如何创建嵌套的has_one关联？

Question

我有3个模型，并且我想创建一个用地址构建用户的表单。但是每次我尝试创建时，地址参数都为空。

这是有问题的代码：

user.rb

class User < ApplicationRecord
    has_one :email_user
    has_one :address
    accepts_nested_attributes_for :address
end

address.rb

class Address < ApplicationRecord
    belongs_to :user
end 

email_user.rb

class EmailUser < ApplicationRecord
    belongs_to :user
end

email_user_controller.rb

def new
    @email_user = EmailUser.new
    @email_user.build_user
end

def create
    @email_user = EmailUser.new(email_user_params)
    respond_to do |format|
        if @email_user.save
            if @email_user.build_user(user_params).save
                format.html { redirect_to "/admin/email_users"}               
            end
        else
            format.html { render :new }
            format.json { render json: @email_user.errors.full_messages, status: :unprocessable_entity }
        end
    end
end

def email_user_params
    params.require(:email_user).permit(:email_user_ids, :id, :password, :password_confirmation)
end

def user_params
    params.require(:user).permit(:user_ids, :id, :name, :email, address_attributes: [:id, :address, :address_city, :address_state])
end

email_users / form.html.erb

<%= form_for([:admin,@email_user]) do |e| %>
        <div class="row">
            <div class="col-md-8" style="margin: auto">
                <div class="card card-user">
                    <div class="card-header">
                        <h5 class="card-title">Users</h5>
                    </div>
                    <div class="card-body">
                        <form>
                            <%= fields_for :user do |f|%>
                                <div class="form-row">
                                    <div class="form-group col-md-6 required-field">
                                        <label>Name</label>
                                        <%= f.text_field :name, required:true, class:"form-control", placeholder: ""%>
                                    </div>
                                </div>
                                <div class="form-row">
                                    <div class="form-group col-md-12 required-field">
                                        <label>Email</label>
                                        <%= f.text_field :email, :required => true, class:"form-control", placeholder: "" %>
                                    </div>
                                </div>
                                <div class="form-row">
                                    <div class="form-group col-md-6 required-field">
                                        <label>Password</label>
                                        <%= e.password_field :password, :required => true, class:"form-control", placeholder: ""%>
                                    </div>
                                    <div class="form-group col-md-6 required-field">
                                        <label>Password Confirmation</label>
                                        <%= e.password_field :password_confirmation, :required => true, class:"form-control", placeholder: "" %>
                                    </div>
                                </div>

                                    <div class="form-row">
                                        <div class="form-group col-md-12">
                                            <label>Address</label>
                                            <%= f.text_field :address, class:"form-control", placeholder: ""%>
                                        </div>
                                    </div>
                                    <div class="form-row">
                                        <div class="form-group col-md-4">
                                            <label>Address State</label>
                                            <%= f.text_field :state, class:"form-control", placeholder: "" %>
                                        </div>
                                        <div class="form-group col-md-4">
                                            <label>City</label>
                                            <%= f.text_field :city, class:"form-control", placeholder: "" %>
                                        </div>
                                    </div>
                            <% end %>

                            <div class="form-row">
                                <div class="input-field update ml-auto mr-auto">
                                    <%= e.button :submit, class:"btn btn-primary btn-round" do %>
                                    <i class="fas fa-globe-americas"></i> Criar/Atualizar
                                    <% end %>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            <% end %>

有人知道怎么回事吗？