rails嵌套属性不以形式显示。

Question

我在表单中添加了一个嵌套属性，嵌套属性的字段--即Education字段不呈现，其他字段则呈现。这些关系似乎是有序的，而控制器也是如此。

这是密码。

控制器

def new
  @profile = current_user.build_student_profile
end

def profile_params
  params.require(:student_profile).permit(:first_name, :last_name, :gender, student_profiles_attributes: [:degree, :university_id, :major, :major2, :start_date, :end_date, :grade, :grade_scale] )
end

模型

class Education < ActiveRecord::Base
  belongs_to :student_profile
  belongs_to :university
  validates :grade_scale, inclusion: { in: %w(GPA4 GPA7 WAM100) }
  validates :degree, :university_id, :major, :start_date, :end_date, :grade, :grade_scale, presence: true
end
class StudentProfile < ActiveRecord::Base
  belongs_to :user
  has_many :educations
  validates :gender, inclusion: { in: %w(male female) }
  validates :first_name, :last_name, :gender, presence: true
  accepts_nested_attributes_for :educations
end

表单

<%= form_for (@profile) do |f| %>
  <%= f.label :first_name %>
  <%= f.text_field :first_name %>
  <%= f.label :last_name %>
  <%= f.text_field :last_name %>
  <%= f.label :gender %>
  <%= f.text_field :gender %>
  <%= f.fields_for :educations do |education_fields| %>
  <%= education_fields.label :Degree %>
  <%= education_fields.text_field :degree %>
  <%= education_fields.label :University %>
  <%= education_fields.collection_select(:university_id, University.all, :id, :name) %>
  <%= education_fields.label :Major %>
  <%= education_fields.text_field :major %>
  <%= education_fields.label :Additional_Major %>
  <%= education_fields.text_field :major2 %>
  <%= education_fields.label :Start_Date %>
  <%= education_fields.date_field :start_date %>
  <%= education_fields.label :End_Date %>
  <%= education_fields.date_field :end_date %>
  <%= education_fields.label :Grade %>
  <%= education_fields.number_field :grade %>
  <%= education_fields.label :Grade_Scale %>
  <%= education_fields.select :grade_scale, [["GPA / 4","GPA4"], ["GPA / 7","GPA7"], ["WAM / 100","WAM100"]] %>
  <% end %>
  <%= f.submit :submit %>
<% end %>

我尝试将以下内容添加到控制器新动作@profile.educations.build中，但得到了一个错误未知属性student_profile_id

有人能帮忙吗？

Answer 1

确保student_profile_id属性/列存在于educations表中。

在此之后，正如您已经提到的，您需要在educations上构建student_profile对象，如下所示：

def new
  @profile = current_user.build_student_profile
  @profile.educations.build
end

Answer 2

尝尝这个

<%= f.fields_for(:educations,@profile.educations.build) do |education_fields| %> <% end %>

或

def new @profile = current_user.build_student_profile @educations = @profile.educations.build end

<%= f.fields_for(@educations) do |education_fields| %> <% end %>