Rails 3 - save few models with foreign keys in same time - ruby

Question

I have models User, Teacher, TeacherEducation. TeacherEducation belongs to Teacher, Teacher belongs to User.
I use nested attributes to save everything via one line in my controller user.save. But I met thing which I can't solve. I can set id for Teacher, but I can't give id for TeacherEducation before I can save Teacher.
Is it possible to fix that and keep using nested attributes in my models?
class User < ActiveRecord::Base
attr_accessor :password
attr_accessible :user_login,
:password,
:teacher_attributes
has_one :teacher
accepts_nested_attributes_for :teacher
end
class Teacher < ActiveRecord::Base
attr_accessible :teacher_last_name,
:teacher_first_name,
:teacher_middle_name,
:teacher_birthday,
:teacher_sex,
:teacher_category,
:teacher_education_attributes
belongs_to :user
has_one :teacher_education
accepts_nested_attributes_for :teacher_education
validates :user_id,
:presence => true
end
class TeacherEducation < ActiveRecord::Base
attr_accessible :teacher_education_university,
:teacher_education_year,
:teacher_education_graduation,
:teacher_education_speciality
belongs_to :teacher
validates :teacher_id,
:presence => true
...
end
My controller
class AdminsController < ApplicationController
def create_teacher
user = User.new( params[:user] )
user.user_role = "teacher"
user.teacher.user_id = current_user.id # Work
user.teacher.teacher_education.teacher_id = user.teacher.id # Doesn't work
if user.save
...
end
end
end
So, user.teacher.teacher_education.teacher_id = user.teacher.id doesn't work.
UPD
Error
Teacher teacher education teacher can't be blank, Teacher user can't be blank
View - new_teacher.html.erb
<%= form_for #user, :url => create_teacher_url, :html => {:class => "form-horizontal"} do |f| %>
<%= field_set_tag do %>
<%= f.fields_for :teacher do |builder| %>
<div class="control-group">
<%= builder.label :teacher_last_name, "Фамилия", :class => "control-label" %>
<div class="controls">
<%= builder.text_field :teacher_last_name, :value => #teacher_last_name %>
</div>
</div>
<div class="control-group">
<%= builder.label :teacher_first_name, "Имя", :class => "control-label" %>
<div class="controls">
<%= builder.text_field :teacher_first_name, :value => #teacher_first_name %>
</div>
</div>
<div class="control-group">
<%= builder.label :teacher_middle_name, "Отчество", :class => "control-label" %>
<div class="controls">
<%= builder.text_field :teacher_middle_name, :value => #teacher_middle_name %>
</div>
</div>
<div class="control-group">
<%= builder.label :teacher_sex, "Пол", :class => "control-label" %>
<div class="controls">
<%= label_tag nil, nil, :class => "radio" do %>
<%= builder.radio_button :teacher_sex, 'm', :checked => #user_sex_man %>
Мужской
<% end %>
<%= label_tag nil, nil, :class => "radio" do %>
<%= builder.radio_button :teacher_sex, 'w', :checked => #user_sex_woman %>
Женский
<% end %>
</div>
</div>
<div class="control-group">
<%= builder.label :teacher_birthday, "Дата рождения", :class => "control-label" %>
<div class="controls">
<%= builder.text_field :teacher_birthday, :value => #teacher_birthday %>
<p class="help-block">Формат даты: дд.мм.гггг</p>
</div>
</div>
<div class="control-group">
<%= builder.label :teacher_category, "Категория", :class => "control-label" %>
<div class="controls">
<%= builder.text_field :teacher_category, :value => #teacher_category %>
</div>
</div>
<%= builder.fields_for :teacher_education do |edu_fields| %>
<div class="control-group">
<%= edu_fields.label :teacher_education_university, "Название ВУЗа", :class => "control-label" %>
<div class="controls">
<%= edu_fields.text_field :teacher_education_university, :value => #teacher_university %>
</div>
</div>
<div class="control-group">
<%= edu_fields.label :teacher_education_year, "Дата выпуска из ВУЗа", :class => "control-label" %>
<div class="controls">
<%= edu_fields.text_field :teacher_education_year, :value => #teacher_finish_univ %>
<p class="help-block">Формат даты: дд.мм.гггг</p>
</div>
</div>
<div class="control-group">
<%= edu_fields.label :teacher_education_graduation, "Степень", :class => "control-label" %>
<div class="controls">
<%= edu_fields.text_field :teacher_education_graduation, :value => #teacher_graduation %>
</div>
</div>
<div class="control-group">
<%= edu_fields.label :teacher_education_speciality, "Специальность", :class => "control-label" %>
<div class="controls">
<%= edu_fields.text_field :teacher_education_speciality, :value => #teacher_specl %>
</div>
</div>
<% end %>
<% end %>
<hr/>
<div class="control-group">
<%= f.label :user_login, "Логин учетной записи", :class => "control-label" %>
<div class="controls">
<%= f.text_field :user_login, :value => #user_login %>
<%= link_to_function "Сгенерировать логин", "generate_login()", :class => "btn" %>
</div>
</div>
<div class="control-group">
<%= f.label :password, "Пароль учетной записи", :class => "control-label" %>
<div class="controls">
<%= f.text_field :password, :value => #user_password %>
<%= link_to_function "Сгенерировать пароль", "generate_password()", :class => "btn" %>
</div>
</div>
<% end %>
<%= f.submit "Создать", :class => "btn btn-large btn-success" %>
<% end %>
Also, some debug information:
user: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
password: somepass
teacher_attributes: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
teacher_birthday: 21.12.1990
teacher_category: categ
teacher_education_attributes: !ruby/hash:ActiveSupport::HashWithIndifferentAccess
teacher_education_graduation: grad
teacher_education_speciality: spec
teacher_education_university: univ
teacher_education_year: 28.09.2000
teacher_first_name: name
teacher_last_name: last
teacher_middle_name: middle
teacher_sex: w
user_login: schoolh_Lyp1v
utf8: ✓
controller: admins
My schema
create_table "teacher_educations", :force => true do |t|
t.integer "teacher_id"
t.string "teacher_education_university"
t.date "teacher_education_year"
t.string "teacher_education_graduation"
t.string "teacher_education_speciality"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "teacher_phones", :force => true do |t|
t.integer "teacher_id"
t.string "teacher_home_number"
t.string "teacher_mobile_number"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "teachers", :force => true do |t|
t.integer "user_id"
t.string "teacher_last_name"
t.string "teacher_first_name"
t.string "teacher_middle_name"
t.date "teacher_birthday"
t.string "teacher_sex"
t.string "teacher_category"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
create_table "users", :force => true do |t|
t.string "user_login"
t.string "user_role"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
t.string "encrypted_password"
t.string "salt"
end

Answer 1

If you are constructing your form properly to support the nested attributes then this is all you need:
user = User.new( params[:user] )
user.user_role = "teacher"
if user.save
...
end
The accepts_nested_attributes mechanics will take care of the rest. If the above doesn't work then lets look at how your form is put together.