Question

I have these three models.

Student.
Evaluation.
Grade (student_id, evaluatioin_id, value)

I want to make a form so that a User can set the grade for each student of a evaluation…

I want to keep this is as clean as possible (and restful)…

Im open to any suggestions on how to get this done.

Please Help.

Answer 1

What I ended up doing was..

In Grade Model

scope :for_student,lambda{|student, evaluation| where("student_id"=>student.id).where("evaluation_id"=>evaluation.id)}

In EvaluationsController

def assign_grades])
    @evaluation = Evaluation.find(params[:id])
    @students = Student.all  
    @students.each do |s|
      grade = Grade.for_student(s,@evaluation)
      if !grade.exists?  
       @evaluation.grades.build(:value=> 0,:student_id=>s.id)       
      end   
    end
  end

  def save_grades
    @evaluation = Evaluation.find(params[:id])
    @evaluation.update_attributes(params[:evaluation])

    redirect_to [@evaluation.batch_subject, @evaluation]

  end

In View

<table class="medium">      
<thead>
   <tr>
   <th>name</th>
   <th>Grade</th>
   </tr>
</thead>
<tbody>
   <%=f.fields_for :grades do |g|%>
    <tr>
      <td><%=g.label :value,g.object.student.full_name%> <%= g.hidden_field :student_id%></td>
<td><%=g.text_field :value%></td>
</tr>
<%end%>
</tbody>
</table>