关于使用“nested_form”gem的未定义方法“reflect_on_association”。 Rails 5

Question

在我的项目中，我有API及其相关的前端部分。我正在使用rails版本5。我正在创建两个模型。一个是用户，另一个是资格。协会如下。

class User 
    include Her::Model 
    include Her::FileUpload 
    has_file_upload :image_url 

    has_many :videos 
    has_many :qualifications 
    attributes :name, :email, :phone, :image_url, :contact_email, :about, :password, :password_confirmation 

    custom_post :sign_in, :refresh 
    custom_get :me 

    accepts_nested_attributes_for :qualifications 
end 

而且，资质模型是

class Qualification 
    include Her::Model 

    belongs_to :user 
    attributes :school, :degree, :grade, :start_year, :end_year 
end 

我的用户控制器强params为

def user_params 
     user: params.require(:user).permit(:id, :name, :email, :phone, :contact_email, :about,:image_url, 
     {specialization_ids: []}, 
     qualifications_attributes: [:id, :school, :degree, :grade, :start_year, :end_year, :_destroy] 
    end 

我的用户表单，在那里我已经提供nested_form是

<div class="row"> 
    <div class="container"> 
    <div class="signup-bg col-md-12"> 
     <h3 style="color:white;"> General Info </h3> 
     <hr> 
     <%= simple_nested_form_for @user do |f| %> 
      <%= f.input :email, input_html: {class: "input-user-form"} %> 
      <%= f.input :name, input_html: {class: "input-user-form"} %> 
      <%= f.input :phone , input_html: {class: "input-user-form"}%> 
      <%= f.input :contact_email, input_html: {class: "input-user-form"} %> 
      <%= f.input :about, as: :text, input_html: {class: "input-user-form"}%> 
      <label class="control-label">Selected Specializations</label> 
      <ul class="list-group"> 
      <% @user.specializations.each do |sp| %> 
       <li class="list-group-item tags"> 
       <%= check_box_tag "user[specialization_ids][]", sp["id"], true%> 
       <%= sp["name"] %> 
       </li> 
      <% end %> 
      </ul> 
     <h4 style="color:white;"><center>Select Your Specializations</center></h4> 
     <div class="row"> 
      <div class="col-md-12"> 
      <div class="input-group"> 
       <input id="searchText" type="text" class="input-signup" placeholder="Search Specialization" style="z-index:0;"> 
       <span class="input-group-btn"> 
        <button class="btn btn-default btn-go" type="button">Go!</button> 
       </span> 
       </div> 
      <div class="col-md-12 col-sm-12 col-lg-12" id="specializationHolder" style="min-height:85px;"></div> 
      </div> 
     </div> 
     <h3 style="color:white;"> Qualification Info </h3> 
     <hr> 
     <div id="qualification_holder"> 
      <%= f.simple_fields_for :qualifications, @qualification do |g| %> 
      <%= g.input :school,input_html: {class: "input-user-form"} %> 
      <%= g.input :degree, input_html: {class: "input-user-form"} %> 
      <%= g.input :grade, as: :integer, input_html: {class: "input-user-form"} %> 
      <%= g.input :start_year, required: false, as: :string, input_html: {type: :date, class: "datepicker input-user-form"} %> 
      <%= g.input :end_year, required: false, as: :string, input_html: {type: :date, class: "datepicker input-user-form"} %> 
      <% end %> 
     </div> 
     </br> 
     <div class="col-md-4"> 
      <%= f.link_to_add :qualifications, data: {target: "#qualification_holder"}, class: "btn-signup-submit" do %> 
      <b> + </b> Add Qualifications 
      <% end %> 
     </div> 
     <div id="wrapper"> 
      <label class="control-label file optional" for="user_image_url">Profile Picture</label> 
      <input class="file optional" type="file" name="user[image_url]" id="fileUpload"> 
     </div> 
     <div class="form-group text-center"> 
      <button type="submit" class="btn-signup-submit">Save Changes</button> 
     </div> 
     <% end %> 
    </div> 
    </div> 
</div> 

但是，我收到一个错误未定义的错误“reflect_on_association”，指向“link_to_add”。我在这里呆了一周。有没有解决方案..如果是这样，请帮助我。

在此先感谢。

Answer 1

我有同样的错误。解决方案是在有问题的关联上添加class_name选项，而不在类名上嵌套。

在你的情况，你可以尝试：

class User 
    include Her::Model 
    include Her::FileUpload 
    has_file_upload :image_url 

    has_many :videos 
    has_many :qualifications, class_name: "::Qualification" 
    attributes :name, :email, :phone, :image_url, :contact_email, :about, :password, :password_confirmation 

    custom_post :sign_in, :refresh 
    custom_get :me 

    accepts_nested_attributes_for :qualifications 
end