Question

我必须在Rails中重建一个看起来像这样的表单：

您正在考虑的是能够获得多年级（或学年）的学生，并且对于每个年级（或学年），您可以添加评估。有三个评估（开始，中间和最后），每个评估将有一定数量的科目。我得到他们所在的学校可以获得的科目，以便更新/改变价值，但我只希望在学校里教授这些科目。用户不应该能够＆＃34;添加主题＆＃34; ...我想像你在上面看到的那样定义它们。

我的问题是，我该如何实现这一目标？我有它的工作，所以我可以向学生添加无限数量的成绩（或学年），但我无法弄清楚如何无缝地添加另一个按评估分类的嵌套表格，所有科目都预设根据每次评估。模型如下：

Class Student < ApplicationRecord

  belongs_to :school
  has_many :student_grades, inverse_of: :student, dependent: :destroy
  accepts_nested_attributes_for :student_grades, reject_if: :all_blank, allow_destroy: true

  validates :status, presence: true
  validates :school_id, presence: true
  validates :first_name, presence: true
  validates :middle_name, presence: false
  validates :last_name, presence: true

  enum :status => [:active, :applying, :graduated, :expelled]

end

class StudentGrade < ApplicationRecord

  belongs_to :student
  belongs_to :computer, optional: true
  has_many :student_grade_subject_assessments, inverse_of: :student_grade, dependent: :destroy
  accepts_nested_attributes_for :student_grade_subject_assessments, reject_if: :all_blank, allow_destroy: true

  validates :student_id, presence: true
  validates :school_year, presence: true
  validates :grade, presence: true
  validates :computer_id, presence: false

end

class StudentGradeSubjectAssessment < ApplicationRecord

  belongs_to :student_grade
  belongs_to :subject

  validates :student_grade_id, presence: true
  validates :subject_id, presence: true
  validates :assessment_type, presence: true
  validates :percentage, presence: false
  validates :comments, presence: false
  validates :plan, presence: false

  enum :assessment_type => [:beginning_assessment, :mid_term_assessment, :final_assessment]

end

_form.html.erb

<%= form_for(@student, html: { multipart: true }) do |f| %>

    <div class="tab-content">
      <div class="tab-pane active" id="student-profile">
        <div class="row">
          <div class="col-xs-12 col-sm-4">
            <div class="form-group">
              <%= f.label :last_name, 'Last Name' %><br>
              <%= f.text_field :last_name, class: 'form-control' %>
            </div>
          </div>
          <div class="col-xs-12 col-sm-4">
            <div class="form-group">
              <%= f.label :first_name, 'First Name' %><br>
              <%= f.text_field :first_name, class: 'form-control' %>
            </div>
          </div>
          <div class="col-xs-12 col-sm-4">
            <div class="form-group">
              <%= f.label :middle_name, 'Middle Name' %><br>
              <%= f.text_field :middle_name, class: 'form-control' %>
            </div>
          </div>
          <div class="col-xs-12 col-sm-4">
            <div class="form-group">
              <%= f.label :school_id %><br>
              <%= f.collection_select :school_id, School.all.order(:name), :id, :name, {prompt: "Choose..."}, {class: 'form-control'} %>
            </div>
          </div>
        </div>
      </div>
      <div class="tab-pane" id="grades">
        <%= f.fields_for :student_grades do |student_grade| %>
            <%= render 'student_grade_fields', :f => student_grade %>
        <% end %>
        <div class='links'>
          <%= link_to_add_association 'Add School Year', f, :student_grades, class: "btn btn-success" %>
        </div>
      </div>
    </div>

    <%= f.submit "Save Student", class: "btn btn-success" %>

<% end %>

_student_grade_fields.html.erb只包含相应模型的字段，但我也在为StudentGradeSubjectAssessment添加表单。

Answer 1

看起来你想要这样的东西：

@student.student_grades.each do |grade|
  ...year, grade, computer stuff for the grade

  grade.student_grade_subject_assessments.where(assessment_type: :beginning_assessment).each do |assessment|
    ...stuff for each beginning assessment per subject
  end

  grade.student_grade_subject_assessments.where(assessment_type: :middle_assessment).each do |assessment|
    ...stuff for each middle assessment per subject
  end

  grade.student_grade_subject_assessments.where(assessment_type: :end_assessment).each do |assessment|
    ...stuff for each final assessment per subject
  end
end

您还可以通过按评估类型对一个查询进行分组，为每种评估类型保存多个查询：

grade.student_grade_subject_assessments.group_by(:assessment_type)

这将产生一个散列，其中键是评估类型，值是该评估类型的所有主题的数组（已按等级确定范围）。这是一个doc的例子。

具有默认/设置值的多个嵌套表单

1 个答案: