}, 
"educations_attributes"=>{"0"=>{"from"=>"", "to"=>"", "institution"=>"", "major"=>"", "_destroy"=>"false"}}, 
"job_experiences_attributes"=>{"0"=>{"from"=>"", "to"=>"", "institution"=>"", "position"=>"", "_destroy"=>"false"}}}, "commit"=>"Зарегестрировать"}

And also I think this is important, i am doing creation in controller this way:

@user = User.new
@doctor = Doctor.new
@user.job_experiences.build
@user.educations.build

I guess i should do:

@user.doctor.build

as with job_experiences, but i get error:

undefined method `build' for nil:NilClass

Answer 1

Fix your user_params to this:

def user_params
      params.require(:user).permit(:name,:birthday, :address, :phone,:email, :role, :social => [],
                    :doctor_attributes => [:position,:department_id,:salary_type,:date_came,:monthly_salary,:percentage_salary,:id]
                     ^^^^^^^^^^^^^^^^^
end

Explain: If you are using accepts_nested_attributes_for in the model, you should pass the permitted params as doctor_attributes not doctor , under the hood rails create an object Doctor as it described in your errors.

Read a wonderful article about accepts_nested_attributes_for .

Update:

Fix your form to:

  <%= f.fields_for :doctor, @user.build_doctor do |u| %>
       <%= render 'doctor_attributes', f:u %>
  <% end %>

when in your parameters you should see:

"doctor_attributes"=>{" ....}

instead of:

"doctor"=>{" ....}