Rails 4 build_association

Question

在我的 rails 4 应用程序中，我有一个 user 模型 has_one profile 模型也 belongs_to user 模型

这是我第一次使用嵌套资源，所以我有点迷失了这是怎么回事，用户创建一个帐户，成功通过电子邮件身份验证后，用户继续创建个人资料。问题是，我在使用 build_association 时遇到错误。我不确定问题是否真的出在这个问题上，还是我在参数上得到了空值（我认为不是）

在我的 routes.rb

resources :users do
   resources :profiles
end

个人资料视图，new.html.erb

<%= form_for(@profile,url:{ :controller => 'profiles', :action => 'create'},html: {class: "ui large segment form error"})  do |f| %>
    <%= render 'shared/form_error_messages', object: f.object%>
        <div class="ui horizontal divider">Create a Profile</div>
            <%= f.text_field :first_name, :placeholder => "First Name" , :required => true%>
<%= f.submit "Submit Profile", class: "ui submit button"%>
    <% end %>

profiles_controller.rb

def new
    @user = User.find(params[:user_id])
    @profile = @user.build_profile
end

def create
    @profile = @user.build_profile(profile_params)
    if @profile.save
        flash[:success] = "Profile has been created"
        redirect_to root_url
    else
        render 'new'
    end
end 

private
def profile_params
    params.require(:profile).permit(:first_name)
end

当我提交表单时，我得到

NoMethodError in ProfilesController#create
undefined method `build_profile' for nil:NilClass

Application Trace | Framework Trace | Full Trace
app/controllers/profiles_controller.rb:9:in `create'
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"MFCANYra..",
"profile"=>{"first_name"=>"sample",
"commit"=>"Submit Profile",
"user_id"=>"1"}

Answer 1

尝试更改 profiles_controller.rb 中的创建操作，如下所示：-

def create
  @user = User.find(params[:profile][:user_id])
  @profile = @user.build_profile(profile_params)
  if @profile.save
      flash[:success] = "Profile has been created"
      redirect_to root_url
  else
      render 'new'
  end
end

让我知道这是否有效，请尝试找出是否是其他原因导致的问题，谢谢。

Rails 4 build_association

Rails 4 build_association

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ruby-on-rails-4